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Specific thermoresponsive behaviours exhibited by optically active and inactive phenylalanine modified hyperbranched polyethylenimines in water.
- Source :
-
Chinese Journal of Polymer Science (Springer Science & Business Media B.V.) . Aug2017, Vol. 35 Issue 8, p1035-1042. 8p. - Publication Year :
- 2017
-
Abstract
- 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-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 ) 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHENYLPROPANOIDS
*ORGANIC compounds
*NATURAL resources
*LIQUIDS
*POLYMERS
Subjects
Details
- Language :
- English
- ISSN :
- 02567679
- Volume :
- 35
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Chinese Journal of Polymer Science (Springer Science & Business Media B.V.)
- Publication Type :
- Academic Journal
- Accession number :
- 123772871
- Full Text :
- https://doi.org/10.1007/s10118-017-1950-5