多孔聚合物微球孔结构对丙烯催化聚合性能的影响

doi:10.11944/j.issn.1000-0518.2020.07.200024

摘要/Abstract

摘要： 多孔聚苯乙烯-二乙烯基苯(PS-DVB)微球具有物理化学性质稳定、比表面积大和生产成本低等优点,同时粒径大小可调,在生物医药、吸附、分离和催化剂载体等领域具有广阔应用前景。通过引入功能单体丙烯氰(AN)、丙烯酰胺(AA)和N-乙烯基咔唑(VC)制备了3种多孔聚合物微球(PPMs),优选含氰基官能化的PPM-AN载体负载Ziegler-Natta(Z-N)催化剂催化丙烯聚合研究孔结构对催化性能的影响。结果表明,一方面,由于存在模板效应和受限作用,聚丙烯呈微球和纳米纤维状;另一方面,PPM-AN载体负载Z-N催化剂中Ti和Mg的负载量随着载体比表面积的增大而增多。丙烯聚合结果表明,同一压力下,由于丙烯单体受PPM-AN载体孔的限制作用,随着孔径增大,重均相对分子质量、相对分子质量分布和等规度总体趋势均是升高。

关键词: 多孔聚合物微球, 聚丙烯催化剂载体, 烯烃受限聚合, 聚丙烯受限结晶

Abstract: The microporous poly(styrene-divinylbenzene) (PS-DVB) microspheres have the advantages of stable physical and chemical properties, large specific surface area, low production cost, and controllable particle sizes. It has broad application prospects in the fields of biomedicine, adsorption, separation and catalyst support. Three kinds of porous polymer microspheres (PPMs) were prepared by introducing the functional monomers acrylonitrile (AN), acrylamide (AA) and N-vinyl carbazole (VC). The results show that, on the one hand, polypropylenes are microspheres and nanofibers due to the template effect and confined effect. On the other hand, the load of Ti and Mg in the Ziegler-Natta catalyst supported by PPM-AN increases with the increase of specific surface area of the support. The results of propylene polymerization show that under the same pressure, the overall trend of molecular mass (M_w), molecular mass distribution (PDI) and isotacticity increase with the increase of pore size because the propylene monomer is restricted by PPM-AN support.

Key words: porous polymer microspheres, polypropylene catalyst support, confined olefin polymerization, confined crystallization of polypropylene

杨正军, 刘博, 黄湃, 聂赫然, 周光远, 张健夫. 多孔聚合物微球孔结构对丙烯催化聚合性能的影响[J]. 应用化学, 2020, 37(7): 746-755.

YANG Zhengjun, LIU Bo, HUANG Pai, NIE Heran, ZHOU Guangyuan, ZHANG Jianfu. Effect of Pore Structures of Porous Polymer Microspheres on Catalytic Propylene Polymerization[J]. Chinese Journal of Applied Chemistry, 2020, 37(7): 746-755.

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