Wenhua xu

Shanghai Jiao Tong University | SJTU · Department of Chemistry

The combination of continuous-flow microreactors and photoreaction is one of the important researches in flow chemistry. Dimethyl-substituted cyclobutanetetracarboxylic dianhydride (DM-CBDA) was prepared through photodimerization in photomicroreactors and applied in the preparation of polyimide films. It was found that ethyl acetate as the solvent...

Preparation method is of importance for development and application of polymers. Herein, we proposed a continuous-flow strategy for the preparation of polyimide precursors through solution polymerization in microreactors for the first time. The polymerization time was significantly reduced from several hours in a batch reactor to twenty minutes in...

The development of optical films is highly desirable for applications in flexible displayers. In this work, a copolyimide (co‐PI) film with high thermal stability and high transparency was prepared by the copolymerization of 2,2′‐bis(trifluoromethyl)‐4,4′‐diaminodiphenyl ether, cyclobutanetetracarboxylic dianhydride, and 4,4′‐(hexafluoroisopropylid...

The authors regret that there were some errors in the article. The corrections are listed as follows: 1. Eq. 12 in the article should be written as follows: [Formula presented] In previous version, it was written as [Formula presented] 2. Fig. 14 (A) in the article should be corrected as Fig. C1 (A). In previous treatment, we made mistakes on the u...

Process characteristics of non-living free radical polymerization of acrylamide in capillary microreactors were investigated at high temperatures (70~90 °C). Poly(acrylamide) with Mn of 3.4×105 and PDI of 2.6 could be obtained with 1.61 min residence time at 70 °C. The reaction mixture viscosity increased significantly during polymerization resulti...

Microreactors are widely applied for various polymerization processes to produce polymers with controlled molecular weight and structures. In this work, the mixing of polymer solutions in capillary microreactors was investigated with the aid of the biazo-coupling reaction system and high-speed camera. A smaller inner diameter, a higher Dean number...

Porous polyvinylidene fluoride (PVDF) membranes were prepared from PVDF and N-methyl-2-pyrrolidone (NMP) solution system using immersion precipitation phase inversion technique with ammonia as an inert solvent additive. The effects of ammonia amount on pore size, surface morphology, crystallinity, hydrophobic property, oil uptake and water-oil sepa...

Aiming to the difficulty of washing-hand for a one-armed man, functional requirements of washing-hand for a one-armed man is analyzed, and TRIZ theory is described in detail. A novel conceptual assisted washing-hand device for a one-armed man is put forward in this paper. Innovative problems of the assisted washing-hand device design were solved ba...

This work describes the preparation and the properties of poly(vinylidene fluoride) (PVDF) porous membranes. The porous membrane was prepared using phase-inversion method by adding hydrophilic polyvinylpyrrolidone (PVP) as hole-agent. The contrastive analysis of membrane characterizations between the membrane no PVP added and the membrane added PVP...