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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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In this study, bis(benzoyloxy)dimethylsilane (SDE) was developed as a non-phthalate selectivity control agent (internal donor (ID) and external donor (ED)) in MgCl _(2) -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 MgCl _(2) [(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：在本研究中，在MgCl _（2）-SupportedZiegler-Natta（Zn）系统中，将BIS（苯甲酰氧基氧基）二甲基硅烷（SDE）作为非邻苯二甲酸酯选择性控制剂（内部供体（ID）和外部供体（Ed））开发。在化学成分，形态，吸附行为（使用FTIR光谱，WAXD和SEM研究）和催化剂的丙烯聚合性能方面，研究了SDE作为ID的影响。 SDE的吸附行为的结果显示，SDE，同时能够稳定MgCl _（2）[（104）和（110）]的电子不饱和表面，在强酸性mg离子上具有相当高的倾向这些晶体的角落。具有最佳SDE含量的催化剂作为ID提供具有合理活性和同向性的系统（即使在没有ED的情况下）以及比邻苯二甲酸酯的Zn系统更宽的分子量分布（PDI：6.2-10）和更大的弯曲模量。 SDE也被用作最广泛使用的第四代和第五代催化剂体系的新ED。结果表明，在第五代催化剂体系中，氢响应（> 40％）的增加随着常规Ed（烷氧基硅烷）而没有最终聚合物的热性质的任何变化的活性增加。

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