STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅱ. FRACTIONATION AND CHARACTERIZATION OF PE-b-sPS BLOCK COPOLYMER

FANG Yutang; ZHU Fangming; LIN Shang’an

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STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅱ. FRACTIONATION AND CHARACTERIZATION OF PE-b-sPS BLOCK COPOLYMER

Research Article | 更新时间：2021-03-19

- STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅱ. FRACTIONATION AND CHARACTERIZATION OF PE-b-sPS BLOCK COPOLYMER
- Acta Polymerica Sinica Issue 4, Pages: 504-508(2001)
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- Published：20 August 2001，
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FANG Yutang, ZHU Fangming, LIN Shang’an. STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅱ. FRACTIONATION AND CHARACTERIZATION OF PE-b-sPS BLOCK COPOLYMER. [J]. Acta Polymerica Sinica (4):504-508(2001)
DOI：

FANG Yutang, ZHU Fangming, LIN Shang’an. STUDIES ON SYNDIOTACTIC POLYSTYRENE-b-POLYETHYLENE BLOCK COPOLYMER CATALYZED BY A NOVEL TITANOCENE CATALYST Ⅱ. FRACTIONATION AND CHARACTERIZATION OF PE-b-sPS BLOCK COPOLYMER. [J]. Acta Polymerica Sinica (4):504-508(2001) DOI：

摘要

将五甲基茂基三苄氧基钛 (Cp*Ti(OBz)3) 改性甲基铝氧烷 (mMAO)催化体系以顺序加料溶液法合成的乙烯与苯乙烯嵌段共聚反应产物进行沸丁酮、沸四氢呋喃 (THF)和沸氯仿等溶剂连续抽提分离

发现嵌段共聚物主要存在于THF和CHCl3的可溶级分中

嵌段共聚物的总含量占共聚产物的 22.8wt%～38.2wt%

对THF和CHCl3可溶级分分别用13C-NMR、WAXD、DSC和GPC等手段进行表征.13C-NMR谱显示出含有支化聚乙烯链段和间规聚苯乙烯链段的嵌段共聚物特殊结构

WAXD谱表明嵌段共聚物因两链段的相互缠结使各自结晶度显著较低

由于嵌段共聚物苯乙烯链段较长、乙烯链段较短

DSC图谱只显示苯乙烯链段的结晶熔融峰

GPC曲线表明

单茂钛催化体系催化乙烯-苯乙烯嵌段共聚合的单一活性中心特征 .由此对Cp*Ti(OBz)3 mMAO催化体系的苯乙烯-乙烯嵌段共聚合机理进行初探

Abstract

The sequential block copolymerization products of styrene and ethylene calalyzed by mono-titanocene catalyst η5-pentamethylcyclopentadienyltribenzyloxy titanium [Cp* Ti(OBz)3] and modified methylaluminoxane (mMAO) were fractionated by successive extraction with boiling butanone

THF and chloroform solvents．The isolated block copolymers (22.8 wt％～38.2 wt％ in total)

chiefly existing in THF and chloroform soluble fractions

were characterized by 13C-NMR

WAXD

DSC and GPC methods．The 13C-NMR spectrum of copolymers showed a special structure which composed of sPS segments and branching PE segments．The WAXD pattern of copolymers displayed low crystallinity of both segments．There are long sPS segments and short PE segments in the block copolymers

which showed single sPS melt peak in DSC curves．GPC curves indicated the block copolymerization of styrene and ethylene with mono-titanocene catalytic system has single active spices character．A block copolymerization mechanism of styrene and ethylene with Cp* Ti (OBz)3/mMAO catalyst was proposed．

关键词

茂金属催化剂聚乙烯b间规聚苯乙烯嵌段共聚物抽提分离结构表征

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