It is reported report herein the synthesis and characterization of a new mesogen-jacketed polymer containing an electron deficient oxadiazole unit __ poly{2,5-bis[(5-tert-butylphenyl)-1,3,4-oxadiazole]styrene} (BBPOS)...It is reported report herein the synthesis and characterization of a new mesogen-jacketed polymer containing an electron deficient oxadiazole unit __ poly{2,5-bis[(5-tert-butylphenyl)-1,3,4-oxadiazole]styrene} (BBPOS).BBPOS can be dissolved in THE,CHCl-3,xylene,and DMSO.The structure of the monomer and the polymer was confirmed by elemental analysis,NMR,MS and GPC.The optical and electronic properties of the polymer were investigated by UV-Vis absorption spectroscopy and photoluminescence spectroscopy.The results show that the polymer films emit greenish-blue light (λ max =390 nm) upon UV excitation.Thermo-analysis showed that the glass-transition temperature of the polymer is at 117℃.Moreover,its weight loss was less than 5% on heating to about 349℃ under nitrogen atmosphere.展开更多
Monodisperse polystyrene microspheres are prepared by shell porous glass(SPG)\|suspension polymerization. The influences of SPG on size and size dispersity of the microspheres are investigated. The properties of the m...Monodisperse polystyrene microspheres are prepared by shell porous glass(SPG)\|suspension polymerization. The influences of SPG on size and size dispersity of the microspheres are investigated. The properties of the microspheres are studied by GPC, TEM and SEM. The results indicate that the polystyrene microspheres possess definite monodispersibity and their particle size is in the range of 5～12?μm.展开更多
A series of monomers {2,5-bis[(5-alkyl-phenyl)-1,3,4-oxadiazole] styrene}(BOXE) were designed and synthesized.By radical polymerization initiated BPO with a novel series of mesogen-jacketed polymers containing 1,3,4-o...A series of monomers {2,5-bis[(5-alkyl-phenyl)-1,3,4-oxadiazole] styrene}(BOXE) were designed and synthesized.By radical polymerization initiated BPO with a novel series of mesogen-jacketed polymers containing 1,3,4-oxadiazole were prepared.Molecular weight and molecular weight distribution of polymers were measured by GPC.The glass transition temperature (T_g) and thermal stability of polymers were studied by DSC and TGA.The results indicate that these polymers have good thermal stability.These liquid crystal polymers have well defined structure,and possess special photo-electronic properties.展开更多
文摘It is reported report herein the synthesis and characterization of a new mesogen-jacketed polymer containing an electron deficient oxadiazole unit __ poly{2,5-bis[(5-tert-butylphenyl)-1,3,4-oxadiazole]styrene} (BBPOS).BBPOS can be dissolved in THE,CHCl-3,xylene,and DMSO.The structure of the monomer and the polymer was confirmed by elemental analysis,NMR,MS and GPC.The optical and electronic properties of the polymer were investigated by UV-Vis absorption spectroscopy and photoluminescence spectroscopy.The results show that the polymer films emit greenish-blue light (λ max =390 nm) upon UV excitation.Thermo-analysis showed that the glass-transition temperature of the polymer is at 117℃.Moreover,its weight loss was less than 5% on heating to about 349℃ under nitrogen atmosphere.
文摘Monodisperse polystyrene microspheres are prepared by shell porous glass(SPG)\|suspension polymerization. The influences of SPG on size and size dispersity of the microspheres are investigated. The properties of the microspheres are studied by GPC, TEM and SEM. The results indicate that the polystyrene microspheres possess definite monodispersibity and their particle size is in the range of 5～12?μm.
文摘A series of monomers {2,5-bis[(5-alkyl-phenyl)-1,3,4-oxadiazole] styrene}(BOXE) were designed and synthesized.By radical polymerization initiated BPO with a novel series of mesogen-jacketed polymers containing 1,3,4-oxadiazole were prepared.Molecular weight and molecular weight distribution of polymers were measured by GPC.The glass transition temperature (T_g) and thermal stability of polymers were studied by DSC and TGA.The results indicate that these polymers have good thermal stability.These liquid crystal polymers have well defined structure,and possess special photo-electronic properties.
