This paper aims to prepare a PVA-GAG-COL composite with polyvinyl alcohol (PVA), glycosaminoglycan (GAG) and collagen (COL) by the method of freeze drying and to investigate the feasibility as a tissue engineering sca...This paper aims to prepare a PVA-GAG-COL composite with polyvinyl alcohol (PVA), glycosaminoglycan (GAG) and collagen (COL) by the method of freeze drying and to investigate the feasibility as a tissue engineering scaffold for tissue or organ repairing. In this study, SEM was used to observe the morphology. Biocompatibility was tested by cell culture with the extracted fluid of composite materials. Different proportional scaffolds could be obtained with different concentrations and alcoholysis degree of PVA. Different proportional scaffolds also had different porous structures. SEM proved that large amount of porous structure could be formed. Biocompatibility test showed that the extracted fluid of composite materials was nontoxic, which could promote the adhesion and proliferation of the fibroblast. Fibroblast could grow on the scaffold normally.A porous scaffold for tissue engineering with high water content can be fabricated by PVA, GAG and COL, which has excellent cell biocompatibility. The porous structure shows potential in tissue engineering and cell culture.展开更多
The effects of chemical structure, i. e. side chain structure and their contents, on thepermeability of pure SO_2, N_2 and their mixture gases for the sulfoxide grafted poly (vinylalcohol) (RVSO-PVA) membranes have be...The effects of chemical structure, i. e. side chain structure and their contents, on thepermeability of pure SO_2, N_2 and their mixture gases for the sulfoxide grafted poly (vinylalcohol) (RVSO-PVA) membranes have been investigated:where R=Me, Et, Pr, t-Bu and Ph. It was notable that introduction of sulfoxide group intoPVA side chain greatly enhanced the permselectivity of sulfur dioxide. SO_2 permeability andseparation factor of these polymers increased markedly as the size of side chain increased. Thesulfoxide content of the polymer also played an important role in the pure and mixture gasespermeation. Some explanations have been made to interpret this unique gas separation behaviour.展开更多
This paper focuses on the dielectric constant("0),dielectric loss factor("00)and frequency dependent conductivity(ac)properties of newly prepared poly(vinylalcohol)(PVA)chitosan(CS)composite films incorpora...This paper focuses on the dielectric constant("0),dielectric loss factor("00)and frequency dependent conductivity(ac)properties of newly prepared poly(vinylalcohol)(PVA)chitosan(CS)composite films incorporated with different concentrations of LiClO_(4).The composite films were prepared using solution casting technique.The complexation between salt and polymer host is confirmed by FT Raman and UV-Vis studies.The sample containing 20 wt.%LiClO_(4)exhibits a highest ionic conductivity of 3106 S/cm at room temperature.The dielectric properties of the composites follow non-Debye behavior.展开更多
基金National High-tech Reasearch and Development Program of China(863 Program)grant number:2077AA09Z436+1 种基金Guangdong Project '211'grant number:50621030
文摘This paper aims to prepare a PVA-GAG-COL composite with polyvinyl alcohol (PVA), glycosaminoglycan (GAG) and collagen (COL) by the method of freeze drying and to investigate the feasibility as a tissue engineering scaffold for tissue or organ repairing. In this study, SEM was used to observe the morphology. Biocompatibility was tested by cell culture with the extracted fluid of composite materials. Different proportional scaffolds could be obtained with different concentrations and alcoholysis degree of PVA. Different proportional scaffolds also had different porous structures. SEM proved that large amount of porous structure could be formed. Biocompatibility test showed that the extracted fluid of composite materials was nontoxic, which could promote the adhesion and proliferation of the fibroblast. Fibroblast could grow on the scaffold normally.A porous scaffold for tissue engineering with high water content can be fabricated by PVA, GAG and COL, which has excellent cell biocompatibility. The porous structure shows potential in tissue engineering and cell culture.
基金This project is supported by the National Education Commission of China and the Technology Commission of Zhejiang Province.
文摘The effects of chemical structure, i. e. side chain structure and their contents, on thepermeability of pure SO_2, N_2 and their mixture gases for the sulfoxide grafted poly (vinylalcohol) (RVSO-PVA) membranes have been investigated:where R=Me, Et, Pr, t-Bu and Ph. It was notable that introduction of sulfoxide group intoPVA side chain greatly enhanced the permselectivity of sulfur dioxide. SO_2 permeability andseparation factor of these polymers increased markedly as the size of side chain increased. Thesulfoxide content of the polymer also played an important role in the pure and mixture gasespermeation. Some explanations have been made to interpret this unique gas separation behaviour.
基金The authors are thankful to Department of Atomic Energy,Board of Research in Nuclear Sciences(BRNS),Government of India for the research project(2010/37C/7/BRNS/832)Department of Science and Technology(DST),Government of India for the research project(SR/FTP/PS-011/2010).
文摘This paper focuses on the dielectric constant("0),dielectric loss factor("00)and frequency dependent conductivity(ac)properties of newly prepared poly(vinylalcohol)(PVA)chitosan(CS)composite films incorporated with different concentrations of LiClO_(4).The composite films were prepared using solution casting technique.The complexation between salt and polymer host is confirmed by FT Raman and UV-Vis studies.The sample containing 20 wt.%LiClO_(4)exhibits a highest ionic conductivity of 3106 S/cm at room temperature.The dielectric properties of the composites follow non-Debye behavior.
