期刊
POLYMER CHEMISTRY
卷 10, 期 3, 页码 403-411出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8py01617h
关键词
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资金
- National Science Foundation for Distinguished Young Scholars [21525419]
- National Science Foundation of China [21474054]
- National Key Research and Development Program of China [2017YFC1103501]
- PCSIRT [IRT125]
Well-defined multi-arm star thermoresponsive block copolymer nano-assemblies of [poly(N-isopropylacrylamide)-block-polystyrene](n) [(PNIPAM-b-PS)(n)] with n = 1, 2, 3 and 4 arms were synthesized by RAFT dispersion polymerization via polymerization-induced self-assembly. By carefully changing the degree of polymerization (DP) of the polystyrene (PS) block and modulating the polymerization conditions, (PNIPAM-b-PS)(n) nano-assemblies with similar DP and similar chain density but different topology structures of the tethered poly(N-isopropylacrylamide) (PNIPAM) chains were obtained. By comparatively studying the thermoresponse via turbidity analysis, dynamic light scattering, variable-temperature H-1 NMR and rheological analysis, it was found that the phase transition temperature of the tethered PNIPAM chains in the (PNIPAM-b-PS)(n) nano-assemblies correlates to the number of arms, n, demonstrating that the topology of the tethered PNIPAM chains exerts a significant influence on the thermoresponsive phase transition.
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