Fig 4 - uploaded by Cristian-Andi Nicolae
Content may be subject to copyright.
Source publication
This paper presents the maleinization study of linear styrene-butadiene block-copolymers carried out in solution by radical mechanism. The vinyl microstructure effect of the polybutadiene block on the kinetics reaction was established and the physical and mechanical properties were correlated with the maleinization degree of the elastomers.
Citations
... According to the FT/IR peak, only slipper fragments showed the typical EVA spectrum (Adelnia et al., 2015;Jaunich et al., 2016). Compared to previous studies, the soles of trekking shoes showed a similar trend as styrene-butadiene-styrene rubber (Baeta et al., 2009;Iancu et al., 2013;Luna et al., 2020). The sole fragments of running shoes and sneakers showed FT/IR spectra that were similar, not entirely same, to those of nitrile butadiene rubbers. ...
This study investigated the toxic effects of leachates from microplastic fragments of soles from four different types of shoes (slippers, trekking shoes, running shoes, and sneakers) on three aquatic organisms (Chlamydomonas reinhardtii, Daphnia magna, and Danio rerio). The chemical components in each leachate were identified; furthermore, chlorophyll a contents of C. reinhardtii were measured, and immobilization of D. magna and deformities in D. rerio were observed. The abnormalities observed in the test species exposed to the leachates were compared and chemical compounds majorly influencing the species were determined by principal component analysis (PCA). Sneaker leachate showed growth inhibitions in C. reinhardtii, immobility and mortality in D. magna, and severe abnormalities in D. rerio. Consequently, aquatic toxicity was majorly associated with benzothiazole, carbon disulfide, ethyl acetate, and p-xylene. The results showed that toxic chemicals could leach from load-originated microplastics when exposed to aquatic media, and consequently, induce significant negative effects on aquatic organisms. Since microplastics from shoe soles discharge the above-mentioned toxic chemicals, regulating the chemical use during plastic production is critical to prevent severe effects of microplastic toxicity in aquatic organisms, and to maintain the health of aquatic environments.
The paper presents a study about obtaining materials with prolonged biocidal effect based on styrenebutadiene block-copolymers (SBS) grafted with methacrylic acid (ACM) and coupled with antibiotics from the ampicillin group. The IR spectroscopy and the elemental analysis were used to confirm the structure of SBS block-copolymers grafted with methacrylic acid and of the medical ones. The content of grafted methacrylic acid was about 18.8 % in accordance with the 1,2 enchained butadiene content, proving that the methacrylation polymer-analogous reaction takes place at these pendant vinyl groups of the polybutadiene chain. The concentration of the methacrylic acid-ampicillin pendant group is about 38 % and corresponds to the theoretical calculated one. The antibacterial testing of the synthesized polymers showed that the final reaction product has a relatively high biocidal activity on gram-positive and gram-negative microorganisms.
This article presents the process of obtaining ionic thermoplastic elastomers based on maleinized styrene-butadiene block-copolymers (SBS-g-AM) by melt mixing. The following were studied influence of the amount of maleic anhydride, mixing time and degree of neutralization on physico-mechanical properties of blends based on SBS-g-AM rubber. © 2014 Universitatea Babes-Bolyai, Catedra de Filosofie Sistematica. All rights reserved.
