Aqueous emulsion polymerization of styrene and substituted styrenes using titanocene compounds

被引:10
|
作者
Pragliola, Stefania [1 ]
De Vita, Rosanna [1 ]
Longo, Pasquale [1 ]
机构
[1] Univ Salerno, Dipartimento Chim & Biol, I-84084 Fisciano, SA, Italy
关键词
Emulsion polymerization; Polystyrene; Metallocene; SYNDIOTACTIC-SPECIFIC POLYMERIZATION; MOLECULAR-WEIGHT POLYMER; COORDINATION POLYMERIZATION; RADICAL POLYMERIZATION; PROPYLENE POLYMERIZATIONS; CATALYTIC POLYMERIZATION; METALLOCENE CATALYSTS; ETHYLENE; WATER; COMPLEXES;
D O I
10.1016/j.polymer.2013.01.017
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Aqueous emulsion polymerization of styrene in the presence of half-titanocenes which CpTiCl3, (CpCH2CH2OCH3)TiCl3, and of the titanocene (Ph)(2)C[(Cp)(Flu)Ti]Cl-2 is effected. The polymer features are compared with those of polystyrene obtained in the same reaction conditions, by using Cp2TiCl2 as initiator. Titanocene (Ph)(2)C[(Cp)(Flu)Ti]Cl-2 does not show any activity in styrene polymerization. On the contrary, by using both half-titanocenes CpTiCl3 and (CpCH2CH2OCH3)TiCl3, stereoirregular polystyrene is produced. Aqueous emulsion polymerization of substituted styrenes (3-methyl-styrene, 4-methyl-styrene, 3-chloro-styrene, 4-chloro-styrene) is also performed in the presence of Cp2TiCl2. From all monomers, stereoirregular polymers are obtained. Monomer reactivity results dependent on the substituent on the aromatic ring. Aqueous emulsion styrene - 4-chloro-styrene copolymerizations are performed by using Cp2TiCl2, too. Copolymer composition totally reflects that of comonomers used in the feeding. According to a statistical distribution of comonomers, the product of the reactivity ratios is 1.1. (C) 2013 Elsevier Ltd. All rights reserved.
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页码:1583 / 1587
页数:5
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