为降低可降解聚乳酸(PLA)基木塑复合材料的成本并弥补其韧性差的不足,以PLA为基体,KH550改性的沙柳木粉为填料,偶氮二甲酰胺(AC)和氧化锌(ZnO)分别为发泡剂和发泡助剂,采用模压法制备沙柳/PLA发泡复合材料,研究AC用量对复合材料发泡行为和性能的影响。结果表明,密度为1.0g/cm3,AC用量为0.5%(wt,质量分数)时,复合材料泡孔结构均匀致密,各项性能相对较优,静曲强度、弹性模量、拉伸强度和冲击强度分别为59.77MPa、4109MPa、33.68MPa和3.71kJ/m2,热变形温度为57.7℃;与密度为1.1g/cm3未发泡木塑复合材料相比,静曲强度和拉伸强度保持率较高,分别为98.8%和95.4%,弹性模量、热变形温度、储能模量和损耗模量小幅提升,冲击强度提升37.8%,复合材料的韧性得到明显改善。
To reduce the cost of biodegradable polylactic acid (PLA)-based wood-plastic composites and address their poor toughness,salix wood powder modified with KH550 was used as a filler,PLA as the matrix,and azodicarbonamide (AC) and zinc oxide (ZnO) as the foaming agent and foaming aid,respectively,to prepare salix/PLA foamed composites by compression molding method.The effect of AC content on the foaming behavior and performance of the composites was investigated.The results showed that when the density was 1.0g/cm3 and the AC content was 0.5wt%,the composite exhibited a uniform and dense pore structure,with relatively superior properties.The static bending strength,elastic modulus,tensile strength,and impact strength were 59.77MPa,4109MPa,33.68MPa,and 3.71kJ/m2,respectively,and the heat distortion temperature was 57.7℃.Compared to the non-foamed composite with a density of 1.1g/cm3,the retention rates of static bending strength and tensile strength were relatively high at 98.8% and 95.4%,respectively.Additionally,the elastic modulus,heat distortion temperature,storage modulus,and loss modulus showed slight improvements,while the impact strength increased by 37.8%,significantly improving the toughness of the composite material.
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基金资助
内蒙古农业大学学科交叉研究基金(BR231403);内蒙古自然科学基金面上项目(2022MS03043);国家自然科学基金地区项目(31660177)
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