Synthesis of N-phenylmaleimide copolymer and its heat-resistant modification effect on PVC resin
A poly(N-phenylmaleimide-styrene-acrylonitrile)copolymer(PNSA)latex with a uniform molecular structure and good compatibility with PVC was successfully prepared through seed emulsion polymerization combined with a semi-continuous feeding method.PNSA/PVC blends were prepared through directly compounding PNSA with PVC resin,and its heat-resistant modification effect was evaluated.The results indicated that the PNSA latex exhibited a random structure and a uniform particle-size distribution ranging from 155.6 to 249.3 nm.The molecular structure of PNSA is uniform.The differential scanning calorimetry curve shows a single glass transition temperature(Tg)for PNSA,sug-gesting its excellent compatibility with PVC resin.When the addition amount of PNSA was increased from 0 to 50 wt%,the blends presented an increase in Tg from 84.8 to 107.2℃,and their Vicat softening temperature increased from 71.2 to 91.9℃.In addition to heat-resistant modification,the mechanical properties of the blends were also improved to a certain extent.This study is conducive to further expanding the application field of PVC.
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