Degradable graft copolymers of vinyl acetate and sericin were prepared firstly. Their structures, mechanical and biodegradable properties, and thermal stability were examined by IR, TG and the tensile machine.The resu...Degradable graft copolymers of vinyl acetate and sericin were prepared firstly. Their structures, mechanical and biodegradable properties, and thermal stability were examined by IR, TG and the tensile machine.The results indicate that the graft copolymers prepared have higher tensile strength, Youngs modulus, elongation, thermostability and degradation rate than poly(vinyl acetate).展开更多
Coordination compounds of lanthanide trichloroacetates with 1,10-phenanthroline were synthesized and characterized as Ln(CCl_3COO)_3·(phen)_2·2H_2O(phen=1,10-phenanthroline,Ln=Tb~ Lu)by chemical analysis,IR...Coordination compounds of lanthanide trichloroacetates with 1,10-phenanthroline were synthesized and characterized as Ln(CCl_3COO)_3·(phen)_2·2H_2O(phen=1,10-phenanthroline,Ln=Tb~ Lu)by chemical analysis,IR spectra,thermal analysis and crystal X-ray structural analysis.The crystal of Er(CCl_3COO)_3·(phen)_2·2H_2O belongs to monoclinic system,with space group P2_1/c,a=1.6969(6)nm, b=1.3776(5)nm,c=1.7563(9)nm,β=114.79(9)°,V=3.727(1)nm^3,Z=4.展开更多
文摘Degradable graft copolymers of vinyl acetate and sericin were prepared firstly. Their structures, mechanical and biodegradable properties, and thermal stability were examined by IR, TG and the tensile machine.The results indicate that the graft copolymers prepared have higher tensile strength, Youngs modulus, elongation, thermostability and degradation rate than poly(vinyl acetate).
基金This project was supported by the National Natured Science Foundation of China
文摘Coordination compounds of lanthanide trichloroacetates with 1,10-phenanthroline were synthesized and characterized as Ln(CCl_3COO)_3·(phen)_2·2H_2O(phen=1,10-phenanthroline,Ln=Tb~ Lu)by chemical analysis,IR spectra,thermal analysis and crystal X-ray structural analysis.The crystal of Er(CCl_3COO)_3·(phen)_2·2H_2O belongs to monoclinic system,with space group P2_1/c,a=1.6969(6)nm, b=1.3776(5)nm,c=1.7563(9)nm,β=114.79(9)°,V=3.727(1)nm^3,Z=4.