以聚硫橡胶、乙二胺为原料合成了新的环氧树脂固化剂（简称DAJL）,通过力学性能测试研究了其用量对环氧固化产物性能的影响。结果表明,随着DAJL用量的增加,环氧树脂固化物的拉伸强度、弯曲强度均有所下降,冲击强度先增大后减小,当DAJL...以聚硫橡胶、乙二胺为原料合成了新的环氧树脂固化剂（简称DAJL）,通过力学性能测试研究了其用量对环氧固化产物性能的影响。结果表明,随着DAJL用量的增加,环氧树脂固化物的拉伸强度、弯曲强度均有所下降,冲击强度先增大后减小,当DAJL的质量分数为20%时,冲击强度达到最大（3.50 k J/m^2）,韧性较好,同时其他力学强度较高。冲击端口的SEM照片表明,DAJL固化剂的加入可以引发银纹,吸收冲击能,终止裂纹扩散。展开更多
Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame retardancy.The results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP ...Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame retardancy.The results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP increased the limited oxygen index(LOI)from 21.8%to 32.2%,hence meeting UL 94 V-0 rating.The thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous char.The decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy(TG-FTIR),and the release of large amounts of phosphorus was detected in the gas phase.The evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/GNS.The latter was further confirmed by digital photography and scanning electron microscopy(SEM).Also,Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during combustion.Overall,the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.展开更多
文摘以聚硫橡胶、乙二胺为原料合成了新的环氧树脂固化剂（简称DAJL）,通过力学性能测试研究了其用量对环氧固化产物性能的影响。结果表明,随着DAJL用量的增加,环氧树脂固化物的拉伸强度、弯曲强度均有所下降,冲击强度先增大后减小,当DAJL的质量分数为20%时,冲击强度达到最大（3.50 k J/m^2）,韧性较好,同时其他力学强度较高。冲击端口的SEM照片表明,DAJL固化剂的加入可以引发银纹,吸收冲击能,终止裂纹扩散。
基金financially supported by the special funding of Guiyang Science and Technology Bureau and Guiyang University (No. GYU-KYZ201803-1)Major Construction Project of Firstrate University in Guizhou Provice (No. 2017158134)
文摘Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame retardancy.The results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP increased the limited oxygen index(LOI)from 21.8%to 32.2%,hence meeting UL 94 V-0 rating.The thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous char.The decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy(TG-FTIR),and the release of large amounts of phosphorus was detected in the gas phase.The evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/GNS.The latter was further confirmed by digital photography and scanning electron microscopy(SEM).Also,Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during combustion.Overall,the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.
