短链支化聚乙烯的合成与表征  

Synthesis and Characterization of Short-chain Branched Polyethylene

作　　者：薛英楠[1,2] 王艳辉[2] 刘枫 李杨[1] 唐涛[2] 

机构地区：[1]大连理工大学化工学院高分子材料系,大连116012 [2]中科院长春应用化学研究所,高分子物理与化学国家重点实验室,长春130022

出　　处：《高等学校化学学报》2009年第9期1870-1875,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20734006,50525311,50621302)资助

摘　　要：合成了两类结构明确的乙烯共聚物,通过FTIR,GPC,1HNMR和13CNMR表征了产物的分子结构,分别研究了分子量和短链支化含量对两类共聚物结晶性能的影响.采用阴离子聚合制备分子量(Mw)20000～110000、分子量分布为1.1的1,2-结构摩尔分数为7%左右的聚丁二烯.加氢反应后得到乙烯/1-丁烯模型共聚物的熔点和结晶度随着分子量的增加而下降.采用茂金属催化剂Et[Ind]2ZrCl2催化乙烯与1-己烯共聚合,制备分子量为100000左右,共聚单体摩尔分数为0～5.5%的乙烯/1-己烯共聚物,DSC结果表明其熔点和结晶度随着共聚物中1-己烯含量的升高而降低.Two kinds of ethylene copolymers with controllable structures were synthesized and the molecular parameters were characterized by FTIR, GPC, 1H NMR and 13C NMR systematically. Effects of molecular weight （Mw ） and the content of branched short chains on the crystalline properties of the resultant ethylene copolymers were investigated by DSC, respectively. First, polybutadienes with Mw ranging from 20000 to 110000, low polydispersity index（ PDI = 1.1 ） and almost the same content of vinyl（ molar fraction about 7% ） were synthesized by anionic polymerization. After hydrogenation, the melting point and crystallinity of the obtained model ethylene/1-butene copolymers decreased with the increase in Mwof the copolymers. Second, ethylene/1-hexene copolymers with about Mw 100000 and of 0--5.5% 1-hexene were prepared by copolymerization of ethylene and l-hexene via metallocene catalyst Et[ Ind] 2ZrCl2. DSC results show that the melting point and crystallinity of the ethylene copolymers decrease with the increase of the content of 1-hexene.

关 键 词：阴离子聚合 加氢 茂金属催化剂 分子量 短链支化 

分 类 号：O631[理学—高分子化学]