【摘要】 在不添加相容剂的情况下,将PA6与不同质量分数的热致聚酰胺液晶(TLCP)在Haake转矩流变仪上共混得到PA6/TLCP复合材料,并对其相形态、拉伸性能及断面形貌进行了表征。由于TLCP的分子与PA6分子之间的相互作用,添加少量的TLCP(w(TLCP)≤10%)可以与尼龙直接增容,而不出现相分离的现象。加入质量分数为5%的TLCP,复合材料的拉伸强度较纯PA6提高了5.2%,弹性模量提高38.3%,断裂伸长率提高逾280%,拉伸断面形貌出现明显的"脆-韧"转变。但TLCP的质量分数进一步增加到15%时,因为TLCP无法进一步有效地分散到PA6的内部而发生自团聚,形成应力点和相分离,复合材料的力学性能呈下降趋势,故加入适当的TLCP可以有助于提高共混物的韧性,并保持拉伸模量。更多还原

【Abstract】 With the view of improving the properties of PA6,different contents of thermal liquid crystalline polyamide were blended with PA6 without any compatibilizer to fabricate PA6/TLCP composites by means of the Haake Rheometer.Phase behaviour,tensile properties and fracture morphology were studied.It was compatibilized directly and without phase separation when the addition of TLCP less than 10%.Addition of 5% TLCP in PA6 increased the tensile strength by 5.2%,Young’s modulus by 38.3%,and elongation at break by 280% as compared with pure PA6.Simultaneously,the morphology was typical ductile rupture.As the addition of TLCP in PA6 beyond 15%,it was difficult for particles of TLCP to be dispersed thoroughly in PA6 matrix,which induced the self-congregations and phase separation of TLCP along with the typical transition from tough to brittle detected by SEM resulted in the dramatic drop in mechanical properties.Addition of appropriate content of TLCP favored improvement in toughness of PA6/TLCP composites without the expense of tensile modulus.更多还原