ZnO and metal hydroxides as flame-retardants and smoke suppressants for flexible poly(vinyl chloride) were studied.The thermal degradation in air of flexible PVC treated with flame-retardants ZnO and metal hydroxides ...ZnO and metal hydroxides as flame-retardants and smoke suppressants for flexible poly(vinyl chloride) were studied.The thermal degradation in air of flexible PVC treated with flame-retardants ZnO and metal hydroxides was studied with differential thermal analysis and thermogravimetry from ambient temperature to 1073 K.The kinetic parameters were obtained by using the equation of Kissinger, Broido and Vyazovkin.Their mechanisms were studied through comparing the thermal behavior with the flame retardant properties of the samples.The results showed that the flame retardant properties of the samples treated with ZnO and metal hydroxides were related to the thermal behavior of the samples.Metal hydroxides enhanced the activation energy of degradation and the flame retardant properties of the samples through endothermic dehydration.ZnO might act in the condensed phase as a Lewis acid.展开更多
A new preparation method of the sustained-releasing microspheres containing acetamiprid was developed with carboxymethyl chitosan and acacia as base materials.The preparation condition were optimized using L16(45) ort...A new preparation method of the sustained-releasing microspheres containing acetamiprid was developed with carboxymethyl chitosan and acacia as base materials.The preparation condition were optimized using L16(45) orthogonal experimental design with the drug encapsulation and the shape of the microspheres as criteria.As a result,the optimum preparation conditions of the microspheres were as follows:the concentration ratio of carboxymethyl chitosan to acacia was 1∶3,the dosage of acetamiprid was 1.0 g,the amount of 10 % glutaraldehyde was 16mL.The complex coacervation reation was conducted at 45 ℃ for 80min.The experimental results showed that there were no chemical interactions between acetamiprid and the carboxymethyl chitosan/acacia complex and a good drug releasing performances of the acetamiprid microspheres was obtained.展开更多
以正硅酸乙酯(TEOS)及3-氨基丙基三乙氧基硅烷(ATOS)为原料,采用溶胶-凝胶法对聚磷酸铵(APP)进行了表面改性并用于阻燃环氧树脂。结果表明:TEOS及ATOS通过水解、聚合反应在改性APP(MAPP)表面生成了一层致密且类似荷叶表面微-纳米结构的...以正硅酸乙酯(TEOS)及3-氨基丙基三乙氧基硅烷(ATOS)为原料,采用溶胶-凝胶法对聚磷酸铵(APP)进行了表面改性并用于阻燃环氧树脂。结果表明:TEOS及ATOS通过水解、聚合反应在改性APP(MAPP)表面生成了一层致密且类似荷叶表面微-纳米结构的聚硅氧烷膜,MAPP的溶解度由0.62降低为0.18 g/100 m L水,疏水性及耐水性明显增强。展开更多
文摘ZnO and metal hydroxides as flame-retardants and smoke suppressants for flexible poly(vinyl chloride) were studied.The thermal degradation in air of flexible PVC treated with flame-retardants ZnO and metal hydroxides was studied with differential thermal analysis and thermogravimetry from ambient temperature to 1073 K.The kinetic parameters were obtained by using the equation of Kissinger, Broido and Vyazovkin.Their mechanisms were studied through comparing the thermal behavior with the flame retardant properties of the samples.The results showed that the flame retardant properties of the samples treated with ZnO and metal hydroxides were related to the thermal behavior of the samples.Metal hydroxides enhanced the activation energy of degradation and the flame retardant properties of the samples through endothermic dehydration.ZnO might act in the condensed phase as a Lewis acid.
文摘A new preparation method of the sustained-releasing microspheres containing acetamiprid was developed with carboxymethyl chitosan and acacia as base materials.The preparation condition were optimized using L16(45) orthogonal experimental design with the drug encapsulation and the shape of the microspheres as criteria.As a result,the optimum preparation conditions of the microspheres were as follows:the concentration ratio of carboxymethyl chitosan to acacia was 1∶3,the dosage of acetamiprid was 1.0 g,the amount of 10 % glutaraldehyde was 16mL.The complex coacervation reation was conducted at 45 ℃ for 80min.The experimental results showed that there were no chemical interactions between acetamiprid and the carboxymethyl chitosan/acacia complex and a good drug releasing performances of the acetamiprid microspheres was obtained.
文摘以正硅酸乙酯(TEOS)及3-氨基丙基三乙氧基硅烷(ATOS)为原料,采用溶胶-凝胶法对聚磷酸铵(APP)进行了表面改性并用于阻燃环氧树脂。结果表明:TEOS及ATOS通过水解、聚合反应在改性APP(MAPP)表面生成了一层致密且类似荷叶表面微-纳米结构的聚硅氧烷膜,MAPP的溶解度由0.62降低为0.18 g/100 m L水,疏水性及耐水性明显增强。
