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Preparation of the individual compact single-chain globular particulates of Poly(N-isopropylacrylamide)

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Abstract

The compact single-chain (SC) particulates of Poly(N-isopropylacrylamide) (PNIPAM), which have been formed above its lower critical solution temperature in an aqueous solution containing the surfactant of sodium n-dodecyl sulfate (SDS), were recovered from the solution by freeze-drying. Under scanning electron microscopy, the compact particulate appears as a spherical or elliptical particulate individually dispersed in SDS, which acts as a solid solvent to prevent agglomeration. The conformation of the compact SC particulates of PNIPAM dispersed in SDS had been studied by the solid-state high-resolution 13C NMR spectroscopy. The 13C spin-lattice relaxation time T 1 of the SC sample was determined in comparison with that of the original one. It was found that the T 1 of the methyl carbon in the isopropyl group of the SC sample was about 45% higher than that in the original multichain sample, which revealed the differences in the motion of the methyl group in the different condensed states and illuminated the characteristic conformation of the compact SC globular particulates of PNIPAM.

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Acknowledgement

This work was supported by the Nature Science Foundation of China (grant nos. 20204004 and 20474026).

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Authors and Affiliations

  1. Key Laboratory for Mesoscopic Chemistry of Ministry of Education and Department of Polym. Sci. and Eng., College of Chem. and Chem. Eng., Nanjing University, Nanjing, Jiangsu 210093, People’s Republic of China

    Hu Yang, Weisi Yin & Rongshi Cheng

  2. Key Laboratory of Educational Ministry for Optics and Magnetic Resonance Spectroscopy and Analytical Center, East China Normal University, Shanghai 200062, People’s Republic of China

    Xuxin Kong, Min Xu, Yefeng Yao & Qun Chen

  3. College of Material Science and Engineering, Polymer Institute, South China University of Technology, Guangzhou, Guangdong 510640, People’s Republic of China

    Rongshi Cheng

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  1. Hu Yang
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  2. Weisi Yin
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  3. Xuxin Kong
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  4. Min Xu
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  5. Yefeng Yao
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  6. Qun Chen
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  7. Rongshi Cheng
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Correspondence to Hu Yang.

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Yang, H., Yin, W., Kong, X. et al. Preparation of the individual compact single-chain globular particulates of Poly(N-isopropylacrylamide). Colloid Polym Sci 284, 935–940 (2006). https://doi.org/10.1007/s00396-005-1441-z

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  • DOI: https://doi.org/10.1007/s00396-005-1441-z

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