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

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.

Preparation and Characterization of 3D Printed PLA-Based Conductive Composites Using Carbonaceous Fillers by Masterbatch Melting Method

“…A two-layer pattern was printed on different baseplates, such as (a) on the PLA, (b) its composite with wood flour, (c) on the flexible TPU, and (d) its composite with wood flour. All materials used for the baseplates were prepared in our laboratory [9,47]. As can be seen in Figure 14, the patterns and the different baseplates could be satisfactorily combined and bent without separating from the baseplates.…”

3D and 4D printing for optics and metaphotonics

“…SMPs can be easily used in conventional 3D printing methods, such as FDM and PolyJet. Thermoplastic SMPs such as PLA [38,39] and thermoplastic polyurethane [29,40,41] can be used in FDM 3D printing. For example, Yang et al fabricated photoresponsive 3D-printed structures using polyurethane filaments that included carbon black [29] ( Figure 4B).…”

Shape Memory Polyurethane and its Composites for Various Applications

“…Several applications in the biomedical field require complex and personalized dimensions and shapes for smart devices which are difficult to produce using conventional manufacturing techniques. The combination of shape memory and 3D printing can be a solution which has enormous potential for the development of complex smart devices [98,101,102]. 3D printing is a low cost rapid fabrication technique with layer-by-layer additive manufacturing for the production of complex and personalized structures and devices.…”