采用非等温差示扫描量热法(DSC)测试了不同升温速率下,聚苯并口恶嗪及聚苯并口恶嗪/炭纤维复合材料的固化过程。分析了不同升温速率下,两体系的特征固化温度、反应热及反应速率与温度的关系。K iss inger方程分析计算了聚苯并口恶嗪及...采用非等温差示扫描量热法(DSC)测试了不同升温速率下,聚苯并口恶嗪及聚苯并口恶嗪/炭纤维复合材料的固化过程。分析了不同升温速率下,两体系的特征固化温度、反应热及反应速率与温度的关系。K iss inger方程分析计算了聚苯并口恶嗪及聚苯并口恶嗪/炭纤维复合材料的固化反应表观活化能和反应级数。结果表明,炭纤维对聚苯并口恶嗪固化具有催化作用,同时又有缓聚作用。浅析了炭纤维影响聚苯并口恶嗪固化的原因。展开更多
PLA/MWNT/HA hybrid nanofibers were prepared via electrospinning technology.Multi walled carbon nanotube (MWNT) were first treated by anodic oxidation,which resulted in various functional groups such as C—O,CO and O—...PLA/MWNT/HA hybrid nanofibers were prepared via electrospinning technology.Multi walled carbon nanotube (MWNT) were first treated by anodic oxidation,which resulted in various functional groups such as C—O,CO and O—CO on the surface of oxidized MWNT.Then the MWNT/hydroxyapatite (HA) nano composites (MWNT content 3?wt%) were in situ synthesized by wet method with the help of ultrasonic treatment.Because of the strong interaction between the functional groups on the surface of MWNT and Ca 2+ in HA,the obtained HA nano particles were deposited onto the surface of oxidized MWNT.The as received MWNT/HA nano composites with excellent biocompatibility and osteoinduction were introduced into a bioabsorbable polymer,polylactide (PLA),and the PLA/MWNT/HA hybrid nanofibers were electrospun through a double solvent method under the voltage of 18 kV and the capillary to target distance was 4?cm.The structure and morphology of hybrid nanofibers were characterized by SEM.Because of the nanoscaled diameters,microscaled interconnected pores and suitable surface chemistry,the hybrid nanofibers would match the requirements of ideal bone tissue engineering scaffold and may be a potential material for preparing bone tissue engineering scaffold.展开更多
文摘采用非等温差示扫描量热法(DSC)测试了不同升温速率下,聚苯并口恶嗪及聚苯并口恶嗪/炭纤维复合材料的固化过程。分析了不同升温速率下,两体系的特征固化温度、反应热及反应速率与温度的关系。K iss inger方程分析计算了聚苯并口恶嗪及聚苯并口恶嗪/炭纤维复合材料的固化反应表观活化能和反应级数。结果表明,炭纤维对聚苯并口恶嗪固化具有催化作用,同时又有缓聚作用。浅析了炭纤维影响聚苯并口恶嗪固化的原因。
文摘PLA/MWNT/HA hybrid nanofibers were prepared via electrospinning technology.Multi walled carbon nanotube (MWNT) were first treated by anodic oxidation,which resulted in various functional groups such as C—O,CO and O—CO on the surface of oxidized MWNT.Then the MWNT/hydroxyapatite (HA) nano composites (MWNT content 3?wt%) were in situ synthesized by wet method with the help of ultrasonic treatment.Because of the strong interaction between the functional groups on the surface of MWNT and Ca 2+ in HA,the obtained HA nano particles were deposited onto the surface of oxidized MWNT.The as received MWNT/HA nano composites with excellent biocompatibility and osteoinduction were introduced into a bioabsorbable polymer,polylactide (PLA),and the PLA/MWNT/HA hybrid nanofibers were electrospun through a double solvent method under the voltage of 18 kV and the capillary to target distance was 4?cm.The structure and morphology of hybrid nanofibers were characterized by SEM.Because of the nanoscaled diameters,microscaled interconnected pores and suitable surface chemistry,the hybrid nanofibers would match the requirements of ideal bone tissue engineering scaffold and may be a potential material for preparing bone tissue engineering scaffold.
