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

作者：Ye, Ya-Nan; Li, Pei-Yuan; Shangguan, Yong-Gang^*; Fu, Zhi-Sheng; Zheng, Qiang; Fan, Zhi-Qiang

来源：Chinese Chemical Letters, 2014, 25(4): 596-600.

DOI：10.1016/j.cclet.2014.01.001

• Hydroxyl-terminated isotactic poly(propylene)
• Di-block copolymer
• Functionality
• Coupling reaction

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 C-13 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 H-1 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.

• 出版日期2014-4
• 单位浙江大学