PPO增韧生物基PA56合金的制备及性能

Preparation and Properties of PPO Toughened Bio⁃Based PA56 Alloy

以有机刚性粒子PPO为增韧剂,采用熔融共混的方法对PA56进行增韧改性,制得PA56/PPO合金。研究结果表明,PA56/PPO合金样品断面形貌呈现典型的海-岛结构,PPO以球状颗粒的形态均匀地分布在PA56连续相中,相畴尺寸为100~300 nm。PA56/PPO合金的力学性能测试表明,随着PPO含量的增加,简支梁缺口冲击强度增强,断裂伸长率提高,当PPO质量分数为30%时,PA56/PPO合金的冲击强度为9.4 kJ/m^(2),断裂伸长率为20.5%,与纯PA56相比,分别提高了303%和820%;但是,合金的拉伸强度变化较小。当PPO质量分数为30%,PA56/PPO合金吸水率为1.67%,与纯PA56相比降低了57.6%。随着体系中PPO含量的增加,合金材料的结晶温度和结晶度逐渐降低,热失重并未发生明显改变。

PA56/PPO alloys were prepared by toughening and modifying PA56 by melt blending using organic rigid particle PPO as the toughening agent.The results showed that the size of the PPO island phase was 100~300 nm,which was uniformly distributed in the PA56 continuous phase in the form of spherical particles,and with the increase of PPO content in the system,the crystallization temperature and crystallinity of the alloy material gradually decreased,and the thermal weight loss did not change significantly.The notched impact strength and elongation at break of PA56/PPO alloy gradually increased,and the water absorption rate gradually decreased.When the mass fraction of PPO was 30%,the impact strength of PA56/PPO alloy was 9.4 kJ/m^(2),and the elongation at break was 20.5%,which was 303%and 820%higher than pure PA56,respectively.However,the tensile strength of the alloy varies less.The elongation at break was 20.5%,which was 820%higher than that of pure PA56.The water absorption rate was 1.67%,which was 57.6%lower than pure PA56.