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Polymerization-induced phase separation in polyethersulfone modified epoxy resin systems: effect of curing reaction mechanism

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Abstract

Polyethersulfone (PES)-modified epoxy systems with stepwise reaction were studied throughout the entire curing process by using optical microscopes, time-resolved light scattering (TRLS), and a rheolometry instrument compared with that of chainwise polymerization. The results suggested that the phase separation process is mainly controlled by the diffusion of epoxy oligomers for stepwise mechanism system and by that of epoxy monomers for chainwise mechanism system. In case of high PES content (SPES-20%) light-scattering results showed a viscoelastic phase separation and the characteristic relaxation time of phase separation can be described well by the WLF equation. However, in the case of low PES content (SPES-14%) secondary phase separation phenomenon was observed by Optical Microscope and further demonstrated by rheological study.

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Authors and Affiliations

  1. The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education and Department of Macromolecular Science, Fudan University, Shanghai, 200433, China

    Wang MingHai, Yu YingFeng & Li ShanJun

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  1. Wang MingHai
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  2. Yu YingFeng
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  3. Li ShanJun
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Supported by the National Natural Science Foundation of China (Grant No. 5027 3007)

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Wang, M., Yu, Y. & Li, S. Polymerization-induced phase separation in polyethersulfone modified epoxy resin systems: effect of curing reaction mechanism. SCI CHINA SER B 50, 554–561 (2007). https://doi.org/10.1007/s11426-007-0060-6

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  • DOI: https://doi.org/10.1007/s11426-007-0060-6

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