聚甲基丙烯酸缩水甘油酯相对分子量测定和K、α值确定  

Determination of Molecular Weight and K,α Values for Polymers of Glycidyl Methacrylate

作　　者：刘登峰[1] 付英[2] 

机构地区：[1]西安科技大学化工学院,西安710054 [2]西北大学数学系,西安710069

出　　处：《科技导报》2011年第13期62-65,共4页Science & Technology Review

基　　金：国家自然科学基金项目(20676110);陕西省教育厅科学研究计划项目自然科学类专项(2010JK860)

摘　　要：以过氧化二异丙苯(DCP)为引发剂,在160℃时制得了极性单体甲基丙烯酸缩水甘油酯(GMA)的均聚物聚甲基丙烯酸缩水甘油酯(PGMA),并用红外光谱(FT-IR)和热重分析(TGA)对PGMA进行了表征;采用凝胶色谱法(GPC)测定了PGMA的平均分子量,利用黏度法测定了添加不同量引发剂得到的3种聚合产物的特性黏度,在此基础上结合Mark-Houwink方程确定了K、α值。研究表明,GMA通过热引发聚合时形成了分子量较大的均聚体PGMA,引发剂DCP的加入致使GMA的聚合度下降;实验测得PGMA溶液K=9.1×10-4mL/g,α=0.87,说明PGMA分子链在丙酮中呈舒展状态。Polymers of Glycidyl Methacrylate （PGMA） were prepared by using dicumyl peroxide （DCP） as initiator at 160℃, then they were characterized by infrared spectroscope （FT-IR） and thermal gravimetric analysis （TGA）. The average molecular weight of PGMA was determined with gel permeation chromatograph （GPC）, the intrinsic viscosity of three PGMA with different amounts of DCP was measured with viscosimetry, then K and a values in Mark-Houwink equation of polymers were determined. The experimental results show that PGMA of a large molecular weight was formed during the course of GMA polymerization via heat initiation, and the polymerization degree of GMA was declined because of addition of DCP. The K and a values of PGMA solution were determined to be K=9.1 ×10-4mL/g, α =0.87, which indicates that the molecular chain of GMA is in a stretched state in acetone.

关 键 词：聚甲基丙烯酸缩水甘油酯 分子量 增比黏度 特性黏度 

分 类 号：O631.61[理学—高分子化学]