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Li H.,Key Laboratory of Food Colloids and Biotechnology Ministry of Education | Liu J.,Key Laboratory of Food Colloids and Biotechnology Ministry of Education | Liu R.,Key Laboratory of Food Colloids and Biotechnology Ministry of Education | Liu X.,Key Laboratory of Food Colloids and Biotechnology Ministry of Education
Journal of Applied Polymer Science | Year: 2015

Novel branched copolymers, poly(styrene-alt-maleic anhydride) (BPSMA), were synthesized through mercapto chain-transfer polymerization with styrene, maleic anhydride (MA), and 4-vinyl benzyl thiol (VBT). Then, the hydroxyl of hydroxyethyl methacrylate was reacted with MA to synthesize branched photosensitive copolymers, p-BPSMAs. Fourier transform IR spectroscopy and 1H-NMR indicated that the synthesis was successful. Gel permeation chromatography indicated that the molecular weight decreased with increasing content of VBT. The thermal properties were characterized by thermogravimetric analysis; the results show that the thermal decomposition temperature of the BPSMAs was greatly enhanced. Real-time IR was used to evaluate the UV-curable kinetics of the p-BPSMAs; the results show that the p-BPSMAs could rapidly photopolymerize under UV irradiation in the presence of photoinitiators. Moreover, the photoresist based on the p-BPSMAs exhibited improved photosensitivity when the VBT content increased, and the photoresist with 12 mol % VBT content had a low value of the dose that retained 50% of the original film thickness (10 mJ/cm2), and a 50-μm resolution could be achieved compared to a linear photoresist. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42838. © 2015 Wiley Periodicals, Inc. September 2015 10.1002/app.42838 Article Articles © 2015 Wiley Periodicals, Inc.. Source

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