a.Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300354, China
b.Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
Hua-ji Liu (刘华姬), E-mail: liuhuaji@tju.edu.cn
Yu Chen (陈宇), E-mail: chenyu@tju.edu.cn
收稿:2017-02-14,
修回:2017-3-22,
录用:2017-3-27,
纸质出版:2017-08
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Wu-cheng Fang, Ran Zhang, Ye-feng Yao, 等. Specific Thermoresponsive Behaviours Exhibited by Optically Active and Inactive Phenylalanine Modified Hyperbranched Polyethylenimines in Water[J]. Chinese Journal of Polymer Science, 2017,35(8):1035-1042.
Wu-cheng Fang, Ran Zhang, Ye-feng Yao, et al. Specific Thermoresponsive Behaviours Exhibited by Optically Active and Inactive Phenylalanine Modified Hyperbranched Polyethylenimines in Water[J]. Chinese Journal of Polymer Science, 2017, 35(8): 1035-1042.
Wu-cheng Fang, Ran Zhang, Ye-feng Yao, 等. Specific Thermoresponsive Behaviours Exhibited by Optically Active and Inactive Phenylalanine Modified Hyperbranched Polyethylenimines in Water[J]. Chinese Journal of Polymer Science, 2017,35(8):1035-1042. DOI: 10.1007/s10118-017-1950-5.
Wu-cheng Fang, Ran Zhang, Ye-feng Yao, et al. Specific Thermoresponsive Behaviours Exhibited by Optically Active and Inactive Phenylalanine Modified Hyperbranched Polyethylenimines in Water[J]. Chinese Journal of Polymer Science, 2017, 35(8): 1035-1042. DOI: 10.1007/s10118-017-1950-5.
Optically active and inactive hyperbranched polymers with specific thermoresponsive behaviours in water were reported. Through two steps hyperbranched polyethylenimine (HPEI) polymers terminated with different amount of D-phenylalanine (D-Phe)
L-phenylalanine (L-Phe) or DL-phenylalanine (DL-Phe) were prepared and characterized. The analyses on the solution properties by turbidimetry
dynamic light scattering
fluorescence probe and
1
H-NMR demonstrated that all the polymers exhibited specific thermoresponsive behaviours in water
including:(1) In the dilute polymer concentration region
increasing the polymer concentration led to the increase of phase transition temperature; (2) The optically inactive thermoresponsive hyperbranched polymers showed a higher cloud-point temperature (
T
cp
) than their corresponding optically active ones in a relatively higher polymer concentration; (3) At the same polymer concentration the hydrophobic groups of the optically inactive HPEI-DL-Phe formed more perfect hydrophobic domain than those of the optically active HPEI-L-Phe and HPEI-D-Phe.
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