摘要
采用'活性'自由基聚合的方法合成了不同分子量的苯乙烯和甲基丙烯酸乙酯[polystyrene-block-poly(ethyl methacrylate),PS-b-PEA]嵌段共聚物.并用凝胶渗透色谱(GPC)和红外光谱(FTIR)对所合成的共聚物进行了表征,实验结果显示:在4-羟基-2,2,6,6-四甲基哌啶-1-氧化物自由基(HTEMPO·)和偶氮二异丁腈(AIBN)存在下,苯乙烯聚合反应所得到的聚苯乙烯分子量分布在1.18～1.2范围,分子量随聚合时间的延长而增大(7 200～69 300 g/mol);将该聚苯乙烯溶于甲基丙烯酸乙酯,在(130±2)℃时可以重新引发甲基丙烯酸乙酯的聚合反应,且甲基丙烯酸乙酯的聚合反应具有'活性'聚合的特征,共聚物的数均分子量及分布分别在57 800～107 800 g/mol和1.22～1.26范围,共聚物由FTIR表征显示:在聚苯乙烯接上聚甲基丙烯酸乙酯后,在1 158 cm-1及1 727 cm-1出现其甲基丙烯酸乙酯的特征吸收峰,说明共聚物为嵌段共聚物.
Polystyrene-block-poly （ethyl methacrylate） （PS-b-PEA） was synthesized using living free radical homo-and co-polymerization in the presence of 4-hydroxyl-2,2,6,6-tetramethylpiperridine-oxyl-1 （HTEMPO^·） and azobisisobutyronitrile（AIBN）. The synthesized polystyrene and diblock copolymers were characterized by gel permeation chromatography（GPC）and fourier transform infrared spectroscopy . Experimental results showed that polystyrene was obtained by polymerization of styrene in the presence of 4-hy- droxyl-2,2,6,6-tetramethylpiperridine-oxyl- 1 （ HTEMPO^· ） and azobisisobutyronitrile （ AIBN ） with molecu- lar polydispersity in the range of 1.18 to 1.2 and the number average of molecular weight in the range of 7 200 to 69 300 g/mol, the HTEMPO^·protected polystyrene can initiate the living free radical polymerization of ethyl methacrylate to form the polystyrene-block-poly（ethyl methacrylate）with molecular polydispersity in the range of 1.22 to 1.26 and the number average of molecular weight in the range of 57 800 to 107 800 g/mol, the peaks at 1 158 cm^-1and 1 727 cm^-1 of FTIR showed the copolymer structure is polystyreneblock-poly（ethyl methacrylate）.
出处
《弹性体》
CAS
2005年第5期6-10,共5页
China Elastomerics
基金
国家自然基金资助项目(20476101)
