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Synthesis of PP with broad molecular weight distribution by multiple adding-withdrawing H2 during polymerization process
Author(s): 
Pages: 24-27
Year: Issue:  2
Journal: CHINA SYNTHETIC RESIN AND PLASTICS

Keyword:  聚丙烯负载型齐格勒-纳塔催化剂加氢相对分子量分布结晶形貌;
Abstract: 采用球形TiCl4/MgCl2·内酯型高效催化剂,通过加氢与非加氢气相聚合间多段切换的方法合成了宽相对分子质量分布的聚丙烯(PP).研究了加氢/非加氢切换频率和加氢量对PP相对分子质量及其分布和结晶形貌的影响.总聚合时间相同时,增加加氢/非加氢切换频率对聚合活性的影响较小,对相对分子质量及其分布的影响也不明显,但使PP球晶尺寸减小,球晶形貌不规整程度增大.增大加氢量使相对分子质量分布增至11.0以上,球晶尺寸减小.
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