收稿日期: 2018-04-16
网络出版日期: 2020-04-29
基金资助
国家高技术研究发展计划(863计划)资助项目(2015AA033905)
Effects of HSP content on microstructure and mechanical properties of EVA foamed materials
Received date: 2018-04-16
Online published: 2020-04-29
采用注射成型工艺制备了一系列不同配比的乙烯-乙酸乙酯共聚物 (ethylene-vinyl acetate, EVA) 汉麻秆芯粉 (hemp stem powder,HSP) 发泡材料. 通过扫描电子显微镜 (scanning electron microscopy,SEM) 观察了 HSP 的结构形貌和 EVA/HSP 发泡材料的泡孔形貌;通过哈克转矩流变仪和旋转流变仪测试了 EVA/HSP 共混物的熔体强度和储能模量;探究了 HSP 含量对 EVA/HSP 发泡材料力学性能的影响规律.研究结果表明: HSP 表面含有大量的裂缝和凹槽; 随着 HSP 含量的增加,EVA/HSP 发泡材料的泡孔尺寸由 79.64 um 下降到 69.85 um,EVA/HSP 共混物的熔体强度由 3.7 Nm 提升到 4.5 Nm,EVA/HSP 发泡材料的密度、硬度、拉伸强度和回弹性下降,断裂伸长率和压缩永久变形提高.
关键词： 乙烯-乙酸乙酯共聚物; 汉麻秆芯粉; 泡孔形貌; 力学性能
刘丽, 涂多想 . HSP 含量对 EVA 发泡材料微观结构和力学性能的影响[J]. 上海大学学报(自然科学版), 2020 , 26(2) : 207 -215 . DOI: 10.12066/j.issn.1007-2861.2030
A series of ethylene-vinyl acetate (EVA)/hemp stem powder (HSP) foamed materials with different ratios were prepared by following the injection molding process. The morphology of HSP and EVA/HSP foamed materials were observed by scanning electron microscopy (SEM). The melt strength and storage modulus of EVA/HSP blends were tested by Hacker torque rheometer and rotation rheometer. The effects of HSP content on the mechanical properties of EVA/HSP foamed materials were also explored. The results showed that the surface of HSP contained a large number of cracks and grooves, and that with the increase of HSP content, the cell sizes of EVA/HSP foamed materials decreased from 79.64 um to 69.85 um, and the melt strength of EVA/HSP blends increased from 3.7 Nm to 4.5 Nm, the density, hardness, tensile strength and rebound resilience of EVA/HSP foamed materials decreased, and its elongation at break and compression became improved.
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