| A convenient,highly-efficient method for preparation of hydroxyl-terminated isotactic poly(propylene) and functional di-block copolymer |
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| 作者姓名： | Ya-Nan Ye Pei-Yuan Li Yong-Gang Shangguan Zhi-Sheng Fu Qiang Zheng Zhi-Qiang Fan |
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| 作者单位： | MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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| 基金项目： | Acknowledgments This work was supported by the National Natural Science Foundation of China （No. 51173157）, National High-Tech R＆D Program of China （No. 2012＆040305） and the Major State Basic Research Programs （No. 2011CB606001 ）. |
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| 摘 要： | Both terminated functional isotactic polypropylene （iPP） and block copolymers containing iPP segment are desirable for commercial applications. This paper provides a convenient, highly-efficient method to prepare hydroxyl-terminated isotactic polypropylene （iPP-t-OH） and functional di-block copolymer containing the iPP segment through a combination of coordination polymerization and coupling reaction. The coordination polymerization was catalyzed by TiCI4/MgCI2/AIEt3 catalyst system using ZnEt2 as chain transfer agent. Further, the Zn-terminated iPP was oxidized and subsequently hydrolyzed to provide iPP-t-OH. Soxhlet extraction and 13C NMR were used to calculate the isotacticity of iPP-t-OH. The degree of polymerization and the number of hydroxyl groups at the chain end of iPP-t-OH were measured by GPC and 1H NMR. Despite the high molecular weight and heterogeneous reaction, iPP-t-OH is effectively linked with PEG-t-NCO to produce di-block copolymers. DSC analysis of the di-block copolymer shows an obvious decrease in Tm and To, which indicated that PEG was successfully linked to the terminal end of iPP.
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| 关 键 词： | 全同立构聚丙烯 二嵌段共聚物 羟基 制备 催化剂体系 配位聚合 链转移剂 非均相反应 |
| 收稿时间： | 6 September 2013 |
A convenient,highly-efficient method for preparation of hydroxyl-terminated isotactic poly（propylene） and functional di-block copolymer |
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| Ya-Nan Ye,Pei-Yuan Li,Yong-Gang Shangguan,Zhi-Sheng Fu,Qiang Zheng,Zhi-Qiang Fan.A convenient,highly-efficient method for preparation of hydroxyl-terminated isotactic poly(propylene) and functional di-block copolymer[J].Chinese Chemical Letters,2014,25(4):596-600. |
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| Authors: | 《Chinese Chemical Letters》 |
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| Institution: | MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Both terminated functional isotactic polypropylene(iPP) and block copolymers containing iPP segment are desirable for commercial applications.This paper provides a convenient,highly-efficient method to prepare hydroxyl-terminated isotactic polypropylene(iPP-t-OH) and functional di-block copolymer containing the iPP segment through a combination of coordination polymerization and coupling reaction.The coordination polymerization was catalyzed by TiCl_44/MgCl_2/AlEt_3 catalyst system using ZnEt_2 as chain transfer agent.Further,the Zn-terminated iPP was oxidized and subsequently hydrolyzed to provide iPP-t-OH.Soxhlet extraction and ~(13)C NMR were used to calculate the isotacticity of iPP-t-OH.The degree of polymerization and the number of hydroxyl groups at the chain end of iPP-t-OH were measured by GPC and ~1H NMR.Despite the high molecular weight and heterogeneous reaction,iPP-t-OH is effectively linked with PEG-t-NCO to produce di-block copolymers.DSC analysis of the di-block copolymer shows an obvious decrease in T_m and T_c,which indicated that PEG was successfully linked to the terminal end of iPP. |
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| Keywords: | Hydroxyl-terminated isotacticpoly（propylene） Di-block copolymer Functionality Coupling reaction |
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