PGMA-b-PS二嵌段共聚物的RAFT/细乳液合成及表征  

Synthesis and Characterization of PGMA-b-PS Diblock Copolymer by RAFT /Microemulsion Polymerization

作　　者：张梁[1] 郭长昊 李晓芳[1] 宫希杰 叶妮雅[1] 李海英[1] 雷良才[1] 

机构地区：[1]辽宁石油化工大学化学与材料科学学院,辽宁抚顺113001

出　　处：《涂料工业》2014年第7期18-24,共7页Paint & Coatings Industry

摘　　要：以2-(十二烷基三硫代碳酸酯)-2-甲基丙烯酸为链转移剂,利用RAFT/细乳液联合技术合成了相对分子质量分布较窄(PDI=1.53)的大分子链转移剂聚甲基丙烯酸缩水甘油酯。再以该大分子为可逆加成-断裂链转移(RAFT)试剂,通过连续加料的方式加入苯乙烯后进一步引发聚合,得到PGMA-b-PS二嵌段共聚物。采用GPC、FT-IR、1H-NMR、DSC等方法对聚合产物进行了表征。结果表明:合成的聚合物为线型二嵌段共聚物,相对分子质量分布为1.87,该聚合过程具有活性/可控特征。DSC测得二嵌段共聚物具有2个玻璃化转变温度(Tg),分别为77.33℃和98.30℃。此外,还考察了单体加料顺序对聚合过程的影响。Poly （ glycidyl methacrylate） （ PGMA ） with narrow polydispersity （ PDI = 1.53 ） was synthesized in microemulsion system by reversible addition-fragmentation chain transfer （RAFT） polymerization, in which 2 - （ dodecylthio - carbonothioylthio） - 2 - methyl propionic acid was used as the chain transfer agent. Then poly（ glycidyl methacrylate）-b-poly（styrene） （PGMA-b-PS） diblock copolymer was synthesized using styrene as the second monomer, where the styrene were added by continuous loading method. The effect of monomer-feeding sequence on polymerization was investigated. The diblock copolymers were characterized by gel permeation chromatography （ GPC ）, indicating that a linear diblock copolymers with molecular mass polydispersity （PDI） of 1.87 was synthesized. The structure of the copolymer was con- firmed by infrared spectrometry （FT- IR ） and nuclear magnetic resonance spectroscopy （ 1H -NMR）. The glass transition temperature （Tg） （77.33 ℃ and 98.30 ℃ ） of the diblock copolymer was measured by differential scanning calorimetry （DSC）.

关 键 词：可逆加成-断裂链转移(RAFT)自由基聚合 细乳液聚合 嵌段共聚物 聚苯乙烯 聚甲基丙烯酸缩水甘油酯 

分 类 号：TQ630.4[化学工程—精细化工]