摘要
采用自由基聚合法在聚合温度为130℃的条件下合成了不同组成的甲基丙烯酸甲酯(MMA)、α-甲基苯乙烯(AMS)共聚物Poly(MMA-co-AMS)。利用核磁共振仪、凝胶渗透色谱仪、差示扫描量热仪及热失重分析仪对共聚物的组成、相对分子质量、耐热性及热稳定性进行表征。研究了AMS单体的引入对Poly(MMA-co-AMS)共聚物的共聚组成、相对分子质量、耐热性及热稳定性的影响。结果表明,通过高温自由基聚合可以合成高相对分子质量、窄相对分子质量分布的Poly(MMA-co-AMS)共聚物;共聚单体AMS的加入可以显著提高聚甲基丙烯酸甲酯(PMMA)树脂的耐热性,当共聚物中AMS共聚含量为10.7%(质量分数,下同)时,共聚物的玻璃化转变温度高达132.6℃;共聚单体AMS的加入会导致PMMA树脂开链解聚温度降低,热稳定性变差。
A series of poly(MMA-co-AMS) copolymers were synthesized with different proportions of methyl methacrylate(MMA) and α-methylstyrene(AMS) by free radical polymerization at 130 ℃. The composition, molecular weight, heat resistance and thermal stability of the obtained products polymer were investigated by means of nuclear magnetic resonance, gel permeation chromatography, differential scanning calorimetry and thermogravimetric analysis. The effect of AMS monomer on the copolymerization composition, molecular weight, heat resistance and thermal stability of poly(MMA-co-AMS) copolymer was also evaluated. The results indicated that the poly(MMA-co-AMS) copolymer with a high molecular weight and narrow molecular weight distribution could be synthesized by free-radical polymerization at high temperatures. The addition of AMS comonomer could improve the heat resistance of PMMA resin significantly. The copolymer containing 10.7 wt% of AMS segment achieved a glass transition temperature of 132.6 ℃ with addition of. The addition of the AMS comonomer could also decrease the temperature for open-chain depolymerization and lead to deterioration in the thermal stability of PMMA resin.
作者
张浩
梁帅
张志彬
杨凤敏
曹春雷
ZHANG Hao;LIANG Shuai;ZHANG Zhibin;YANG Fengmin;CAO Chunlei(Research Center of the Ministry of Education for Synthesized Resin and Special Fiber. Changchun University of Technology. Changchun 130012. China)
出处
《中国塑料》
CAS
CSCD
北大核心
2019年第8期12-17,共6页
China Plastics
关键词
聚甲基丙烯酸甲酯
Α-甲基苯乙烯
自由基聚合
耐热性
热稳定性
poly(methyl methacrylate)
α-methyl styrene
radical polymerization
heat resistance
thermal stability
