模压条件对聚乙烯/碳黑PTC复合材料电阻特性的影响

The influence of mold pressing parameters on the room temperature electrical resistance of high density polyethylene/carbon black composites was investigated in this paper.The low room temperature electrical resistance of the composites can be obtained under the mold pressing parameters:mold pressing pressure 6～14 MPa,temperature 150～160℃,mold pressing time 15～30 minutes and the time of molded specimen cooling to room temperature for 30 minutes.The positive temperature coefficient effect of the sample prepared under optimized mold pressing parameters is 7.7,while the negative temperature coefficient effect is only 0.9.The thermal analysis and the microstructure of the samples can be analyzed using the DSC and SEM respectively.

树脂基复合材料模压成型用BH315-3D温度场采集系统

针对复合材料模压成型过程的工艺特性 ,本文研制了一套温度场采集系统。该系统具有采集速度快、灵敏度高、自动化程度高的特点 ,能够直观、实时地显示复合材料模压成型过程中片层内部温度 时间 位置三维分布图 。

竹纤维增强聚己内酯复合材料制备工艺

将竹纤维(BF)和聚己内酯(PCL)熔融共混模压制备竹纤维增强聚己内酯(BF/PCL)复合材料,采用硅烷偶联剂(KH560)做界面调控。结合力学、红外、扫描电镜及凝胶色谱等分析检测,确定最佳偶联剂用量和最佳模压温度。结果表明:偶联剂用量为1%(占纤维绝干重量)时,复合材料力学性能较佳,冲击、拉伸强度和断裂伸长率分别为13.72 kJ/m^2,12.71 MPa和6.28%;模压温度为90℃时,复合材料的冲击、拉伸强度及断裂伸长率分别达到15.02 kJ/m^2、14.21 MPa和7.21%,力学性能优良。