Synthesis and characterization of additively manufactured microcapsule‐reinforced polylactic acid composites for autonomous self‐healing

IF 3.2 4区工程技术 Q2 ENGINEERING, CHEMICAL

Polymer Engineering and Science Pub Date : 2024-08-05 DOI:10.1002/pen.26903

Deepak Mudakavi, Karunya G, Patel Varsha, Somashekara M Adinarayanappa

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引用次数: 0

Abstract

Material extrusion‐based additive manufacturing (AM) process builds the objects/structures through a precise feedstock deposition in a layer‐by‐layer manner. Polylactic acid (PLA) is a popular biodegradable feedstock in AM, while octyl methoxycinnamate (OMC) is known for its eco‐friendliness and ultraviolet (UV) protection properties. The present study focuses on the novel infusion methodology of OMC‐based microcapsules into PLA to develop self‐healing composite filaments. Post‐composition iterations, the optimum compositions for the filler and plasticizer were determined, and the filaments were extruded. Microcapsule‐infused PLA and the neat PLA samples were printed as per the American Society for Testing and Materials (ASTM) standard. The uniaxial tensile test results showed that the failure strain endured by the microcapsule‐infused samples was about 10 times more than the neat PLA counterparts. It is attributed to the effective load distribution and the complex polymerization reaction (due to the interaction of OMC with the matrix). Fracture surface morphology of the samples via optical microscopy (OM) and field emission scanning electron microscope (FESEM) affirmed the strong PLA‐OMC interface. A depreciation in the Brinell Hardness for the microcapsule‐based samples was due to the localized indenter force, causing greater damage in a narrow area than microcapsule ruptures' healing ability.Highlights

The optimized composition of PLA: plasticizer:microcapsule is 1:0.04:0.05.

Microcapsule‐infused PLA has improved Young's modulus and failure strain.

Interaction with microcapsules improves elastic behavior and self‐healing.

FESEM reveals close bonding of microcapsule with the PLA matrix.

查看原文本刊更多论文

用于自主自愈的添加式制造微胶囊增强聚乳酸复合材料的合成与表征

基于材料挤压的增材制造（AM）工艺通过逐层精确沉积原料来制造物体/结构。聚乳酸（PLA）是增材制造中常用的可生物降解原料，而甲氧基肉桂酸辛酯（OMC）则以其生态友好性和紫外线（UV）防护特性而闻名。本研究的重点是在聚乳酸中注入基于 OMC 的微胶囊的新方法，以开发自愈合复合长丝。经过迭代，确定了填充剂和增塑剂的最佳成分，并挤出了长丝。根据美国材料与试验协会（ASTM）的标准，对注入微胶囊的聚乳酸和纯聚乳酸样品进行了印刷。单轴拉伸试验结果表明，注入微胶囊的样品承受的破坏应变是未注入微胶囊的聚乳酸样品的 10 倍。这归因于有效的载荷分布和复杂的聚合反应（由于 OMC 与基质的相互作用）。通过光学显微镜（OM）和场发射扫描电子显微镜（FESEM）观察样品的断裂表面形态，证实了聚乳酸与 OMC 之间存在牢固的界面。基于微胶囊的样品的布氏硬度下降是由于局部压头力造成的，在狭窄区域造成的破坏比微胶囊破裂的愈合能力更大。注入微胶囊的聚乳酸提高了杨氏模量和破坏应变。与微胶囊的相互作用改善了弹性行为和自愈合能力。FESEM 显示微胶囊与聚乳酸基质紧密结合。

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来源期刊

Polymer Engineering and Science 工程技术-高分子科学

CiteScore

5.40

自引率

18.80%

发文量

329

审稿时长

3.7 months

期刊介绍： For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology. The importance of PE&S is underscored by the frequent rate at which its articles are cited, especially by other publications - literally thousand of times a year. Engineers, researchers, technicians, and academicians worldwide are looking to PE&S for the valuable information they need. There are special issues compiled by distinguished guest editors. These contain proceedings of symposia on such diverse topics as polyblends, mechanics of plastics and polymer welding.