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propylene copolymerization
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  丙烯共聚
     HOMOGENEOUS METALLOCENE CATALYST FOR POLYMERIZATION Ⅱ. Study on Ethylene/1-hexene and Ethylene/propylene Copolymerization
     均相金属茂催化剂烯烃聚合的研究──Ⅱ.乙烯-己烯、乙烯-丙烯共聚的研究
短句来源
     New Development of Vinyl Acetate Propylene Copolymerization Sizing Agent
     醋酸乙烯丙烯共聚浆料的新进展
短句来源
  “propylene copolymerization”译为未确定词的双语例句
     Studies of Ethylene/Propylene Copolymerization——Effect of1-Octene Prepolymerization
     1-辛烯预聚合对乙烯/丙烯共聚合的影响
短句来源
     ETHYLENE PROPYLENE COPOLYMERIZATION CATALYZED BY Cp 2TiR(OMe)/AlEtCl 2 SYSTEM
     Cp_2TiR(OMe)/AlEtCl_2体系催化乙烯-丙烯共聚合
短句来源
     ETHYLENE/PROPYLENE COPOLYMERIZATION WITH HALF-TITANOCENE/MAO CATALYST Ⅰ. SYNTHESIS OF ETHYLENE/PROPYLENE COPOLYMER
     单茂钛/MAO体系催化乙烯/丙烯共聚合研究Ⅰ.乙烯/丙烯共聚物的合成及聚合反应规律研究
短句来源
     ETHYLENE/PROPYLENE COPOLYMERIZATION WITH HALF-TITANOCENE/MAO CATALYST Ⅱ. ~(13)C-NMR ANALYSIS OF ETHYLENE-PROPYLENE COPOLYMER
     单茂钛/MAO体系催化乙烯/丙烯共聚合研究Ⅱ.乙烯/丙烯共聚物的核磁共振分析
短句来源
     ETHYLENE/PROPYLENE COPOLYMERIZATION WITH HALF-TITANOCENE/MAO CATALYST Ⅲ. CHARACTERIZATION AND STRUCTURE ANALYSIS OF ETHYLENE-PROPYLENE COPOLYMER
     单茂钛/MAO体系催化乙烯/丙烯共聚合研究Ⅲ.乙烯/丙烯共聚物的表征与结构分析
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  相似匹配句对
     Studies on copolymerization of propylene and butadiene
     丙烯与丁二烯共聚合
短句来源
     Copolymerization of ethylene and propylene with DQ catalyst
     Do催化剂催化丙烯共聚合
短句来源
     Oxydehydroaromatization of Propylene
     丙烯氧化脱氢芳构化反应
短句来源
     Market of Propylene
     丙烯的市场现状及其预测
短句来源
     GRAFT COPOLYMERIZATION IN EMULSION
     乳液接枝共聚
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  propylene copolymerization
Propylene copolymerization with 1-hexene and 4-methyl-1-pentene in liquid propylene medium in presence of MAO-activated C2-symmetry ansa-zirconocene rac-Me2Si(4-Ph-2-MeInd)2ZrCl2 was studied.
      
The effects of PCl3 and (n-Bu)3PO4 on ethylene homopolymerization, ethylene-propylene copolymerization and on copolymer properties were evaluated.
      
Ethylene-propylene copolymerization was carried out over MgCl2-supported TiCl4 catalyst with two different reaction schemes; i.e., stopped-flow copolymerization (SFC) and continuously-purged copolymerization (CPC).
      
Studies on the catalyst modification in propylene polymerization using ethylene-propylene copolymerization
      
In the ethylene-propylene copolymerization, two catalyst systems were examined.
      


A highly active supported catalyst (TiCl_4-PCl_3)/MgCl_2-AlEt_3 for ethylene-propylene copolymerization is reported. Ethylene-propylene copolymer withlow molecular weight and narrow molecular weight distribution has beenobtained through the addition of PCl_3 ligand in the catalyst system andthe hydrogen regulation in the course of reaction. The copolymer is sui-table for viscosity index improver for lubricating oil, having rather goodoverall properties in respect of viscosity index, thickness, low...

A highly active supported catalyst (TiCl_4-PCl_3)/MgCl_2-AlEt_3 for ethylene-propylene copolymerization is reported. Ethylene-propylene copolymer withlow molecular weight and narrow molecular weight distribution has beenobtained through the addition of PCl_3 ligand in the catalyst system andthe hydrogen regulation in the course of reaction. The copolymer is sui-table for viscosity index improver for lubricating oil, having rather goodoverall properties in respect of viscosity index, thickness, low temperatureviscosity, and stabilities against shearing, oxidation. heat etc..

本文报导了一种用于乙丙共聚的高活性负载型催化剂(TiCl_4-FCl_3)/MgC1_2-Al(C_2H_5)_3利用催化剂中PCl3的配体效应和反应过程中的氢调作用,得到低分子量,窄分子量分布的乙丙共聚物,适宜于用作润滑油的粘度指数改进剂。它在粘度指数、增稠能力、低温粘度、热安定性、氧化安定性以及剪切稳定性等使用性能上具有较好的综合指标。

ESR method has been used to study the active center states of high yield MgCl2-n-BuOH-i-Bu3Al-TiCl4 catalyst for ethylene and propylene copolymerization. It has been shown that two kinds of coordination states with one and two vacant sites would exist in the alkylated Ti3- ions. The variation of ESR spectra of the catalysts in the presence of ethylene or ethylene and propylene mixture gases show that the ESR signals with g=1.954 and g=1.941 were associated with active centers of Ti3-. Combining with...

ESR method has been used to study the active center states of high yield MgCl2-n-BuOH-i-Bu3Al-TiCl4 catalyst for ethylene and propylene copolymerization. It has been shown that two kinds of coordination states with one and two vacant sites would exist in the alkylated Ti3- ions. The variation of ESR spectra of the catalysts in the presence of ethylene or ethylene and propylene mixture gases show that the ESR signals with g=1.954 and g=1.941 were associated with active centers of Ti3-. Combining with the 13C NMR studies on the composition of copolymerization products and the reactivity ratios, a mechanism for ethylene and propylene simultaneous coordination with active centers of Ti3- in the catalyst has been proposed.

本文用ESR研究MgCL_2-n-BuOH-i-Bu_3Al-TiCl_4/i-Bu_3Al催化剂乙丙共聚机理。ESR谱表明烷基化Ti~(3+)活性中心有单空配位和双空配位两种状态,在乙烯或乙丙烯混和单体存在下ESR谱变化指出g=1.954和g=1.941的共振吸收峰和活性中心有关。结合共聚产物组成及竞聚率的~(13)C-NMR谱分析,提出镁钛系载体催化剂活性中心上乙丙同时配位的机理。

Copoiymerization of ethylene/1-hexene as well as ethylene/propylene with the homogeneous metallocene catalysts CP2ZrC12/MAO and Et(Ind),ZrCl2/MAO were studied. The properties ofthe copolymers were discussed and the structures of the copolymers were analyzed by 13C NMR. Thecomposition of the ethylene/propylene copolymers and the comonomer reactivity ratios were calculated. Itwas found that γE·γP changed with the ratio of ethylene and propylene in the ethylene/propylene copolymerization from γE·γP<1 (alternating...

Copoiymerization of ethylene/1-hexene as well as ethylene/propylene with the homogeneous metallocene catalysts CP2ZrC12/MAO and Et(Ind),ZrCl2/MAO were studied. The properties ofthe copolymers were discussed and the structures of the copolymers were analyzed by 13C NMR. Thecomposition of the ethylene/propylene copolymers and the comonomer reactivity ratios were calculated. Itwas found that γE·γP changed with the ratio of ethylene and propylene in the ethylene/propylene copolymerization from γE·γP<1 (alternating copolymer) to γE·γP>1 (block copolymer). The random copolymers (γE·γP= 1) can be obtained by choosing the proper ratio of ethylene and propylene.

研究了不同单体配比下,均相金属茂催化剂Cp2ZrCl2/MAO和Et(Ind)2ZrCl2/MAO对乙烯-己烯、乙烯-丙烯的共聚性能,对共聚物性能进行了测试讨论。利用13CNMR计算了乙丙共聚物的链段组成及竞聚率,发现竞聚率积γE·γP随己丙共聚的乙烯/丙烯单体配比而变化,从γE·γP<1(嵌段共聚物)变向γE·γP>1(交替共聚物)。选择适当的乙烯/丙烯配比可获得无规共聚物(γE·γP=1)。

 
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