A poly(N-isopropylacrylamide)/β-Cyclodextr in (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly( N-isopropylacrylamide-co-acryl acid) (poly(NIPAM-co-AA) with mo no-6-ethanolamine-β-cyclodextrin (E...A poly(N-isopropylacrylamide)/β-Cyclodextr in (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly( N-isopropylacrylamide-co-acryl acid) (poly(NIPAM-co-AA) with mo no-6-ethanolamine-β-cyclodextrin (EAA-β-CD).EAA-β-CD was synthesized via the reaction of mono-6-OTs-β-CD(Ts= p-toluensulfo nyl) with E.The ionic polymer was characterized by means of FT-IR and UV-V isi ble spectroscopes,and DSC.The result shows that the formation of ionic interacti on between poly(NIPAM-co-) and E-β-CD leads to an increase of t he glass transition temperature (T g) of poly(NIPAM-co-).In additio n,not only the ionic polymer exhibits a well-defined lower critical solution te mperature (LCST),but also β-CD on the polymer backbone can be modulated by changing the pH values,as compared with β-CD-conjugated polymers with co valent bonds.Also,β-CD can easily be bound to the polymer backbone in form of free,or inclusion complex.It is expected that the polymer may find some usef ul applications such as drug delivery system.展开更多
Anisotropic composite hydrogels have wide applications in the fields of materials for actuators and sensors.Herein,we report an anisotropic composite hydrogel prepared by a mechanical-strain-induced method.Polymer net...Anisotropic composite hydrogels have wide applications in the fields of materials for actuators and sensors.Herein,we report an anisotropic composite hydrogel prepared by a mechanical-strain-induced method.Polymer networks including poly(N-isopropylacrylamide)(PNIPAM)and sodium alginate(SA),as well as carbon nanotubes(CNTs)are found to align simultaneously by stretching,and then fixed by physical crosslinking through non-covalent bonds.Composite hydrogels with doubly aligned polymer networks showed anisotropic optical and mechanical properties.The actuation performance of the anisotropic composite hydrogels as compared with the isotropic ones was found to be enhanced,which showed the capability of lifting 100 times its weight with 20%contraction strain.Besides,a bilayer hydrogel was designed to bend with a maximum of 390°to mimic the tendril behavior of plants.展开更多
文摘A poly(N-isopropylacrylamide)/β-Cyclodextr in (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly( N-isopropylacrylamide-co-acryl acid) (poly(NIPAM-co-AA) with mo no-6-ethanolamine-β-cyclodextrin (EAA-β-CD).EAA-β-CD was synthesized via the reaction of mono-6-OTs-β-CD(Ts= p-toluensulfo nyl) with E.The ionic polymer was characterized by means of FT-IR and UV-V isi ble spectroscopes,and DSC.The result shows that the formation of ionic interacti on between poly(NIPAM-co-) and E-β-CD leads to an increase of t he glass transition temperature (T g) of poly(NIPAM-co-).In additio n,not only the ionic polymer exhibits a well-defined lower critical solution te mperature (LCST),but also β-CD on the polymer backbone can be modulated by changing the pH values,as compared with β-CD-conjugated polymers with co valent bonds.Also,β-CD can easily be bound to the polymer backbone in form of free,or inclusion complex.It is expected that the polymer may find some usef ul applications such as drug delivery system.
基金supported by the National Key R&D Program of China(2017YFA0207800)the National Natural Science Foundation of China(KZ75006801)+2 种基金the National Natural Science Funds for Distinguished Young Scholars(21725401)the 111 Project(B14009)Beijing Technology and Business University 2019 postgraduate research capacity improvement plan.
文摘Anisotropic composite hydrogels have wide applications in the fields of materials for actuators and sensors.Herein,we report an anisotropic composite hydrogel prepared by a mechanical-strain-induced method.Polymer networks including poly(N-isopropylacrylamide)(PNIPAM)and sodium alginate(SA),as well as carbon nanotubes(CNTs)are found to align simultaneously by stretching,and then fixed by physical crosslinking through non-covalent bonds.Composite hydrogels with doubly aligned polymer networks showed anisotropic optical and mechanical properties.The actuation performance of the anisotropic composite hydrogels as compared with the isotropic ones was found to be enhanced,which showed the capability of lifting 100 times its weight with 20%contraction strain.Besides,a bilayer hydrogel was designed to bend with a maximum of 390°to mimic the tendril behavior of plants.
