A series of poly (L-glutamate) s grafted with oligo (ethylene glycol) (OEG) side-chains through the thioether linkages (PALG
n
-
g
-EG
x
x
=2
3 and 4) were prepared by ring-opening polymerization (ROP) of
γ
-allyl-L-glutamate
N
-carboxyanhydride (ALG-NCA) and thiol-ene photoaddition. The chemical structures and physical properties were characterized by
1
H-NMR
Fourier transform infrared (FTIR)
circular dichroism (CD)
etc
. The PALG
n
-
g
-EG
x
samples with
x
=3 and 4 displayed lower critical solution temperature (LCST) in water due to the presence of OEG units. The clouding point (CP) of polypeptides can be finely tuned by changing the side chain structures
molecular weights and sample concentrations. In addition
the thioether linkages in the side chains offer additional redox-responsive properties. The influence of both OEG units and thioether linkages on the LCST behavior was systematically investigated. This work provides an efficient way to prepare multi-stimuli responsive materials with highly tunable properties.
关键词
Keywords
references
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EFFECTS OF MOLECULAR WEIGHT ON THERMAL RESPONSIVE PROPERTY OF PEGYLATED POLY-L-GLUTAMATES
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相关作者
Shusheng Zhang
Chongyi Chen
Zhibo Li
Jun-Yu Zhang
Jia-Yi Cai
Dong-Hui Zhang
Long-Qiang Liu
Zhong-Hua Zhi
相关机构
State Key Laboratory of Bioreactor Engineering, Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology
Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences
State Key Laboratory of Molecular Engineering of Polymers, Fudan University
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University
College of Biological, Chemical Sciences and Engineering, Jiaxing University