Poly(ethylene methyl phosphate)-poly(ethylene glycol)-poly(ethylene methyl phosphate) triblock copolymers carrying hydroxyl group at both chain ends were synthesized with sodium poly(ethylene glycol)ate as initiator. ...Poly(ethylene methyl phosphate)-poly(ethylene glycol)-poly(ethylene methyl phosphate) triblock copolymers carrying hydroxyl group at both chain ends were synthesized with sodium poly(ethylene glycol)ate as initiator. The effects of the factors such as solvent, amount of the initiator and reaction time were investigated. The copolymers were characterized by IR, H-1-NMR, H-1{P-31}-NMR, C-13-NMR, P-31{H-1}-NMR, and DSC. High molecular weight of the copolymer and high yield of the polymerization were achieved within 3 min at 25 degrees C. The polymerization process was studied by P-31{H-1}-NMR and transesterification was found during longer polymerization time.展开更多
The influence of different poly（ethylene glycol） alkyl ethers（CnH2n＋1O（C2H4O）mH, CnEm） on flotation of carbonaceous copper shale mixed with quartz as a gangue mineral was investigated. The results show that all...The influence of different poly（ethylene glycol） alkyl ethers（CnH2n＋1O（C2H4O）mH, CnEm） on flotation of carbonaceous copper shale mixed with quartz as a gangue mineral was investigated. The results show that all of the ethers C4E1, C4E2, C4E3, C2E2, C6E2 investigated can be used for the flotation of carbonaceous copper shale. The best selectivity of separation in the flotation of the carbonaceous copper shale and quartz mixture is obtained with the C4E2 and C2E2 ethers. The obtained data can be used for developing separation of organic carbon present in carbonaceous shale at a rougher flotation stage on an industrial scale.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（ether urethane）s （PEU）, including PEUI 15 and PEUH15, were prepared through chain-extension reaction of poly（ethylene glycol） （PEG-1500） using diisocyanate as a chain extender, including isophorone diisoc...Poly（ether urethane）s （PEU）, including PEUI 15 and PEUH15, were prepared through chain-extension reaction of poly（ethylene glycol） （PEG-1500） using diisocyanate as a chain extender, including isophorone diisocyanate （IPDI） and hexamethylene diisocyanate （HDI）. These PEUs were used to toughen polylactide （PLA） by physical and reactive blending. Thermal, morphological, mechanical and aging properties of the blends were investigated in detail. These PEUs were partially compatible with PLA. The elongation at break of the reactive blends in the presence of triphenyl phosphate （TPP） for PLA with PEUH15 or PEUI15 was much higher than that of the physical blends. The aging test was carried out at -20 ~C for 50 h in order to accelerate the crystallization of PEUs. The PEUs in the PLA/PEU blends produced crystallization and formed new phase separation with PLA, resulting in the declined toughness of blends. Fortunately, under the aging condition, although PEUH15 in blends could also form crystallization, the reactive blend of PLA/PEUH15/TPP（80/20/2） bad higher toughness than the other blends. The elongation at break of PLA/PEUH 15/TPP（80/20/2） dropped to 287% for the aging blend from 350% for the original blend. The tensile strength and modulus of PLA/PEUH15/TPP blend did not change obviously because of the crystallization of PEUH 15.展开更多
基金Supported by the National Natural Science Foundation of China.
文摘Poly(ethylene methyl phosphate)-poly(ethylene glycol)-poly(ethylene methyl phosphate) triblock copolymers carrying hydroxyl group at both chain ends were synthesized with sodium poly(ethylene glycol)ate as initiator. The effects of the factors such as solvent, amount of the initiator and reaction time were investigated. The copolymers were characterized by IR, H-1-NMR, H-1{P-31}-NMR, C-13-NMR, P-31{H-1}-NMR, and DSC. High molecular weight of the copolymer and high yield of the polymerization were achieved within 3 min at 25 degrees C. The polymerization process was studied by P-31{H-1}-NMR and transesterification was found during longer polymerization time.
基金support by the National Science Centre Research Grant (2012/07/D/ST8/02622)a fellowships financed by the Foundation for Polish Science (FNP)the European Union within the European Social Fund
文摘The influence of different poly（ethylene glycol） alkyl ethers（CnH2n＋1O（C2H4O）mH, CnEm） on flotation of carbonaceous copper shale mixed with quartz as a gangue mineral was investigated. The results show that all of the ethers C4E1, C4E2, C4E3, C2E2, C6E2 investigated can be used for the flotation of carbonaceous copper shale. The best selectivity of separation in the flotation of the carbonaceous copper shale and quartz mixture is obtained with the C4E2 and C2E2 ethers. The obtained data can be used for developing separation of organic carbon present in carbonaceous shale at a rougher flotation stage on an industrial scale.
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(Nos.51573178,51390480,51203155,51403199 and 51303176)the National High Technology Research and Development Program("863" Program) of China(No.2015AA034004)
文摘Poly（ether urethane）s （PEU）, including PEUI 15 and PEUH15, were prepared through chain-extension reaction of poly（ethylene glycol） （PEG-1500） using diisocyanate as a chain extender, including isophorone diisocyanate （IPDI） and hexamethylene diisocyanate （HDI）. These PEUs were used to toughen polylactide （PLA） by physical and reactive blending. Thermal, morphological, mechanical and aging properties of the blends were investigated in detail. These PEUs were partially compatible with PLA. The elongation at break of the reactive blends in the presence of triphenyl phosphate （TPP） for PLA with PEUH15 or PEUI15 was much higher than that of the physical blends. The aging test was carried out at -20 ~C for 50 h in order to accelerate the crystallization of PEUs. The PEUs in the PLA/PEU blends produced crystallization and formed new phase separation with PLA, resulting in the declined toughness of blends. Fortunately, under the aging condition, although PEUH15 in blends could also form crystallization, the reactive blend of PLA/PEUH15/TPP（80/20/2） bad higher toughness than the other blends. The elongation at break of PLA/PEUH 15/TPP（80/20/2） dropped to 287% for the aging blend from 350% for the original blend. The tensile strength and modulus of PLA/PEUH15/TPP blend did not change obviously because of the crystallization of PEUH 15.
