PA12T/SGF复合材料的制备及性能

Preparation and Properties of PA12T/SGF Composites

采用双螺杆挤出机制备了不同短切玻璃纤维(SGF)含量的聚对苯二甲酰十二碳二元胺(PA12T)/SGF复合材料(PA12T/SGF),研究了SGF含量对其分散性及最终复合材料力学性能、吸水率、动态力学性能的影响。结果表明,随着SGF含量的增加,复合材料的拉伸强度、弯曲强度、缺口冲击强度、硬度(邵D)不断提高,而断裂伸长率、吸水率不断降低。当SGF含量达到30%时,复合材料的拉伸强度、弯曲强度、缺口冲击强度分别为176MPa,181MPa,9.5kJ/m2,相比纯PA12T分别提高1.17倍、2.12倍、1.02倍;断裂伸长率为23%,降低至纯PA12T的46%;吸水率为0.78%,相比纯PA12T降低21.2%。扫描电子显微镜(SEM)分析结果表明,SGF在复合材料中分散较均匀。动态力学分析结果表明,随着SGF含量的增加,复合材料的刚性增大,韧性降低。

Poly(dodecamethylene terephthalamide)(PA12T)/short-cut glass fiber (PA12T/SGF) composites with different SGF content were prepared by the twin-screw extruder. The effects of SGF content on its dispersibility and the mechanical properties, water absorption,dynamic mechanical properties of the composites were researched. The results show that with the increase of SGF content,the tensile strength,flexural strength,notched impact strength and shore hardness (D) of the composites are continuously improved,while the elongation at break and water absorption are decreased. When the SGF content reaches 30%,the tensile strength,flexural strength and notched impact strength of the composite are 176 MPa,181 MPa and 9.5 kJ/m^2,respectively, which are increased by 1.17 times,2.12 times and 2.02 times compared with the pure PA12T. The elongation at break is 23%,which is 46% of the pure PA12T. The water absorption is 0.78%,which is 21.2% lower than that of pure PA12T. Scanning electron microscopy (SEM) results show that the SGFs are uniformly dispersed in the composite. Dynamic mechanical analysis (DMA) results show that the rigidity of the composite increase,while the toughness decreases,with the increase of SGF content.