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Polymers 2018, 10(11), 1234; https://doi.org/10.3390/polym10111234

Mechanical, Thermal, and Shape Memory Properties of Three-Dimensional Printing Biomass Composites

1
Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China
2
Mechanical and Energy Engineering Department, University of North Texas, Denton, TX 76201, USA
3
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
*
Author to whom correspondence should be addressed.
Received: 4 October 2018 / Revised: 27 October 2018 / Accepted: 27 October 2018 / Published: 7 November 2018
(This article belongs to the Special Issue Additive Manufacturing of Polymeric Materials)
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Abstract

In this study, a series of heat-induced shape memory composites was prepared by the hot-melt extrusion and three-dimensional (3D) printing of thermoplastic polyurethane (TPU) using wood flour (WF) with different contents of EPDM-g-MAH. The mechanical properties, microtopography, thermal property analysis, and heat-induced shape memory properties of the composites were examined. The results showed that, when the EPDM-g-MAH content was 4%, the tensile elongation and tensile strength of the composites reached the maximum value. The scanning electron microscopy and dynamic mechanical analysis results revealed a good interface bonding between TPU and WF when the EPDM-g-MAH content was 4%. The thermogravimetric analysis indicated that the thermal stability of TPU/WF composites was enhanced by the addition of 4% EPDM-g-MAH. Heat-induced shape memory test results showed that the shape memory performance of composites with 4% EPDM-g-MAH was better than that of unmodified-composites. The composites’ shape recovery performance at a temperature of 60 °C was higher than that of the composites at ambient temperature. It was also found that, when the filling angle of the specimen was 45°, the recovery angle of the composites was larger. View Full-Text
Keywords: wood flour/thermoplastic polyurethane blend; EPDM-g-MAH; interface bonding; shape memory wood flour/thermoplastic polyurethane blend; EPDM-g-MAH; interface bonding; shape memory
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bi, H.; Xu, M.; Ye, G.; Guo, R.; Cai, L.; Ren, Z. Mechanical, Thermal, and Shape Memory Properties of Three-Dimensional Printing Biomass Composites. Polymers 2018, 10, 1234.

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