【摘要】 尼龙6(PA6)虽有很多优良的性能,但由于它具有强极性的特点,使其吸水率高,尺寸稳定性和电性能差。同时,由于PA6材料在干态和低温下脆性大、冲击强度差,导致材料使用寿命缩短,这些缺陷都极大地限制了它的应用。本研究采用液晶聚合物(TLCP)对PA6进行改性,使其在加工过程中形成原位复合材料,同时为了改善液晶聚合物与PA6的相容性,还加入了相容剂。实验证明,在PA6/TL-CP复合材料中,液晶聚合物的加入使复合材料的拉伸强度、冲击强度、弯曲强度以及热变形温度都有提高而吸水率下降,当TLCP质量分数为4%时,PA6/TLCP复合材料综合性能最好。DSC实验表明,随着液晶聚合物的加入,复合材料的熔融温度稍有增加。SEM显示,液晶在复合材料中以微纤的形态存在,而且是沿着纤维轴方向取向。POE-g-MAH作为相容剂加入,改善了液晶聚合物与尼龙之间的界面粘合性能。更多还原

【Abstract】 The effect of the blend ratio of PA6/TLCP on properties of in-situ composite was investigated.The results showed that the tensile strength,the flexural strength,the flexural modulus,water absorption properties and the heat distortion temperature of PA6/TLCP were enhanced with the increasing of TLCP content.The elongation at break and the notched impact strength were maximal when the TLCP content was 4%.The melting viscosity of in-situ composites decreased with TLCP adding.The melting temperature(Tm) enhanced with TLCP adding.SEM showed that TLCP micro-fibrils were formed on the profile of extrusion sample. POE-g-MAH as a compatibilizer was added into the composites in order to modify the miscibility between PA6 and TLCP.SEM showed that the impact fracture surface was broken in toughness,TLCP micro-fibrils were better dispersed with POE-g-MAH adding.更多还原