浸渍新型聚乳酸生物复合材料的含羞草微纤维的物理力学特性和热学特性

IF 2.4 3区 化学 Q3 POLYMER SCIENCE
Arnab Sengupta, Sarojrani Pattnaik, Mihir Kumar Sutar
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引用次数: 0

摘要

本研究涉及合成压缩成型的生态友好型复合材料,其中包含浸渍了不同比例(5、10 和 15%(按重量计))含羞草(MP)超细纤维的新兴生物聚合物聚乳酸(PLA)。含羞草(MP)是一种不可食用的植物,俗称 "碰碰草",它大量生长在世界各地的热带荒地上,通过氢氧化钠(NaOH)从这种植物的茎中提炼出新型纤维。研究中考虑的生物复合材料的物理属性包括密度、空隙率、含水率、吸水性和厚度膨胀趋势。在蒸馏水中浸泡 30 天后,复合材料样品的最大吸水率和厚度膨胀率分别为 7.28% 和 13.2%;这两个参数随着复合材料中纤维含量的增加而增加。纤维含量为 10%的聚乳酸复合材料具有最佳的拉伸和弯曲性能;拉伸强度和模量分别为 20 兆帕和 6902 兆帕,弯曲强度和模量分别为 28 兆帕和 4758 兆帕。热重(TG)和导数热重(DTG)分析表明,加入 MP 纤维增强了聚乳酸复合材料的热稳定性,纤维含量为 15 wt%时,最大降解温度为 293 ℃。复合材料的生物降解性测试结果表明,复合材料在 90 天后会出现明显的失重,其中纤维含量为 15 wt% 的样品的失重率最高,达到 40.96%,有利于废弃后的处理和自然界的无缝同化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Physio-mechanical and thermal characteristics of Mimosa pudica microfibers impregnated novel PLA biocomposite

Physio-mechanical and thermal characteristics of Mimosa pudica microfibers impregnated novel PLA biocomposite

The present work deals with the synthesis of compression-molded eco-friendly composites containing emerging biopolymer polylactic acid (PLA) impregnated with varying proportions (5, 10, and 15% by weight) of Mimosa pudica (MP) microfibers. Characteristics of the prepared composite variants were analyzed to figure out the influence of the novel fibers, derived by sodium hydroxide (NaOH) retting from the stem of the inedible plant with the common name—touch-me-not, which grows abundantly in tropical wastelands across the world. The physical attributes of the biocomposites accounted for in the study were density, void content, moisture content, and water absorption together with thickness swelling tendency. The maximum water absorption and thickness swelling of the composite samples, soaked in distilled water for 30 days, were recorded as 7.28% and 13.2%, respectively; both parameters increased with an increment in fibers loading in the composites. PLA composites with fiber content of 10% recorded the optimum tensile and flexural properties; tensile strength and modulus were 20 MPa and 6902 MPa and flexural strength and modulus were 28 MPa and 4758 MPa, respectively. The inclusion of MP fibers enhanced thermal stability of the PLA composites, indicated by thermogravimetric (TG) and derivative thermogravimetric (DTG) analyses, with a maximum degradation temperature of 293 °C for 15 wt% fiber loading. Biodegradability test results of the composites displayed appreciable weight loss at the end of 90 days, with the highest of 40.96% for the sample containing 15 wt% fiber, which was favorable for the end-of-life disposal and seamless assimilation by nature.

Graphical abstract

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来源期刊
Iranian Polymer Journal
Iranian Polymer Journal 化学-高分子科学
CiteScore
4.90
自引率
9.70%
发文量
107
审稿时长
2.8 months
期刊介绍: Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.
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