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Lower critical solution temperature behavior of amphiphilic copolymers based on polyaspartamide derivatives

Authors

  • Quang Vu Bach,

    1. Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, 300 Chunchun, Jangan, Suwon, Kyonggi 440-746, Korea
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  • Jong-Rok Moon,

    1. Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, 300 Chunchun, Jangan, Suwon, Kyonggi 440-746, Korea
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  • Doo Sung Lee,

    1. Department of Polymer Science and Engineering, Polymer Technology Institute, Sungkyunkwan University, 300 Chunchun, Jangan, Suwon, Kyonggi 440-746, Korea
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  • Ji-Heung Kim

    Corresponding author
    1. Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, 300 Chunchun, Jangan, Suwon, Kyonggi 440-746, Korea
    • Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, 300 Chunchun, Jangan, Suwon, Kyonggi 440-746, Korea
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Abstract

Novel copolymers consisting of poly(N-isopropylaminoethyl-co-6-hydroxyhexyl aspartamide) and poly (N-isopropylaminoethyl-co-hexyl aspartamide) were prepared from polysuccinimide, which was the thermal polycondensation product of L-aspartic acid, via a ring-opening reaction with 6-amino-L-hexanol (AH) or hexylamine (HA) and N-isopropylethylenediamine at different ratios. The copolymers, containing 75–90 mol % of AH and 35–45 mol % of HA, produced thermoresponsive polymers through their lower critical solution temperatures (LCSTs) in aqueous solution. We could control the LCST could be controlled by modifying the hydrophobic–hydrophilic balance by changing the content of AH or HA. The pH dependencies of the LCST were opposite in these two different copolymer systems. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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