N-苯基马来酰亚胺共聚物的合成及对PVC树脂耐热改性效果研究

›› 2024, Vol. 38 ›› Issue (7): 49-54.

N-苯基马来酰亚胺共聚物的合成及对PVC树脂耐热改性效果研究

孙芳芳¹,宋运运²

1. 郑州科技学院土木建筑工程学院
2. 郑州磨料磨具磨削研究所有限公司

收稿日期:2023-11-27 修回日期:2023-12-15 出版日期:2024-07-26 发布日期:2024-07-26

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

Received:2023-11-27 Revised:2023-12-15 Online:2024-07-26 Published:2024-07-26

摘要/Abstract

摘要： 通过种子乳液聚合结合半连续加料方式，成功聚合出分子结构一致且与聚氯乙烯（PVC）树脂具有良好相容性的聚（N-苯基马来酰亚胺-苯乙烯-丙烯腈）（PNSA）共聚物胶乳，将其与PVC树脂直接复合制备PNSA/PVC复合材料，并对PNAS耐热改性的效果进行评价。结果表明，PNSA纳米胶乳颗粒粒径在155.3~251.5 nm之间，粒径分布均一；PNSA共聚物分子组成呈无规结构，分子结构一致，差示扫描量热曲线呈现单一的玻璃化转变温度（Tg），且与PVC树脂具有极佳的相容性；PNSA含量由0升高至50 %（质量比，下同）时，复合材料的Tg由84.8 ℃提高到107.2 ℃，提高了22.4 ℃，维卡软化温度由71.2 ℃提高到91.9 ℃，提高了20.7 ℃；除耐热性改善以外，复合材料的力学性能也有一定程度的提高，本文的研究有利于PVC应用领域的进一步拓展。

关键词: 聚氯乙烯树脂, N-苯基马来酰亚胺, 自由基共聚, 种子乳液, 耐热改性

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

孙芳芳宋运运. N-苯基马来酰亚胺共聚物的合成及对PVC树脂耐热改性效果研究[J]. , 2024, 38(7): 49-54.

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