共聚PA6/66在PA66/GF复合材料中的应用

Application of Polyamide 6/66 Copolymer on Glass Fiber Reinforced Polyamide 66 Composites

以共聚尼龙(PA)6/66和POE-g-MAH作为增韧剂,采用熔融共混法对PA66/玻璃纤维(GF)复合材料进行增韧改性,考察两种增韧剂用量对其结晶行为、力学性能、热变形温度(HDT)和熔体流动速率(MFR)的影响。结果表明,高用量的POE-g-MAH对复合材料中PA66的结晶有一定阻碍作用,而共聚PA6/66对PA66的结晶性能影响较小;随着共聚PA6/66和POE-g-MAH用量的提高,PA66/GF复合材料的冲击强度明显提高,拉伸强度、弯曲强度和HDT则逐渐下降;与POE-g-MAH相比,共聚PA6/66对拉伸及弯曲强度和HDT的不利影响较小,且略微提高了复合材料的MFR,而POE-g-MAH大幅降低了复合材料的MFR。当两种增韧剂的质量分数均为12%时,共聚PA6/66和POE-g-MAH增韧的复合材料的无缺口冲击强度和缺口冲击强度基本相当,但前者在拉伸强度、弯曲强度、HDT和MFR方面均有更明显的优势。

Polyamide（PA） 6 / 66 copolymer and POE-g-MAH were used to improve the toughness of glass fiber （GF） reinforced PA66 composites by melt blending. The effects of the two toughening agent Content on the crystallization behaviors, mechanical properties, heat deformation temperature （HDT） and melt flow rate （MFR） of the composites were studied. The results show that the crystallization of PA66 in the composites is baffled by POE-g-MAH with high content, while the PA6 / 66 copolymer has slight influence on the crystallization of PA66. With the increase of the two toughening agent content, the impact strength of the composite increases, but the tensile strength, flexural strength and HDT decrease. Compared with POE-g-MAH, the adverse effects of the PA6 / 66 copolymer on the tensile, flexural strength and HDT are lesser and increase MFR of the composite slightly, but POE- g-MAH decreases the MFR greatly. When the mass fraction of the two toughening agent is 12% respectively, the un-notched and notched impact strength of the composite toughened by the PA6 / 66 copolymer are equivalent to those of the composite toughened by POE-g-MAH, but the former composite has more obvious advantages in the aspects of tensile strength, flexural strength, HDT and MFR.