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首页> 外文期刊>RSC Advances >Silyl diol ester as a new selectivity control agent in MgCl2-supported Ziegler-Natta systems for propylene polymerization: catalyst structure and polymer properties
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Silyl diol ester as a new selectivity control agent in MgCl2-supported Ziegler-Natta systems for propylene polymerization: catalyst structure and polymer properties

机译：甲硅烷基二醇酯作为丙烯聚合的MgCl 2支撑的齐格勒-NATTA系统中的新选择性控制剂：催化剂结构和聚合物性质

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摘要

In this study, bis(benzoyloxy)dimethylsilane (SDE) was developed as a non-phthalate selectivity control agent (internal donor (ID) and external donor (ED)) in MgCl2-supported Ziegler-Natta (ZN) systems. The impact of SDE as an ID was investigated in regards to chemical composition, morphology, adsorption behavior (using FTIR spectroscopy, WAXD and SEM studies) and the propylene polymerization performance of the catalyst. The results of the adsorption behavior of SDE revealed that SDE, while able to stabilize the electronically unsaturated surfaces of MgCl2 [(104) and (110)], has a rather high tendency to be absorbed on strongly acidic Mg ions at the corners of these crystals. The catalyst with optimum SDE content as an ID afforded a system with reasonable activity and isotacticity (even in the absence of ED) along with broader molecular weight distribution (PDI: 6.2-10) and greater flexural modulus than phthalate-based ZN systems. SDE was also used as a new ED in most widely used fourth- and fifth-generation catalyst systems. The results revealed that in fifth-generation catalyst systems, there was an increase in hydrogen response (>40%) along with an increase of activity without any change in the thermal properties of the final polymer in comparison to a conventional ED (alkoxy silane).
机译：在这项研究中，双（苯甲酰基氧基）二甲基硅烷（SDE）被开发为在氯化镁负载的齐格勒 - 纳塔（ZN）系统的非邻苯二甲酸酯选择性控制剂（内部供体（ID）和外部供体（ED））。 SDE的作为ID的影响在问候化学组成，形态，吸附行为（使用FTIR光谱法，WAXD和SEM研究）和催化剂的丙烯聚合性能进行了研究。 SDE的吸附行为的结果表明，SDE，同时能够稳定的MgCl 2的电子不饱和表面[（104）和（110）〕，一直要在强酸性Mg离子在这些角部吸收了相当高的倾向晶体。用更宽的分子量分布沿着最佳SDE含量为得到用（甚至在没有ED的）合理的活性和全同规整度的系统的ID的催化剂（PDI：6.2-10）和更大的挠曲模量小于基于苯二甲酸的ZN系统。 SDE也被用作最广泛使用的第四和第五代催化剂系统的新ED。结果表明，在第五代催化剂体系，有在氢响应与没有在最终的聚合物的热特性的任何变化相比于常规ED增加活动的（烷氧基硅烷）的增加（> 40％）沿。

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  • 来源
    《RSC Advances》 |2019年第13期|共12页
  • 作者

    Poorsank Fatemeh; Arabi Hassan; Hamedani Nona Ghasemi;

  • 作者单位

    Iran Polymer &

    Petrochem Inst Dept Polymerizat Engn POB 14965-115 Tehran Iran;

    Iran Polymer &

    Petrochem Inst Dept Polymerizat Engn POB 14965-115 Tehran Iran;

    Iran Polymer &

    Petrochem Inst Dept Polymerizat Engn POB 14965-115 Tehran Iran;

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  • 正文语种 eng
  • 中图分类 化学;
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