为了获得热稳定、阻燃和力学性能均较好的复合材料,以高密度聚乙烯/乙烯-醋酸乙烯酯(HDPE/EVA)共混物为基体,可膨胀石墨(EG)作为无卤阻燃剂,通过熔融共混方法制备了HDPE/EVA/EG阻燃复合材料.采用热重分析(TGA)、锥形量热仪、电子扫描电...为了获得热稳定、阻燃和力学性能均较好的复合材料,以高密度聚乙烯/乙烯-醋酸乙烯酯(HDPE/EVA)共混物为基体,可膨胀石墨(EG)作为无卤阻燃剂,通过熔融共混方法制备了HDPE/EVA/EG阻燃复合材料.采用热重分析(TGA)、锥形量热仪、电子扫描电镜(SEM)等方法研究了钛酸酯偶联剂改性前后EG对复合材料的热稳定性能、阻燃性能以及力学性能的影响.研究结果表明,EG能提高聚合物基体材料的热稳定性能和阻燃性能,但力学性能降低;用钛酸酯偶联剂对EG改性后,HDPE/EVA/EG复合材料的断裂伸长率从232.3%提高到315.3%,拉伸强度由9.0 MPa增到了10.0 MPa,冲击强度由88 k J/m2提高到129 k J/m2.偶联剂的存在提高了EG与基体间的界面粘结力,使阻燃复合材料的综合力学性能得到改善.展开更多
Carbon fiber oxidized by KMnO4 was combined with ethylene vinyl acetate（EVA） copolymer,the obtained composite shows a fine stability of thermal cycles and nearly unchanged switching temperature under thermal（cycles...Carbon fiber oxidized by KMnO4 was combined with ethylene vinyl acetate（EVA） copolymer,the obtained composite shows a fine stability of thermal cycles and nearly unchanged switching temperature under thermal（cycles）,at the same time negative temperature coefficient（NTC） phenomenon is eliminated.Solvent-extraction method is used to examine the interaction between EVA and CF and insolublity with the gel structure were found.The crosslinking network in the gel adsorb CF intensely which makes CF disperse in EVA uniformly,orientate consistently,combine with EVA tightly and shows the elimination of NTC phenomenon.The（switching） temperature of the composite in the heating process is not identical with that of the composite in the cooling process absolutely,but the temperatures in the above two processes are consistent with the outset of melting temperature and the end of crystallization temperature respectively.展开更多
文摘为了获得热稳定、阻燃和力学性能均较好的复合材料,以高密度聚乙烯/乙烯-醋酸乙烯酯(HDPE/EVA)共混物为基体,可膨胀石墨(EG)作为无卤阻燃剂,通过熔融共混方法制备了HDPE/EVA/EG阻燃复合材料.采用热重分析(TGA)、锥形量热仪、电子扫描电镜(SEM)等方法研究了钛酸酯偶联剂改性前后EG对复合材料的热稳定性能、阻燃性能以及力学性能的影响.研究结果表明,EG能提高聚合物基体材料的热稳定性能和阻燃性能,但力学性能降低;用钛酸酯偶联剂对EG改性后,HDPE/EVA/EG复合材料的断裂伸长率从232.3%提高到315.3%,拉伸强度由9.0 MPa增到了10.0 MPa,冲击强度由88 k J/m2提高到129 k J/m2.偶联剂的存在提高了EG与基体间的界面粘结力,使阻燃复合材料的综合力学性能得到改善.
文摘Carbon fiber oxidized by KMnO4 was combined with ethylene vinyl acetate（EVA） copolymer,the obtained composite shows a fine stability of thermal cycles and nearly unchanged switching temperature under thermal（cycles）,at the same time negative temperature coefficient（NTC） phenomenon is eliminated.Solvent-extraction method is used to examine the interaction between EVA and CF and insolublity with the gel structure were found.The crosslinking network in the gel adsorb CF intensely which makes CF disperse in EVA uniformly,orientate consistently,combine with EVA tightly and shows the elimination of NTC phenomenon.The（switching） temperature of the composite in the heating process is not identical with that of the composite in the cooling process absolutely,but the temperatures in the above two processes are consistent with the outset of melting temperature and the end of crystallization temperature respectively.
