评估用香根草切碎纤维和珍珠粟衍生纳米二氧化硅增强的聚乳酸聚合物复合材料对环境可持续性的影响

IF 2.6 4区 化学 Q3 POLYMER SCIENCE
A. Ashothaman, J. Sudha, N. Senthilkumar, K. Palanikumar
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引用次数: 0

摘要

为了寻找轻质材料,全球各地都在考虑在工程应用中采用聚合物(可生物降解)复合材料,以满足对环境可持续性的要求。在这项研究中,使用注塑成型技术,以不同重量比例(5、10、15、20 和 25 wt.%)的切碎香根草纤维(VFs)为增强材料,并添加 2 wt.% 的纳米二氧化硅(nSiO2),制成了基于聚乳酸(PLA)的可生物降解聚合物复合材料。根据美国材料与试验协会(ASTM)的指导方针,对所制造的聚乳酸 + VF 复合材料的机械、磨损和热性能进行了表征。显微照片显示,nSiO2 和切碎的 VF 在聚乳酸基体中分布均匀,这可能会影响复合材料的性能。结果表明,随着聚乳酸基体中加入 VFs,密度和孔隙率会成正比增加。同样,拉伸强度、冲击强度和弯曲强度在添加到 20 wt.% 之前都会增加,之后由于纤维与基体的界面粘合力较差,拉伸强度、冲击强度和弯曲强度呈下降趋势。吸水性随 nSiO2 的加入而降低,但随 VF 的加入而增加。聚乳酸 + nSiO2 + VF 的热变形温度升高,而线性热膨胀系数则随着 VF 的加入而降低,直到 20 wt.%。nSiO2 和 VF 具有一定的自润滑特性,因此它们的加入提高了耐磨性。热重分析(TGA)和差示扫描量热分析(DSC)显示,加入 20 wt.% 的 VF 和 nSiO2 可提高耐热能力,因为基体软化发生在 57°C-80.7°C 范围内,加热值为 99.4°C,残余质量为 99.6%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of polylactic acid polymer composites strengthened with chopped vetiver fiber and pearl millet-derived- nano silica towards environmental sustainability

Evaluation of polylactic acid polymer composites strengthened with chopped vetiver fiber and pearl millet-derived- nano silica towards environmental sustainability

In search of lightweight materials, polymer (biodegradable) composites are considered across the globe in engineering applications that suit their requirements towards environmental sustainability. In this study, the biodegradable polylactic acid (PLA) based polymer composite is fabricated by reinforcing chopped vetiver fibers (VFs) of varying proportions of weight (5, 10, 15, 20 and 25 wt.%) along with 2 wt.% addition of nano-silica (nSiO2) derived from pearl millet using injection moulding. The fabricated PLA + VF composite is characterized by its mechanical, wear and thermal behaviour as per ASTM guidelines. Micrographs show an even distribution of nSiO2 and chopped VFs in the PLA matrix which can impact the properties of composite. Results show that, with the inclusion of VFs in the PLA matrix the density and porosity increase proportionally. Similarly tensile, impact and flexural strength increases until 20 wt.% addition, afterwards a decreasing trend is observed due to poor interfacial bonding of fibers with the matrix. Water absorption nature decreases with the inclusion of nSiO2, but increases with the inclusion of VFs. The heat deflection temperature of PLA + nSiO2 + VF increases whereas the coefficient of linear thermal expansion decreases with the inclusion of VFs till 20 wt.%. Wear resistance gets improved due to the incorporation of nSiO2 and VFs which possess certain self-lubricating properties. Thermal gravimetry analysis (TGA) and differential scanning calorimetry (DSC) assessments exposed that, the addition of VF (20 wt.%) and nSiO2 increases the heat-withstanding capability as the matrix softening occurs in the 57°C-80.7°C range, with a heating value of 99.4°C, the residual mass obtained is 99.6%.

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来源期刊
Journal of Polymer Research
Journal of Polymer Research 化学-高分子科学
CiteScore
4.70
自引率
7.10%
发文量
472
审稿时长
3.6 months
期刊介绍: Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology, including: polymer synthesis; polymer reactions; polymerization kinetics; polymer physics; morphology; structure-property relationships; polymer analysis and characterization; physical and mechanical properties; electrical and optical properties; polymer processing and rheology; application of polymers; supramolecular science of polymers; polymer composites.
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