通过熔融共混、模压发泡将汉麻杆芯粉(HP)与高密度聚乙烯(HDPE)复合,制备了HP/HDPE发泡复合材料,通过扫描电子显微镜、X射线衍射仪、热重分析仪、差示扫描量热仪、万能力学试验机、简支梁冲击试验机、旋转流变仪等对发泡复合材料的微观形貌、结晶性能、热性能、力学性能及流变性能进行了表征和测试。结果表明:发泡复合材料的复数黏度和弹性模量随HP含量的增加先降低后升高,弯曲强度和压缩强度随HP含量增加先上升后下降,HP质量分数为20%时弯曲强度和压缩强度分别提升了21.3%和73.1%;HP质量分数为20%的发泡复合材料其泡孔密度比纯HDPE泡孔密度提升了36.8%;HP对HDPE的结晶影响较小,随着HP含量的增加HDPE结晶度逐渐提高。
Foamed HP/HDPE composites were prepared by melt blending and compression molding foaming using hemp hurd powder (HP) and high-density polyethylene (HDPE).The microstructure,crystalline properties,thermal properties,mechanical properties and rheological behavior of the foamed composites were characterized and tested through scanning electron microscopy (SEM),X-ray diffraction (XRD),thermogravimetric analysis (TGA),differential scanning calorimetry (DSC),universal mechanical testing machine,Charpy impact tester,and rotational rheometer.The results indicated that the complex viscosity and elastic modulus of the foamed composites initially decreased then increased with the increase of HP content.Both flexural strength and compressive strength first increased then decreased with increasing HP content,showing maximum improvements of 21.3% in flexural strength and 73.1% in compressive strength when the HP mass fraction was 20%.The cell density of the foamed composite with 20% HP content was 36.8% higher than that of pure HDPE foam.HP showed limited influence on HDPE crystallization behavior,while the crystallinity of HDPE gradually increased with HP content.
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基金资助
国家自然科学基金(32171696)
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