Temperature rising elution fractionation of polypropylene produced by heterogeneous Ziegler-Natta catalysts

被引：0

作者：

Xu, JT ^{[1
]}

Feng, JX

Yang, SL

Yang, YQ

Kong, XM

机构：

[1] Zhejiang Univ, Dept Polymer Sci & Engn, Hangzhou 310027, Peoples R China

[2] Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

来源：

EUROPEAN POLYMER JOURNAL | 1998年 / 34卷 / 3-4期

关键词：

D O I：

10.1016/S0014-3057(97)00148-1

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Four catalyst systems, MgCl2/TiCl4-AlEt3, MgCl2/di-n-butyl phthalate (DNBP)TliCl(4)-AlEt3, MgCl2/TiCl4-AlEt3/diphenyl dimethoxyl silane (DPDMS) and MgCl2/DNBP/TiCl4-AlEt3/DPDMS, were prepared and the polypropylene samples obtained using them were fractionated with the preparative temperature rising elution fractionation (TREF) technique. It was found that electron donors had an important influence on the tacticity distribution of polypropylene. Some key fractions were characterized by C-13 NMR and the structures of the fractions eluted at different temperatures were analyzed. The results showed that the fractionation was performed mainly according to tacticity and that electron donors increased the percentage of isotactic fractions. It was also observed that electron donors decreased the isotacticity of the first fraction. A possible explanation was proposed. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：431 / 434

页数：4

共 50 条

[31] EFFECT OF HYDROGEN ON THE MOLECULAR-WEIGHT OF POLYPROPYLENE WITH ZIEGLER-NATTA CATALYSTS
SOGA, K
SIONO, T
POLYMER BULLETIN, 1982, 8 (5-6) : 261 - 268
[32] External donors in Ziegler-Natta catalysts
Acta Polytechnica Scandinavica, Chemical Technology and Metallurgy Series, 1995, (223):
[33] NICKEL ZIEGLER-NATTA HYDROGENATION CATALYSTS
REGULI, J
STASKO, A
CHEMICKE LISTY, 1982, 76 (10): : 1085 - 1105
[34] Study on the energy distribution of active sites in heterogeneous Ziegler-Natta catalysts
Novokshonova, LA
Kovaleva, NY
Gavrilov, YA
Krasheninnikov, VG
Leipunskii, IO
Zhigach, AN
Larichev, MN
Chebunin, MV
POLIMERY, 1998, 43 (04) : 239 - 242
[35] Preactive Site in Ziegler-Natta Catalysts
Blaakmeer, E. S.
Wensink, Frank J.
van Eck, Ernst R. H.
de Wijs, Gilles A.
Kentgens, Arno P. M.
JOURNAL OF PHYSICAL CHEMISTRY C, 2019, 123 (23): : 14490 - 14500
[36] Ziegler-Natta catalysts for olefin polymerizations
Soga, K
Shiono, T
PROGRESS IN POLYMER SCIENCE, 1997, 22 (07) : 1503 - 1546
[37] ON THE STRUCTURE AND STEREOSPECIFICITY OF ACTIVE-CENTERS OF ZIEGLER-NATTA HETEROGENEOUS CATALYSTS
MINSKER, KS
SANGALOV, IA
PONOMAREV, OA
IANBORISOV, VM
DOKLADY AKADEMII NAUK SSSR, 1980, 252 (04): : 886 - 889
[38] Metallocene catalysts for ziegler-natta polymerization
Bercaw, JE
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1997, 213 : 343 - INOR
[39] STEREOREGULARITY IN HETEROGENEOUS ZIEGLER-NATTA CATALYSIS
COSSEE, P
TRANSACTIONS OF THE FARADAY SOCIETY, 1962, 58 (474): : 1226 - &
[40] Ziegler-Natta catalysts for olefin polymerizations
Japan Advanced Inst of Science and, Technology, Ishikawa Prefecture, Japan
Prog Polym Sci (Oxford), 7 (1503-1546):

← 1 2 3 4 5 →