The architecture of hydroxy-functionalized aPS-b-random copolymer-b-PE via one-pot strategy combining living free radical polymerization with coordination polymerization
✍ Scribed by Lifu Ma; Weijiao Liu; Jianjun Yi; Hongli Wang; Qigu Huang; Kejing Gao; Wantai Yang
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 432 KB
- Volume
- 120
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The copolymerization of styrene with ethylene was promoted by CpTiCl 3 /BDGE/Zn/MAO catalyst system combining free radical polymerization with coordination polymerization via sequential monomer addition strategy in one-pot. The effect of polymerization conditions such as temperature, time, ethylene pressure, and Al/Ti molar ratio on the polymerization performance was investigated. The hydroxy-functionalized aPS-b-random copolymer-b-PE triblock copolymer was obtained by solvent extraction and determined by GPC, DSC, WAXD, and 13 C-NMR. The DSC result indicated that the aPS-brandom copolymer-b-PE had a T g at 87 C and a T m at 119 C which attributed to the T g of aPS segment and the T m of PE segment, respectively. The microstructure of the hydroxy-functionalized aPS-b-random copolymer-b-PE was further confirmed by WAXD, 13 C-NMR, and 1 H-NMR analysis; and these results demonstrated that the obtained block copolymer consisted of aPS segment, S-E random copolymer segment, and crystalline PE segment. The connection polymerization of the hydroxy-functionalized aPS with random copolymer-b-PE was revealed by GPC results. V