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Synthesis and phase behavior of aqueous poly(N-isopropylacrylamide-co-acrylamide), poly(N-isopropylacrylamide-co-N,N-dimethylacrylamide) and poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate)

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Abstract

Poly(N-isopropylacrylamide) (PNIPAM) and random copolymers of Poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate) (PNIPAM-HEMA), poly(N-isopropylacrylamide-co-acrylamide) (PNIPAM-AAm), and poly(N-isopropylacrylamide-co-N,N-dimethylacrylamide) (PNIPAM-DMAA) with various volume fractions γ of NIPAM were synthesized by radical polymerization. The phase behavior of the polymers in water was investigated by means of optical transmittance and dynamic light scattering. With decreasing γ, the cloud point temperature T cp for PNIPAM-HEMA decreased whereas the T cp for both PNIPAM-AAm and PNIPAM-DMAA increased. Increase of hydrodynamic radius around T cp, which resulted from the aggregation of the globules of each polymer, was observed from dynamic light scattering. The relationships between the reciprocal of T cp of the polymer solutions and 1-γ were linear for the three copolymers in the experimental range of 0.65<γ<1. The results are discussed from the aspect of the interaction parameters of copolymer solutions.

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Acknowledgements

The authors thank the Ministry of Education, Culture, Sports, Sciences, and Technology of Japan for providing scholarship to the first author to pursue his research at the Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University. Financial support from the National Nature Science Foundation of China (contract nos. 20125616 and 20221603) is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan

    Zheyu Shen, Ken Terao, Yasuyuki Maki & Toshiaki Dobashi

  2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing, 100080, People’s Republic of China

    Zheyu Shen & Guanghui Ma

  3. Department of Physics, Faculty of Engineering, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan

    Takao Yamamoto

  4. Department of Macromolecular Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, 560-0043, Japan

    Ken Terao

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  1. Zheyu Shen
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  2. Ken Terao
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  3. Yasuyuki Maki
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  4. Toshiaki Dobashi
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  5. Guanghui Ma
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  6. Takao Yamamoto
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Correspondence to Toshiaki Dobashi.

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Shen, Z., Terao, K., Maki, Y. et al. Synthesis and phase behavior of aqueous poly(N-isopropylacrylamide-co-acrylamide), poly(N-isopropylacrylamide-co-N,N-dimethylacrylamide) and poly(N-isopropylacrylamide-co-2-hydroxyethyl methacrylate). Colloid Polym Sci 284, 1001–1007 (2006). https://doi.org/10.1007/s00396-005-1442-y

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  • DOI: https://doi.org/10.1007/s00396-005-1442-y

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