The thermal decomposition behaviors of four chemically modified polyethylene were investigated by high resolution pyrolysis gas chromatography\|mass spectrometry (HR PyGC-MS).The results revealed that substituents att...The thermal decomposition behaviors of four chemically modified polyethylene were investigated by high resolution pyrolysis gas chromatography\|mass spectrometry (HR PyGC-MS).The results revealed that substituents attached to maleated polyethylene as amides formed from secondary amines are significantly less stable than imides formed from primary amines.N-methylaniline amide-derivatives of maleated polyethylene undergo significant decomposition at 160℃ and substantial decomposition at 200℃.In contrast,the imides (except aniline imide) derivatives of maleated polyethylene are stable for long periods of time at 160℃,and the decomposition of phenethylamine imide-,9-aminomethylphenanthrene imide-derivatives is initiated slowly at 255℃ and 280℃,respectively.The effect of different modified groups on thermal stability of the polymers was discussed based on the qualitative and quantitative determination of the products.The thermal degradation pathways for the above chemically modified polyethylene were suggested.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
文摘The thermal decomposition behaviors of four chemically modified polyethylene were investigated by high resolution pyrolysis gas chromatography\|mass spectrometry (HR PyGC-MS).The results revealed that substituents attached to maleated polyethylene as amides formed from secondary amines are significantly less stable than imides formed from primary amines.N-methylaniline amide-derivatives of maleated polyethylene undergo significant decomposition at 160℃ and substantial decomposition at 200℃.In contrast,the imides (except aniline imide) derivatives of maleated polyethylene are stable for long periods of time at 160℃,and the decomposition of phenethylamine imide-,9-aminomethylphenanthrene imide-derivatives is initiated slowly at 255℃ and 280℃,respectively.The effect of different modified groups on thermal stability of the polymers was discussed based on the qualitative and quantitative determination of the products.The thermal degradation pathways for the above chemically modified polyethylene were suggested.
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.
