標題: Synthesis, thermal properties, and specific interactions of high T-g increase in poly(2,6-dimethyl-1,4-phenylene oxide)-block-polystyrene copolymers
作者: Kuo, SW
Huang, CF
Tung, PH
Huang, WJ
Huang, JM
Chang, FC
應用化學系
Department of Applied Chemistry
關鍵字: ATRP;block copolymer;specific interactions
公開日期: 24-Oct-2005
摘要: We have synthesized a series of block copolymers of poly(2,6-dimethyl- 1,4-phenylene oxide) and polystyrene (PPO-b-PS copolymer) by atom transfer radical polymerization. The PS content in these copolymer systems was determined by using infrared spectroscopy, thermal gravimetric analysis, and solution and solid-state NMR spectroscopy; good correlations exist between these characterization methods. DSC analyses indicated that the PPO-b-PS copolymers have higher glass transition temperatures than do their corresponding PPO/PS blends. Our FTIR and solid-state NMR spectroscopic analyses suggest that the PPO-b-PS copolymers possess stronger specific interactions that are responsible for the observed relatively higher values of T-g. We found one single dynamic relaxation from the dynamic mechanical analysis, which implies dynamic homogeneity exists in the PPO-b-PS copolymer; this result is consistent with the one single proton spin-lattice relaxation time observed in the rotating frame [T-1 rho(H)] during solid state NMR spectroscopic analysis. In addition, the 2D FTIR spectroscopy reveals evidence for the stronger interactions between segments of PPO and PS through the formation of pi-cation complexes. (c) 2005 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.polymer.2005.07.044
http://hdl.handle.net/11536/13157
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2005.07.044
期刊: POLYMER
Volume: 46
Issue: 22
起始頁: 9348
結束頁: 9361
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