PP/PB-1釜内合金的升温淋洗分级及级份表征

Temperature Rising Elution Fractionation and Fractions Characterization of PP/PB-1 in-reactor Alloy

基于反应器颗粒技术制备的聚丙烯(PP)/聚丁烯-1(PB-1)釜内合金,其结构与组成,特别是嵌段共聚物级份的组成、分布、链序列结构等受两段聚合条件的影响较大。本文采用溶剂抽提法和升温淋洗分级法,对中试合成的两种PP/PB-1釜内合金进行分级,采用示差扫描量热仪(DSC)、高温核磁碳谱(^(13)C-NMR)、高温凝胶渗透色谱仪(GPC)对各级份进行表征,明确了合金的结构、组成及丁烯-丙烯嵌段共聚物(PB-b-PP)级份链序列结构。研究两种釜内合金的组成与力学性能关系,对于聚合工艺的优化及先进聚烯烃材料的开发提供依据。

Preparation of in-reactor polyolefin alloy by Reactor Granule Technology provides an effective method for the design and modification of new polyolefin materials.In this work,two pilot-scale polypropylene(PP)/polybutene-1(PB-1)in-reactor alloys prepared based on reactor granule technology with the two-stage polymerization technology were fractionated with solvent extraction fractionation and temperature rising elution fractionation.By using differential scanning calorimeter(DSC),high temperature nuclear magnetic carbon spectrum(^(13)C-NMR)and high temperature gel permeation chromatograph(GPC),the structure and composition,especially the composition and distribution,chain sequence structure and distribution of the PP/PB-1 in-reactor alloy and its fractions were further clarified.The relationship between the composition and properties of two alloys was studied.This study is of great significance for the optimization of polymerization process and the development of advanced polyolefin materials.