New graft copolymers were synthesized by graft-ing N-vinylcaprolactam onto dextran.Their composition and structure were investigated by elemental analyses,infrared spectra and thermogravimetric analyses.By optical tra...New graft copolymers were synthesized by graft-ing N-vinylcaprolactam onto dextran.Their composition and structure were investigated by elemental analyses,infrared spectra and thermogravimetric analyses.By optical transmit-tance measurements,it was found that the aqueous solutions of these graft copolymers showed a temperature-dependent transmittance change due to the introduction of thermosensi-tive poly(N-vinylcaprolactam)graft chains.Moreover,the lower critical solution temperature(LCST)of the graft copolymer in aqueous solution was dependent on its grafting extent and concentration.The LCST value was found to increase with the increase of the grafting extent and decrease with the increase of the copolymer concentration.With these stimuli-response properties,such polysaccharide derivative may hold potential applications in biomedicine and biotechnology.展开更多
Synthetic polymer single-chain nanoparticles(SCNPs)are an emerging new class of nanomaterials that possess similar folded structures as natural proteins.However,most SCNPs reported so far are packed loosely in their i...Synthetic polymer single-chain nanoparticles(SCNPs)are an emerging new class of nanomaterials that possess similar folded structures as natural proteins.However,most SCNPs reported so far are packed loosely in their interior,resembling those of intrinsically disordered proteins(IDPs).Here,we report a facile strategy to synthesize SCNPs with controllable folding in aqueous solution.展开更多
Multi-responsive hydrogels,or‘intelligent’hydrogels that respond to more than one environmental stimulus,have demonstrated great utility as a regenerative biomaterial in recent years.They are structured biocompatibl...Multi-responsive hydrogels,or‘intelligent’hydrogels that respond to more than one environmental stimulus,have demonstrated great utility as a regenerative biomaterial in recent years.They are structured biocompatible materials that provide specific and distinct responses to varied physiological or externally applied stimuli.As evidenced by a burgeoning number of investigators,multi-responsive hydrogels are endowed with tunable,controllable and even biomimetic behavior well-suited for drug delivery and tissue engineering or regenerative growth applications.This article encompasses recent developments and challenges regarding supramolecular,layer-by-layer assembled and covalently cross-linked multi-responsive hydrogel networks and their application to drug delivery and tissue engineering.展开更多
基金supported by the National Natural Science Foundation of China(Grants No.20676155,No.30470476,No.20273086)Natural Science Foundation of Guangdong Province(Grants No.039184,No.06023103)+1 种基金Department of Science and Technology of Guangdong Province(Grant No.2004B33101003)Program for New Century Excellent Talents in Universities of China(NCET-04-0810).
文摘New graft copolymers were synthesized by graft-ing N-vinylcaprolactam onto dextran.Their composition and structure were investigated by elemental analyses,infrared spectra and thermogravimetric analyses.By optical transmit-tance measurements,it was found that the aqueous solutions of these graft copolymers showed a temperature-dependent transmittance change due to the introduction of thermosensi-tive poly(N-vinylcaprolactam)graft chains.Moreover,the lower critical solution temperature(LCST)of the graft copolymer in aqueous solution was dependent on its grafting extent and concentration.The LCST value was found to increase with the increase of the grafting extent and decrease with the increase of the copolymer concentration.With these stimuli-response properties,such polysaccharide derivative may hold potential applications in biomedicine and biotechnology.
基金supported by the National Natural Science Foundation of China(nos.21873040 and 21534004).
文摘Synthetic polymer single-chain nanoparticles(SCNPs)are an emerging new class of nanomaterials that possess similar folded structures as natural proteins.However,most SCNPs reported so far are packed loosely in their interior,resembling those of intrinsically disordered proteins(IDPs).Here,we report a facile strategy to synthesize SCNPs with controllable folding in aqueous solution.
基金Preparation of this review article was supported in part by the National Science Foundation Graduate Research Fellowship Program[DGE-1110007 to J.M.K.].
文摘Multi-responsive hydrogels,or‘intelligent’hydrogels that respond to more than one environmental stimulus,have demonstrated great utility as a regenerative biomaterial in recent years.They are structured biocompatible materials that provide specific and distinct responses to varied physiological or externally applied stimuli.As evidenced by a burgeoning number of investigators,multi-responsive hydrogels are endowed with tunable,controllable and even biomimetic behavior well-suited for drug delivery and tissue engineering or regenerative growth applications.This article encompasses recent developments and challenges regarding supramolecular,layer-by-layer assembled and covalently cross-linked multi-responsive hydrogel networks and their application to drug delivery and tissue engineering.
