甲基丙烯酸六氟丁酯与甲基丙烯酸丁酯共聚物的制备和性能研究

Preparation and Performance Study of HFBMA-BMA Copolymer

对甲基丙烯酸六氟丁酯与甲基丙烯酸丁酯在高温下的本体共聚合进行了研究。重点研究了两种单体的竞聚率和不同单体组成制备得到的共聚物的性能。采用KT和FR两种作图法及YBR计算法对单体的竞聚率进行了计算和比较。结果表明,在80、120和150℃下,甲基丙烯酸六氟丁酯(HFBMA)与甲基丙烯酸丁酯(BMA)的竞聚率分别为0.717和0.689、0.792和0.773、0.829和0.776,并得到了HFBMA和BMA在三个温度下的共聚物组成曲线。研究和讨论了共聚物组成对共聚物的玻璃化转变温度和热稳定性等热性能以及折射率和透光率等光学性能的影响。该共聚物玻璃化转变温度介于21～46℃之间,初始热分解温度介于260～280℃之间;折射率介于1.409～1.483之间,具有较高的透光率。

The copolymerization of hexafluorobutyl methacrylate （HFBMA） and butyl methacrylate （BMA） was performed in a bulk eopolymerization system at high temperature. The reactivity ratios of two monomers and the eopolymer＇s property were measured. The monomer reactivity ratios were calculated by using two graphical methods, KT and FR methods, and YBR caleulative method. The result indicated when the temperature was 80℃ , 120 % and 150 ℃ , the reactivity ratios of HFBMA and BMA were rHEBMA = 0. 717 and rBMA =0. 689, rHEBMA =0. 792 and rBMA =0. 773, rHEBMn =0. 829 and rBMA =0. 776 respectively. The copolymer composition curves of HFBMA and BMA were obtained. Effects of copolymer composition on the glass transition temperature, thermal decomposition temperature, refraction index and light transmittance of the copolymers were investigated. The refraction index, glass transition temperature and initial decomposition temperature of the copolymer were about 1. 409 - 1. 483, 21℃ - 46 ℃, 260 ℃ - 280℃ respectively. The copolymer has a good performance of light transmittance.