Balla, Vamsi Krishna and Kate, Kunal H and Dattatreya Tadimeti, Jogi Ganesh and Satyavolu, Jagannadh (2020) Influence of Soybean Hull Fiber Concentration on the Water Absorption and Mechanical Properties of 3D-Printed Thermoplastic Copolyester/Soybean Hull Fiber Composites. Journal of Materials Engineering and Performance, 29 (9, SI). pp. 5582-5593. ISSN 1059-9495

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In this work, fused filament fabrication 3D-printed parts of soybean hull fiber thermoplastic copolyester (TPC) composites with soybean hull fiber concentrations of 0-35 wt.% were tested to understand the influence of mechanical properties and moisture sensitivity on the soybean hull fiber concentration. The composites were analyzed for their microstructures and mechanical properties in as-printed condition and after immersion in deionized water for 168 h. The printed parts with >= 25 wt.% soybean hull fiber were found to have more porosity (9-12%) leading to high rate of water absorption with a maximum weight gain of similar to 8% and up to 4% volumetric swelling. However, in the as-printed condition, these composites exhibited significantly higher elastic modulus of 80 +/- 3 MPa than pure TPC (36 +/- 3 MPa) and their strength improved by 40%. The toughness of the composites decreased below that of pure TPC when the fiber concentration was 35 wt.% due to significant drop in the elongation. The composites with <= 15 wt.% soybean hull fiber showed marginal drop in the mechanical properties due to water absorption. Additionally, the microstructural analysis showed good fiber-matrix interfacial characteristics in as-printed condition, which were damaged due to moisture absorption in addition to defragmentation of fiber bundles. Interestingly, the toughness of TPC-soybean hull fiber composites was immune to water absorption and the deleterious effect of moisture on the mechanical appears to be partly reversible after drying the composites.

Item Type: Article
Subjects: Engineering Materials
Divisions: Bioceramics &amp; Coating
Depositing User: Bidhan Chaudhuri
Date Deposited: 02 Feb 2021 11:47
Last Modified: 02 Feb 2021 11:47

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