摘要
采用聚酰胺弹性体MH2030对生物基聚酰胺56/聚酰胺66(PA56/PA66)混合物进行增韧改性,并采用超临界CO_(2)间歇发泡技术制备了一系列不同的生物基PA56泡沫。研究了MH2030含量对PA56/PA66结晶性能、流变性能、力学性能及发泡性能的影响。结果表明,MH2030的加入提高了PA56/PA66材料的黏弹性和发泡性能,使结晶峰向高温方向移动,可能作为了体系的成核剂促进了结晶。MH2030使PA56/PA66材料的韧性增加、刚性降低,在添加20%(质量分数,下同)时材料的抗冲击强度最高,比未增韧时提高了30.4%。对MH2030增韧的PA56/PA66样品进行发泡及泡沫压缩测试,在MH2030含量为10%时,基于其较高的泡孔密度和较好的基体力学性能,得到了具有较小泡孔尺寸(19.24μm)和较高压缩强度(0.71 MPa)的微孔泡沫,比未增韧PA56泡沫的压缩强度高29.1%。
Biobased polyamide 56(PA56)/polyamide 66(PA66)blends were toughened by using polyamide elastomer(MH2030),and then a series of bio⁃based polyamide blend foams were prepared through a supercritical CO_(2) intermittent foaming technology.The effect of MH2030 content on the crystallization,rheological,mechanical properties,and foam⁃ing behaviors of the PA56/PA66/MH2030 blends was investigated.The results indicated that the introduction of MH2030 improved the viscoelasticity and foaming performance of the blends,leading to a shift of the crystallization peak toward a high temperature.This may be due to the nucleating effect of MH2030 on the crystallization of the blending sys⁃tem.The addition of MH2030 also increased the toughness of the blends but reduced their rigidity.The blend containing 20 wt%MH2030 exhibits the highest impact strength,which is 30.4%higher than that without MH2030.The foaming behavior and compression performance of the blend foams were investigated.The blend form containing 10 wt%MH2030 exhibits a higher cell density and better matrix mechanical properties.In this case,the blend foam obtained mi⁃cro⁃size pores with a smaller cell size of 19.24μm and higher compressive strength of 0.71 MPa,which was 29.1%higher than that of the non⁃toughened PA56/PA66 blend foam.
作者
张之琪
王向东
刘海明
陈士宏
ZHANG Zhiqi;WANG Xiangdong;LIU Haiming;CHEN Shihong(School of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2024年第5期55-60,共6页
China Plastics
