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![FTIR spectrum of 1,1-bis[4-(4-benzaldehyde oxy)-3-methyl phenyl] cyclopentane (BBMPC).](profile/Dr-Yuvraj-Patil/publication/316530726/figure/fig2/AS:655112246681600@1533202339010/FTIR-spectrum-of-1-1-bis4-4-benzaldehyde-oxy-3-methyl-phenyl-cyclopentane-BBMPC.png)
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A new dialdehyde 1,1-bis[4-(4-benzaldehyde oxy)-3-methyl phenyl] cyclopentane (BBMPC) was synthesized starting from cyclopentanone and O-cresol to give 1,1-bis(4-hydroxy-3-methyl phenyl)cyclopentane (BHMPC); followed by reaction with 4-fluorobenzaldehyde in N, N-dimethyl formamide (DMF), containing anhydrous potassium carbonate. New series of poly(...
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... ppm range due to aromatic protons. 41 Sharp upfield singlets appearing at 2.809 and 2.965 correspond to protons of two methyl (-CH 3 ) groups 42 attached to the benzene ring of the antibacterial agent incorporated into the dye molecule (Fig. 5). It was observed from the spectrum that 2 doublets were observed, i.e., one doublet for the methyl protons at 2.808 and 2.965, and one doublet for the amine protons at 9.050 and 9.135. ...
Bioactive textiles garnered considerable attention during the COVID-19 pandemic owing to their
antimicrobial properties. However, the fabrication and utilization of bioactive textiles have had a toxic
impact on the environment due to the leaching of bioactive agents during laundering. In this study, a
novel functional bioactive reactive dye was synthesized using an antibacterial agent covalently linked to
a triazine reactive group for the simultaneous dyeing and finishing of cotton fabric. The molecular
structure of the synthesized dye was characterized using FTIR, 1
H-NMR, 13C-NMR, MS, and UV-vis
spectroscopy. The dye was applied to the cotton fabric using the exhaust dyeing method. The
antibacterial efficacy of the powder dye and dyed fabric against Staphylococcus aureus and Escherichia
coli was estimated according to standard test protocols. The color strength (K/S), colorimetric data
(L*, a*, b*, C*, H*) measurement, ultraviolet protection, and colorfastness properties of the dyed fabric
were also evaluated. The synthesized powder dye revealed an outstanding antibacterial activity and killed
99.99% of bacteria (E. coli and S. aureus). The dyed fabric showed excellent antibacterial activity before
washing as well as after 20 industrial laundry cycles and showed that there was no significant reduction
in antibacterial activity, establishing non-leaching of the antibacterial agent into the environment. The
dyed fabrics before and after washing showed excellent ultraviolet protection values (450), better dye
fixation, and fastness properties. The current study has established a sustainable process to develop
bioactive textiles that do not leach bioactive agent into the environment.
... Nowadays, polymer composites play an essential role in human life. The new applications of these materials in energy storage and environmental applications are the focus of current scientists' researches [15][16][17][18][19][20]. Extensive research has been carried out on their applications in manufacturing of batteries, solar cells, and air and water purifiers [21][22][23][24][25][26][27][28]. ...
In the present study, polyamide 6@polyaniline-reduced graphene oxide (PA6@PANI-rGO) core shell nanofibrous composite was prepared by exploiting several fabrication techniques. Firstly, PA6 nanofibers (the core) were produced via electrospinning method. Then, aniline monomers were polymerized on the surface of the PA6 nanofibers via in situ polymerization method, leading to PA6@PANI nanofibers. In the next step, PA6@PANI-GO was prepared by immersing PA6@PANI into a GO suspension. Finally, PA6@PANI-GO was reduced by hydrazine to achieve PA6@PANI-rGO. The final product was then characterized via field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), N2-adsorption–desoption method, tensile testing and water contact angle (WCA) analysis techniques. FTIR analysis demonstrated the successful synthesis of PA6@PANI-rGO, due to the existence of the PA6, PANI and rGO characteristic peaks in the final product spectrum. Furthermore, FESEM and TEM images showed the successful coating of rGO on the surface of the PA6@PANI nanofibers. In addition, PA6@PANI-rGO nanofibers exhibited improved hydrophilicity, lower WCA (40°) and higher porosity compared to the pristine PA6. A comparison of the tensile stress and thermal degradation of PA6 and PA6@PANI-rGO nanofibers exhibited that the existence of PANI and rGO coatings on the surface of PA6 improved the mechanical properties and thermal stability of the coated nanofibers of about 31% and 25%, respectively. Chromium (VI) removal studies for PA6@PANI-rGO showed its bright future in heavy metal elimination from the wastewater.
... ppm range attributes to the presence of aromatic protons [28]. The other sharp up-field singlet at 1.83 ppm corresponds to the methyl (-CH 3 ) group attached with benzene ring of the chloroxylenol [29]. ...
Due to the focus on the development of environment-friendly and hygienic textiles, a novel and sustainable approach was adopted to functionalize acid dye for cotton dyeing to develop durable antibacterial and ultraviolet protective fabric. Functionalization of commercial acid dye was carried out by incorporation of triazine reactive system and antibacterial agent (chloroxylenol) into dye structure. The modified bioactive reactive dye was characterized by ¹H NMR, ¹³C NMR, FTIR, and UV–Vis spectroscopy. The exhaust dyeing approach was used for the application of dye on cotton. Antibacterial efficacy of modified dye powder and dyed fabric against Escherichia coli and Staphylococcus aureus was evaluated quantitatively and qualitatively following standard testing protocols. Fastness properties, levelness of dye, colorimetric data (L*, C* a*, b*, H*), and color strength (K/S) of dyed cotton fabric were also assessed. The dye exhibited remarkable antibacterial potential with 99.9% bacterial growth reduction with nearly the same results after 20 industrial laundering cycles. Ultraviolet Protection Factor (UPF) of dyed unwashed and washed fabric, measured according to standard AATCC-183, was >100. The dyed fabric showed good durability to light, washing, and rubbing fastness. The excellent antibacterial potential and remarkable durability to washing is due to the incorporation of chloroxylenol and triazine reactive system in acid dye structure. Thus, the development of such functional reactive dyes with durable antibacterial activity will be fruitful in the future in terms of sustainability for desired applications. Moreover, all commercially available acid dyes can be made reactive for functional dyeing of cotton by adopting this route.
... Almost all the signals that corresponded to the TPGS- PDMAEMA-b-PVBA block copolymer were overlapped with the TPGS-PDMAEMA copolymer. Whereas, the stretching vibration bands of the aldehyde (CHO) pending groups could be detected at 2690 and 1685 cm − 1 confirming the formation of PVBA in the second block [32]. Consequently, all FTIR results validated that the block copolymer was successfully synthesized (Fig. 2). ...
Herein, a series of vitamin E-based TPGS-poly(2-(dimethylamino)ethyl methacrylate)-b-poly(3-vinyl benzaldehyde) block copolymer micelles were synthesized via reversible addition−fragmentation chain-transfer polymerization (RAFT). d-α-tocopheryl poly(ethylene glycol) 1000 succinate (TPGS) is a good candidate to overcome the big problem of multidrug resistance in cancer therapy because TPGS can inhibit permeability of glycoprotein (P-gp) resulting in restored sensitivity to chemotherapeutics. Doxorubicin (DOX) was loaded within the micelles, as an anticancer model drug, via hydrolytic amide linkage in the hydrophobic block. The DOX-loaded micelles demonstrated high potential as anticancer drug delivery systems through the release of the drug under acidic conditions, varying from pH 7.4 to 5.0. Three different micelles compositions were investigated with various ratios of hydrophilic and hydrophobic blocks (1:1, 4:3, and 4:1). The DOX-conjugated polymer with the shortest hydrophobic segment (4:1), TPGS-poly(2-(dimethylamino)ethyl methacrylate)125-b-poly(3-vinyl benzaldehyde)91, demonstrated excellent in vitro cytotoxicity with pH-responsive characteristics in comparison to free DOX. Although the higher degree of polymerization of the hydrophobic block promoted the drug loading efficiency of the micelles these compositions demonstrated lower cytotoxicity to the A549 cell line of human lung adenocarcinoma. It was concluded that the prepared pH-responsive micelles based on TPGS are promising drug carriers for anticancer drug delivery systems and could be considered to provide multi-drug resistance cancer treatments after further in vitro biological studies.
... Additionally, in terms of changing the crystal structures of semi-aromatic polyamide, alicyclic was introduced into the molecular chain of semi-aromatic polyamide by Yan et al. (T g = 217.2-236.9 °C) [12], azo units by Huang et al. [13], triazole units by Ivanysenko [21,22] or aliphatic linkages [9] into semi-aromatic polyamides is also thought to be an effective method to yield high performance in our previous study. The obtained semi-aromatic polyamides are found to have good thermal properties, mechanical strength, solubility and rheological properties. ...
Through synthesizing novel difluoro-monomer (1,6-N,N’-bis(4-fuorobenzamide) trimethylhexane (BFBT)) and adjusting the structure of bisphenol monomer (hydroquinone (HQ) or 4,4’-biphenol (BH)), two kinds of novel semi-aromatic polyamides (HQ-BBT and BH-BBT) containing ether bond and pendant methyl were synthesized in this work. The inherent viscosities of these obtained polymers were in the range of 0.921–1.151 dLg−1. The polyamides HQ-BBT and BH-BBT exhibited high glass transition temperatures (Tg) of 144–160 °C and weight loss temperature (T5%) of 401–406 °C. The resultant polyamides HQ-BBT and BH-BBT showed good melting flowability with complex viscosities of 1931–252 Pa s and 3829–376 Pa s, respectively, and they can be hot-pressed into thin films, which showed tensile strengths of 64.4–64.6 MPa and storage modulus over 1.28 GPa at about 150 °C, indicating their good thermal and mechanical properties. Interestingly, we found that the aggregation structures of these two kinds of polymers were quite different with the addition of different bisphenol. HQ-BBT with HQ as monomer was amorphous and can be dissolved in polar solvents such as NMP, DMF and so on, while BH-BBT with BH as monomer was found to be crystalline polymer with moderate melting point of 245 °C and much higher glass transition temperature of 160 °C. These moderate Tm and Tg were very beneficial for the melting processing of the high-performance polymers.
... As presented in Scheme 2, a series of five new PAMs was prepared from new diamine precursor, i.e. 2,5-bis(4-(2-aminothiazole) phenyl)-3,4-diphenyl thiophene (TPTPThDA) with two different dialdehydes (IPA and TPA or varying mole ratio of IPA + TPA) by a high-temperature solution polycondensation method [33]. Yields and inherent viscosities are shown in Table 1. ...
... proceeded to produce with great molecular framework of PAMs. The stretching absorption at 1622 cm −1 is attributable to aromatic -C=C-stretching frequency of tetraphenylthiophene-thiazole unit which is well-constructed in polyazomethine [33]. The stretching at 3050 cm −1 explains the aromatic C-H moiety of the polyazomethines chain. ...
... In addition, these polymers remained 58-65% and 10-27% of original weight at 900 °C in nitrogen and air atmosphere, respectively [31,[43][44][45]. Amongst these polyazomethines, the PAM-02 presented uppermost thermal stability with T 10% ca.601 °C in compliance with the previous reports [33,36]. Polyazomethines composed of rigid backbone, i.e. para orientated (1,4 linkages, TPA) shows higher thermal stability than the meta orientated (1,3 linkages, IPA).This varying composition of polyazomethines (PAM-01 to PAAM-05) is also clearly seen in the residual weight at 900 °C [46,47]. ...
2,5-Bis(4-(2-aminothiazole) phenyl)-3 and 4-diphenyltetraphenyl thiophene (TPTPThDA) are fine processed in three steps. A series of polyazomethines containing thiophene–thiazole unit have been incorporated by the polycondensation of a new diamine, i.e. TPTPThDA, with proportionate of aromatic dialdehydes. The impact of insertion of thiazole entity in the polyazomethine matrix with the azo linkages having dialdehydes [isophthalaldehyde (1,3 IPA) and terephthalaldehyde (1,4 TPA)], on conductivity and gas sensing properties, has been studied. In all polyazomethines synthesized (PAM-01 to PAM-05), the preeminent in terms of conductivity and gas sensing properties has been established to be the PAM-03 containing polyazomethine matrix composition of 1,3 IPA and 1,4 TPA with thiophene–thiazole unit. After the infusion with the dialdehyde comonomers, an inflation of the molecular weight and the polyazomethines films were highly selective towards H2S gas at 35 °C with great sensitivity and acceptable selectivity. Along this, all polyazomethines have Tg in the range of 257–260 °C and T10% value of all thermally stable polyazomethines in air and nitrogen was in between of 458–545 °C and 527–601 °C, respectively. The polymer backbone contains rigid framework expect PAM-05, and due to this, they show less solubility in organic solvents. XRD study confirms that all the polyazomethines are amorphous in nature having broad peak in the range of 20°. The UV at 342 nm shows that there is a formation of imine (–C=N–) linkages in the polymer matrix which is helpful for the conduction of electron throughout. The band gap energy of PAM-3 is found as 3.63 eV.
... The band within 1595-1590 cm -1 was assigned for υ C=C aromatic rings and the band within 1233-1257 cm -1 for υ C-O-C of etheric bond (supplementary Fig. S3-S5), similar assignments have been reported in the literature for dicarbonyl monomers. 36,37 The polymers PmHOBND and PoHONPD showed weak band at 1694 and 1683 cm -1 respectively for υ C=O contributed from end on group, this band was present as a strong band in their corresponding monomers which showed that carbonyl group was converted into imine group. All the three polymers (PmHOBND, PoHONPD and PoHOAND) showed strong to medium intensity band within 1594-1620 cm -1 for υ C=N and the band within 1592-1518 cm -1 due to aromatic rings of the polymers. ...
Three new aliphatic-aromatic polymers having naphthyl rings were prepared by the polycondenstion of dialdehydes or diketone monomers with 1,5-naphthalenediamine or 1,4-phenylenediamine. The monomers were prepared by the reaction of aromatic aldehyde or ketone with 1,6-dibromohexane. The molecular mass of the monomers was confirmed through E.I mass spectroscopy. The structures of monomers and polymers were characterized by 1HNMR, FT-IR, UV-Vis Spectroscopy, SEM and TG/DTA. Fluorescence emissions of monomers and polymers were recorded and their quantum yields were calculated, all the compounds showed fluorescence property and indicated violet, blue-green, or- ange and red light emissions. The quantum yields of the polymers were obtained within the range of 0.04 to 24.3%. The semicrystalline and amorphous nature of the polymers was analyzed through powdered X-ray diffraction. Antimicrobial activities of the polymers were examined against different bacterial and fungal species. Thin film forming ability of the synthesized polymers was evaluated by making their blends with PVC (poly vinyl chloride) in different w/w% ratios.
Keywords: Polyimines; fluorescence; thermal stability; thin films; morphology
... There are an enormous number of publications, ranging from pure synthetic work to modern physicochemical and biochemically relevant studies of metal complexes. [1][2][3] Various properties of Schiff base polymers, such as the ability to coordinate with many metals, [4][5][6][7][8][9] heat stability, [10,11] catalysis, [12][13][14][15] specific separation, [16,17] metal ion enrichment, [18] semiconductor, [19] antimicrobial agent [20][21][22][23][24][25][26] and anticarcinogen, [27,28] have been reported. Synthesis, characterization and thermal behaviors of methacrylate homo and copolymers carrying a Schiff base group in the side chain, and antimicrobial properties against various species of bacteria, fungi and yeast, have been studied. ...
Its nickel complex and a polyacrylate with side chain the Schiff base obtained from the condensation reaction of 4-hydroxybenzaldehide and p-toluidine, have been synthesized. The three-component composites were prepared using the polyacrylate, poly[4-((p-tolylimino) methyl) phenyl acrylate], its Ni-complex, and aminated MWCNT at three different percent (2%, 8% and 15% by wt). For characterization, FT-IR, 1H-NMR, SEM-EDX, SEM images and VSM (vibrating sample magnetometer) were used. The specific magnetic susceptibility for the Ni-complex is calculated as 3.0 × 10⁻⁸ m³/kg from the slope of VSM straight line and the Ni-complex shows paramagnetic property. Thermal stabilities of the composites decreased compared with the polymer and Ni-complex. The AC conductivities of the samples increased with increasing frequency and increasing temperature. Frequency exponent of the equation connecting the AC conductivity to angular frequency was calculated as between 1.06 and 0.86 at 298 K and between 0.97 and 0.71 at 320 K, for all samples. Log σac vs 1000/T straight lines were generated above and below the Tg temperature and the activation energies were calculated from the slopes as the values between 0.097 and 0.331 eV below Tg and the values between 1.134 and 0.768 eV above Tg.
... Numerous investigations were devoted to the creation of new functional materials with the complex of predictable properties in recent years. Among them, new materials based on aromatic azomethines, which possess semiconductor properties [1], thermal stability [2], thermotropic potential and the ability to form organometallic complexes [3] can be listed. Azomethines are of interest also due to their photo-and thermochromic properties, both in the solid state and in solutions [4]. ...
Quantum-chemical calculations of the E,E-, E,Z- and Z,Z-isomers structure of model bis-azomethines by the semiempirical PM3 method and the time-dependent theory of the density functional (DFT) are performed. It is shown that a completely satisfactory agreement between the theory and experiment is achieved using the B3LYP/cc-pVDZ calculation level and the INDO/S method for calculating the absorption spectra of the new bis-azomethines. The values of polarizability, first and second hyperpolarizability of model compounds are calculated. The used approach allows to make the screening of the most promising bis-azomethines for nonlinear optics applications.
... This amorphous nature of all these poly(amide-imide)s supported to solubility and inherent viscosity of polymers. [25][26] ...
The main objective of this research was to study the structure–property relationships to high performance polymers with thermal stability, solubility and viscosity. Hence, a series of novel poly(amide-imide)s (PAIs) was synthesized from a tetraphenylthiophene-thiazole containing diimide-diacid(TPTPThDIDA) monomer with commercially available various aromatic diamines by using Yamazaki’s direct phosphorylation reaction. The resulting PAIs were obtained in high yields and inherent viscosities in the range of 0.86–0.96 dL/g. The reinforcement of the heterocyclic thiazole ring unit on the properties of these PAIs was studied by comparison of the corresponding polymers containing tetraphenylthiophene groups. The PAIs exhibited excellent solubility and good thermal stability. PAIs showed high glass-transition temperatures in the range of 267 °C–302 °C. Thermogravimetric analysis of the PAIs indicated a 10% weight loss (T10) in the temperature range of 609–736 °C and char yields at 900 °C under nitrogen atmosphere in the range of 73–80% depending on the diamine monomer used for the synthesis PAIs. The LOI of all poly(amide-imide)s were more than 29, thus such type polymers of can act as flame-retardant materials.
