Journal
CHINESE JOURNAL OF POLYMER SCIENCE
Volume 35, Issue 8, Pages 1035-1042Publisher
SPRINGER
DOI: 10.1007/s10118-017-1950-5
Keywords
Hyperbranched; Polyethylenimine; Thermoresponsive; Phenylalanine; Optically active
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Funding
- National Natural Science Foundation of China [20804027, 21274106]
- Shanghai Key Laboratory of Magnetic Resonance
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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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