The diffusion of poly(ethy1ene glycol)(PEG)in polypropylene(PP)was investigated using attenuated total reflectance Fourier Transform Infrared Spectroscopy(ATR-FTIR),Atomic Force Micrograph(AFM),and Scanning Electron M...The diffusion of poly(ethy1ene glycol)(PEG)in polypropylene(PP)was investigated using attenuated total reflectance Fourier Transform Infrared Spectroscopy(ATR-FTIR),Atomic Force Micrograph(AFM),and Scanning Electron Microscopy(SEM).It has been found that the diffusion of PEG in PP was greatly affected by the annealing temperature and the molecular weight of PEG.Higher temperature was in favor of PEG to diffuse in PP with fast velocity and reached diffusion equilibrium with shorter time.PEG with higher molecular weight was distributed in PP with bigger phase domains and had lower diffusivity,which resulted in its lesser enrichment on the surface of the PP blend film.展开更多
Novel thermo-responsive cellulose papers were prepared via grafting poly(di(ethylene glycol)methyl ether methacrylate)(PDEGMA)by activators regenerating electron transfer(ARGET)and atom transfer radical polymerization...Novel thermo-responsive cellulose papers were prepared via grafting poly(di(ethylene glycol)methyl ether methacrylate)(PDEGMA)by activators regenerating electron transfer(ARGET)and atom transfer radical polymerization(ATRP).Attenuated total refraction Fourier-transform infrared spectroscopy(ATR-FTIR)and scanning electron microscopy(SEM)measurements of the modified paper showed that PDEGMA brushes were successfully grafted on the paper surface.The thermal stability of the papers before and after grafting was evaluated by thermogravimetric analysis(TGA).The PDEGMA-grafted paper exhibited a two-step thermal degradation process,and presented thermo-responsive characteristics.It was hydrophilic at room temperature but changed rapidly to highly hydrophobic when the temperature rose above 50℃.展开更多
Poly（vinyl chloride）（PVC） is one of the mostly produced plastics in the world and is widely used in single-use medical devices. However, the additives that are often necessary for PVC arouse concerns of its safety...Poly（vinyl chloride）（PVC） is one of the mostly produced plastics in the world and is widely used in single-use medical devices. However, the additives that are often necessary for PVC arouse concerns of its safety, thus quests the modifications of PVC itself. In this study, poly（ethylene glycol）（PEG） and polydimethylsiloxane（PDMS） segments were grafted onto PVC backbone in similar ways, and the chemical structures of the modified PVCs were characterized by Fourier transform infrared spectra, X-ray photoelectron spectra, thermogravimetric analysis and differential scanning calorimetry. Moreover, the water contact angle, protein adsorption, platelet adhesion, cell attachment and proliferation on different material surfaces were studied and compared. It was found that both PEG and PDMS grafting yielded improvement on biocompatibility compared with bare PVC, while hydrophobic PDMS grafted PVC showed more effective on cell attachment and proliferation than that of hydrophilic PEG grafted PVC.展开更多
Linear low-density polyethylene(LLDPE) was melt blended with styrene-maleic anhydride copolymer(SMA).The blending films were then immersed in poly(ethylene glycol)400(PEG400) at room temperature.The surface compositio...Linear low-density polyethylene(LLDPE) was melt blended with styrene-maleic anhydride copolymer(SMA).The blending films were then immersed in poly(ethylene glycol)400(PEG400) at room temperature.The surface composition of the blend films was determined by Fourier transform infra-red spectroscopy coupled with an variable incidence angle attenuated total reflection accessory(ATR-FTIR).It has been found that PEG400 was grafted onto the surface of the films via esterification with SMA.PEG immersion promoted enrichment of SMA onto the surface of the films.The water contact angle data show that grafting of PEG400 can greatly improve the hydrophilicity of the PE surface.These experiments show that surface functionalization of polyethylene films by blending SMA and then surface grafting of PEG is a feasible process,which suggest a viable and simple route for PE surface modification via blending and grafting.展开更多
基金The financial supports by the Science and Technology Program of Guangdong Province(No.2007B080701024)the National Natural Science Foundation of China(Grant No.50273048)。
文摘The diffusion of poly(ethy1ene glycol)(PEG)in polypropylene(PP)was investigated using attenuated total reflectance Fourier Transform Infrared Spectroscopy(ATR-FTIR),Atomic Force Micrograph(AFM),and Scanning Electron Microscopy(SEM).It has been found that the diffusion of PEG in PP was greatly affected by the annealing temperature and the molecular weight of PEG.Higher temperature was in favor of PEG to diffuse in PP with fast velocity and reached diffusion equilibrium with shorter time.PEG with higher molecular weight was distributed in PP with bigger phase domains and had lower diffusivity,which resulted in its lesser enrichment on the surface of the PP blend film.
基金supported by the National Natural Science Foundation of China (No.31200453,31200454)the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
文摘Novel thermo-responsive cellulose papers were prepared via grafting poly(di(ethylene glycol)methyl ether methacrylate)(PDEGMA)by activators regenerating electron transfer(ARGET)and atom transfer radical polymerization(ATRP).Attenuated total refraction Fourier-transform infrared spectroscopy(ATR-FTIR)and scanning electron microscopy(SEM)measurements of the modified paper showed that PDEGMA brushes were successfully grafted on the paper surface.The thermal stability of the papers before and after grafting was evaluated by thermogravimetric analysis(TGA).The PDEGMA-grafted paper exhibited a two-step thermal degradation process,and presented thermo-responsive characteristics.It was hydrophilic at room temperature but changed rapidly to highly hydrophobic when the temperature rose above 50℃.
基金financially supported by the National Natural Science Foundation of China (No.81671792)National Key R&D program of China (No.2016YFC0104100)the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘Poly（vinyl chloride）（PVC） is one of the mostly produced plastics in the world and is widely used in single-use medical devices. However, the additives that are often necessary for PVC arouse concerns of its safety, thus quests the modifications of PVC itself. In this study, poly（ethylene glycol）（PEG） and polydimethylsiloxane（PDMS） segments were grafted onto PVC backbone in similar ways, and the chemical structures of the modified PVCs were characterized by Fourier transform infrared spectra, X-ray photoelectron spectra, thermogravimetric analysis and differential scanning calorimetry. Moreover, the water contact angle, protein adsorption, platelet adhesion, cell attachment and proliferation on different material surfaces were studied and compared. It was found that both PEG and PDMS grafting yielded improvement on biocompatibility compared with bare PVC, while hydrophobic PDMS grafted PVC showed more effective on cell attachment and proliferation than that of hydrophilic PEG grafted PVC.
文摘Linear low-density polyethylene(LLDPE) was melt blended with styrene-maleic anhydride copolymer(SMA).The blending films were then immersed in poly(ethylene glycol)400(PEG400) at room temperature.The surface composition of the blend films was determined by Fourier transform infra-red spectroscopy coupled with an variable incidence angle attenuated total reflection accessory(ATR-FTIR).It has been found that PEG400 was grafted onto the surface of the films via esterification with SMA.PEG immersion promoted enrichment of SMA onto the surface of the films.The water contact angle data show that grafting of PEG400 can greatly improve the hydrophilicity of the PE surface.These experiments show that surface functionalization of polyethylene films by blending SMA and then surface grafting of PEG is a feasible process,which suggest a viable and simple route for PE surface modification via blending and grafting.
