摘要
采用等温结晶分级的方法对由负载钛型Ziegler-Natta催化剂在中试装置中催化合成的具有不同丁二烯单体单元含量的反式异戊橡胶釜内合金(TPIR-05,TPIR-10)进行有效分级,并通过13C NMR,GPC,DSC,XRD等方法表征了主要级份的微观结构、丁二烯单元含量(F_(Bd))、分子量(Mw)及其分布(M_w/M_n)、热行为及晶型等.结果表明反式异戊橡胶合金由7种级份(A^G)组成,级份C,D,G为合金TPIR-05的主要级份,级份A^D,G为合金TPIR-10的主要级份. A级份是具有高丁二烯含量(F_(Bd)=22. 4%,摩尔分数)的TPI/TPB多嵌段梯度共聚物; B和D级份是具有低丁二烯含量(FBd=2. 7%~6. 5%)的以长TPI链段为主的多嵌段共聚物; C级份为反式-1,4聚异戊二烯; G级份是一种高丁二烯单元含量(F_(Bd)=15. 6%~20. 4%)的无规共聚物并含有微弱的结晶性.基于上述链结构分析,提出了各级份可能的分子链结构模型.
Trans-1,4-polyisoprene rubber alloys(TPIR)with different butadiene incorporation catalyzed by supported titanium Ziegler-Natta catalyst within pilot plant reactor were effectively fractionated by the stepwise isothermal crystallization fractionation method.The microstructure,molecular weight(M w)and molecular weight distribution(M w/M n),butadiene unit content(F Bd),crystallization behavior and crystal form of main fractions were analyzed by 13 C NMR,GPC,DSC and XRD.The results showed that trans-1,4-polyisoprene rubber alloys were mainly composed of 7 fractions(A-G).TPIR-05 with low butadiene incorporation was mainly composed of fraction C,D,G;TPIR-10 with high butadiene incorporation was mainly composed of fraction A,B,C,D,G.Fraction A having high butadiene unit content(F Bd=22.4%,molar fraction)was gradient multi-block trans-1,4-poly(isoprene-co-butadiene)copolymers containing trans-1,4-polyisoprene(TPI)blocks and trans-1,4-polybutadiene(TPB)blocks;Fractions B,D were gradient trans-1,4-poly-(isoprene-co-butadiene)copolymers with low butadiene unit content(F Bd=2.7%-6.5%)and long TPI blocks;fractions C were trans-1,4-polyisoprene homopolymers;fraction G were random trans-1,4-poly-(isoprene-co-butadiene)copolymers with high butadiene unit content(F Bd=15.6%-20.4%)and weak crystallizability.The possible chain structure models for these fractions were proposed.
作者
牛庆涛
邹陈
王日国
李兰阁
贺爱华
NIU Qingtao;ZOU Chen;WANG Riguo;LI Lange;HE Aihua(Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Rubber-Plastics(Ministry of Education),School of Polymer Science and Engineering, Qingdao University of Science and Technology,Qingdao 266042,China;Shandong Huaju Polymer Materials Co.Binzhou 256500,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2018年第10期2312-2319,共8页
Chemical Journal of Chinese Universities
基金
国家重点基础研究发展计划[批准号:2015CB654700(2015CB654706)]、国家自然科学基金(批准号:51473083)、山东省重大基础研究项目(批准号:ZR2017ZA0304)和泰山学者工程项目资助.
关键词
反式异戊橡胶合金
等温结晶分级
结构表征
分子链模型
trans-1,4-Polyisoprene rubber alloy
Isothermal crystallization fractionation
Structure characterization
Chain structure model
作者简介
王日国,男,工程师,主要从事合成橡胶的工程化研究.E-mail:wangriguo@sina.com.;贺爱华,女,博士,教授,博士生导师,主要从事烯烃配位聚合及聚合物结构与性能研究.E-mail:aihuahe@iccas.ac.cn;ahhe@qust.edu.cn.
