The chitosan/PHEA-blended hydrogels were prepared from PHEA and chitosan in various blend ratios.The water contents of the hydrogels were in the range of 50%～80%(wt).The attachment and growth of fibroblast cells(L929...The chitosan/PHEA-blended hydrogels were prepared from PHEA and chitosan in various blend ratios.The water contents of the hydrogels were in the range of 50%～80%(wt).The attachment and growth of fibroblast cells(L929) on the hydrogels were studied.The results indicated the PHEA content in hydrogels has great effect on cell attachment but has little effect on the growth of L929 cells.展开更多
Tetraacryloxyethoxysilane syntheslied by the reaction of 2-hydroxyethyl acrylatewith silicon tetrachloride was used in preparation of the transparent poly (2-hydroxyethylacrylate)/silicon dioxide composites by sol-gel...Tetraacryloxyethoxysilane syntheslied by the reaction of 2-hydroxyethyl acrylatewith silicon tetrachloride was used in preparation of the transparent poly (2-hydroxyethylacrylate)/silicon dioxide composites by sol-gel method. The composition of the compositeswere analyzed by electronic energy spectroscopy, elemental analysis and thermogravimetry.The composites have transparency greater than 80%, with thermal stability being increasedwith the silicon dioxide content.展开更多
A novel mussel-inspired adhesive polymer（PHEA-DOPA） containing the 3,4-dihydroxyphenylalanine（DOPA） functional group based on polyaspartamide derivatives was synthesized. The corrosion protection of the waterborne...A novel mussel-inspired adhesive polymer（PHEA-DOPA） containing the 3,4-dihydroxyphenylalanine（DOPA） functional group based on polyaspartamide derivatives was synthesized. The corrosion protection of the waterborne epoxy coatings containing the adhesive polymers was investigated by electrochemical impedance spectroscopy（EIS）. The results indicated that the PHEA-DOPA could improve the corrosion resistance of the waterborne epoxy coating. The corrosion products were also analyzed by Raman microspectroscopy（RM）, indicating the formation of the insoluble DOPA-Fe complexes on the carbon steel surface. These complexes simultaneously acting as a passivating layer, can inhibit the process of corrosion at the metal-solution interface. The differential scanning calorimeter（DSC） measurement indicated that PHEA-DOPA can increase the crosslinking density of coating. The effect of O;on the protective mechanism of the PHEA-DOPA coating in a 3.5% NaCl solution was also evaluated by EIS. The results indicated that the barrier effect was significantly improved under aerated conditions because DOPA was oxidized to DOPA-quinone（Dq） by O;, which triggered the reaction with Fe ions that were released from the surface of the carbon steel. This led to more compact coatings.展开更多
基金国家重点基础研究发展规划 ( 973)项目基金资助 (No .G19990 6 470 5 )~~
文摘The chitosan/PHEA-blended hydrogels were prepared from PHEA and chitosan in various blend ratios.The water contents of the hydrogels were in the range of 50%～80%(wt).The attachment and growth of fibroblast cells(L929) on the hydrogels were studied.The results indicated the PHEA content in hydrogels has great effect on cell attachment but has little effect on the growth of L929 cells.
文摘Tetraacryloxyethoxysilane syntheslied by the reaction of 2-hydroxyethyl acrylatewith silicon tetrachloride was used in preparation of the transparent poly (2-hydroxyethylacrylate)/silicon dioxide composites by sol-gel method. The composition of the compositeswere analyzed by electronic energy spectroscopy, elemental analysis and thermogravimetry.The composites have transparency greater than 80%, with thermal stability being increasedwith the silicon dioxide content.
基金the National Key Technology Support Program of China(No.2014BAE12B01) for the financial support of this research
文摘A novel mussel-inspired adhesive polymer（PHEA-DOPA） containing the 3,4-dihydroxyphenylalanine（DOPA） functional group based on polyaspartamide derivatives was synthesized. The corrosion protection of the waterborne epoxy coatings containing the adhesive polymers was investigated by electrochemical impedance spectroscopy（EIS）. The results indicated that the PHEA-DOPA could improve the corrosion resistance of the waterborne epoxy coating. The corrosion products were also analyzed by Raman microspectroscopy（RM）, indicating the formation of the insoluble DOPA-Fe complexes on the carbon steel surface. These complexes simultaneously acting as a passivating layer, can inhibit the process of corrosion at the metal-solution interface. The differential scanning calorimeter（DSC） measurement indicated that PHEA-DOPA can increase the crosslinking density of coating. The effect of O;on the protective mechanism of the PHEA-DOPA coating in a 3.5% NaCl solution was also evaluated by EIS. The results indicated that the barrier effect was significantly improved under aerated conditions because DOPA was oxidized to DOPA-quinone（Dq） by O;, which triggered the reaction with Fe ions that were released from the surface of the carbon steel. This led to more compact coatings.
