Synthesis of N-phenylmaleimide copolymer and its heat-resistant modification effect on PVC resin

Abstract

Abstract: 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， suggesting 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.

Key words: Polyvinyl chloride resin, N-phenylmaleimide, Free radical copolymerization, Seed emulsion Polymerization, Heat resistant modification

References

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