摘要
高分子材料的组成、组分分布及链结构与宏观性能紧密相关.因此,分析多组分釜内合金材料的链结构特点与性能之间的关系至关重要.采用升温淋洗分级的方法对两种采用序贯两段聚合原位合成的等规聚丙烯/聚丁烯-1(iPP/iPB)釜内合金在−30℃~140℃温度范围进行分级,采用核磁共振波谱仪、傅里叶变换红外光谱仪、差示扫描量热仪和凝胶渗透色谱仪等表征了级分的链结构及序列分布、热行为、分子量(Mw)及分子量分布(Mw/Mn)等.结果表明iPP/iPB合金主要由5种级分组成,高等规聚丁烯(iPB)为主要组分,同时含有少量的丁烯-丙烯嵌段共聚物(PB-b-PP)和等规聚丙烯(iPP)等.随淋洗温度升高,PB-b-PP级分中PP嵌段长度逐渐增加,PB嵌段长度逐渐减小;在相同的淋洗温度,合金B的嵌段共聚物级分中PP嵌段较长且结晶较完善;合金B中iPB组分及嵌段共聚物组分含量较高,使得合金B具有较高的拉伸强度、弯曲强度、优异的抗冲击性能、较高的维卡软化温度及较快的晶型转变速率.
The performance of materials is closely related to the composition,component distribution and molecular chain structure.Therefore,it is vital to analyze the relationship between chain structure and perfor⁃mance of alloys with multiple components.Two novel isotactic polypropylene/polybutene-1 in-reactor alloys(iPP/iPB)synthesized by sequential two-stage polymerization were fractionated by the temperature rising elu⁃tion fractionation at a temperature ranging from−30℃to 140℃.The chain microstructure and sequences dis⁃tribution,crystallization behavior,molecular weight(Mw)and molecular weight distribution(Mw/Mn)of frac⁃tions were characterized by 13C NMR,FTIR,DSC,GPC.The results showed that iPP/iPB alloys were mainly composed of five components,including the high isotactic polybutene-1(iPB)as the main component,a small amount of poly((butene-1)-block-propylene)block copolymer(PB-b-PP),isotactic polypropylene(iPP),etc.With the increase of elution temperatures,the length of PP blocks in the PB-b-PP components gradually in⁃creased,while that of PB blocks gradually decreased.At the same elution temperature,Alloy B possessed lon⁃ger PP block in copolymer fractions and exhibited more perfect PP crystal.Alloy B containing higher iPB and PB-b-PP components showed higher tensile strength,flexural strength,excellent impact resistance,higher Vicat softening temperature and faster crystal transformation rate.
作者
马亚萍
张宁
郑伟平
肖玮佳
刘晨光
贺爱华
邵华锋
MA Yaping;ZHANG Ning;ZHENG Weiping;XIAO Weijia;LIU Chenguang;HE Aihua;SHAO Huafeng(Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization,Key Laboratory of Rubber-Plastics of Ministry of Education,School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第12期2851-2860,共10页
Chemical Journal of Chinese Universities
基金
山东省重大科技创新工程项目(批准号:2019JZZY010352)
山东省自然科学基金(批准号:ZR2019MB072)
泰山学者工程资助.
关键词
等规聚丙烯/聚丁烯-1合金
升温淋洗分级
结构
性能
Isotactic polypropylene/polybutene-1 alloy
Temperature rising elution fractionation
Structure
Property
