摘要
以过硫酸铵(APS)/亚硫酸氢钠(NaHSO_(3))为氧化还原引发体系,甲基丙烯酸甲酯(MMA)为单体,通过水相沉淀聚合法制备聚甲基丙烯酸甲酯(PMMA)。研究了温度、引发剂质量分数、单体质量分数等对聚合过程的影响,通过正交实验探索制备高分子量PMMA的最佳工艺条件。采用傅立叶红外光谱(FT-IR)、核磁共振氢谱(^(1)H-NMR)、差示扫描量热法(DSC)、凝胶渗透色谱仪(GPC)对聚合物进行表征。结果表明,温度、引发剂质量分数、单体质量分数的增加,单体转化率升高。温度和引发剂质量分数的增加,PMMA黏均分子量会降低,而单体质量分数的增加,PMMA分子量先增加后减小。在最佳工艺条件下,得到PMMA的重均分子量为5.8×10^(5),玻璃化转变温度为118.2℃。
Poly(methyl methacrylate)(PMMA)was prepared by aqueous precipitation polymerization,with ammonium persulfate(APS)/sodium bisulfite(NaHSO_(3))as redox initiator system and methyl methacrylate(MMA)as monomer.The effects of temperature,initiator concentration and monomer concentration on the polymerization process were investigated.The optimum process conditions for PMMA preparation were explored by orthogonal experiments.The structure and property of the products were characterized by Fourier infrared spectroscopy(FTIR),hydrogen magnetic resonance imaging(^(1)HNMR),differential scanning calorimetry(DSC)and gel penetration chromatograph(GPC).The results show that the monomer conversion increases with the increase of temperature,initiator concentration and monomer concentration.The viscosity average molecular weight of PMMA decreases with the increase of temperature and initiator concentration,while the molecular weight of PMMA increases firstly and then decreases with the increase of monomer concentration.The average molecular weight of PMMA is 5.8×10^(5) and the glass transition temperature is 118.2℃ under the optimum reaction conditions.
作者
赵伟
戴培邦
田磊
ZHAO Wei;DAI Peibang;TIAN Lei(Guangxi Key Laboratory of Information Materials,School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2022年第S01期44-48,共5页
China Plastics Industry
关键词
水相沉淀聚合
聚甲基丙烯酸甲酯
氧化还原引发体系
Aqueous Precipitation Polymerization
Poly(methyl methacrylate)
Redox Initiator System
