低乙烯基聚丁二烯-b-聚乙烯基吡啶嵌段共聚物的合成与结构调控  

Synthesis and structural regulation of low vinyl polybutadiene-b-polyvinylpyridine block copolymers

作　　者：王博 杨佳欣 马红卫 李杨[1] 韩丽 WANG Bo;YANG Jia-xin;MA Hong-wei;LI Yang;HAN Li(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024

出　　处：《合成橡胶工业》2023年第4期285-289,共5页China Synthetic Rubber Industry

摘　　要：采用负离子聚合方法,设计合成了聚丁二烯(PB)链段长度相同、聚乙烯基吡啶(PVP)链段长度不同、分子量及其分布可控的低乙烯基PB-PVP两嵌段聚合物(lvPB-b-PVP)。通过凝胶渗透色谱和核磁共振波谱分析了聚合物的分子结构,结果显示其多分散性指数为1.09~1.21,乙烯基摩尔分数为10.4%~11.5%,低乙烯基PB的数均分子量为5.0 kg/mol,PVP的数均分子量约为5~30 kg/mol,制得嵌段共聚物的数均分子量约为10~35 kg/mol。该聚合物在自组装等方面具有一定潜在应用价值。由于聚合物中P 2 VP和P 4 VP两种试样的氢键结合能力存在明显差异,因此,lvPB-b-P2VP的凝胶渗透色谱分析流出时间随其分子量的增大而缩短,而lvPB-b-P4VP的流出时间不变且与PB前体的流出时间相同。A low vinyl polybutadiene(PB)-polyvinylpyridine(PVP)diblock copolymers(lvPB-b-PVP)with the same segment length of PB but different segment length of PVP and controllable molecular weight and its distribution was designed and synthesized using anionic polymerization method.The molecular structure of the polymer was analyzed by gel permeation chromatography and nuclear magnetic resonance spectroscopy.The results showed that the polydispersity index of the molecular weight was 1.09-1.21,where the mole fraction of vinyl was 10.4%-11.5%,number-average molecular weight of low vinyl PB was 5.0 kg/mol,number-average molecular weight of PVP was about 5-30 kg/mol,and number-average molecular weight of the block copolymer was 10-35 kg/mol.This polymer was expected to has certain potential application value in self-assembly.Because the hydrogen bonding ability of P 2 VP and P 4 VP in the polymer was significantly different,the retention time of gel permeation chromatography of lvPB-b-P 2 VP shortened with the increase of its molecular weight,while the retention time of lvPB-b-P 4 VP was constant and the same as that of PB precursor.

关 键 词：乙烯基吡啶 丁二烯 嵌段聚合物 低乙烯基 负离子聚合 结构调控 

分 类 号：TQ333.2[化学工程—橡胶工业]