期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 35, 期 8, 页码 1035-1042出版社
SPRINGER
DOI: 10.1007/s10118-017-1950-5
关键词
Hyperbranched; Polyethylenimine; Thermoresponsive; Phenylalanine; Optically active
资金
- National Natural Science Foundation of China [20804027, 21274106]
- Shanghai Key Laboratory of Magnetic Resonance
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 H-1-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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