A convenient, highly-efficient method for preparation of hydroxyl-terminated isotactic poly(propylene) and functional di-block copolymer

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• 作者：Ya-Nan Ye ; Pei-Yuan Li ; Yong-Gang Shangguan ; ^{shangguan@zju.edu.cn" class="auth_mail} ; Zhi-Sheng Fu ; ^{fuzs@zju.edu.cn" class="auth_mail} ; Qiang Zheng ; Zhi-Qiang Fan
• 关键词：Hydroxyl-terminated isotactic poly(propylene) ; Di-block copolymer ; Functionality ; Coupling reaction
• 刊名：Chinese Chemical Letters
• 出版年：April, 2014
• 年：2014
• 卷：25
• 期：4
• 页码：596-600
• 全文大小：613 K

文摘

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 TiCl₄/MgCl₂/AlEt₃ 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 T_m and T_c, which indicated that PEG was successfully linked to the terminal end of iPP.