期刊
ACS APPLIED POLYMER MATERIALS
卷 4, 期 4, 页码 2513-2526出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.1c01816
关键词
chitin; nanowhisker; 3D printing; stereolithography; additive manufacturing; surface functionalization
资金
- Engineering Research and Development for Technology (ERDT) of the Philippine Department of Science and Technology (DOST)
This study demonstrates the fabrication of photocurable resin nanocomposites containing chitin nanowhiskers through 3D printing technology, and shows their improved mechanical and thermal properties. These materials have great potential for various industrial applications.
Additive manufacturing, or simply 3D printing (3DP), where objects are built through layer-wise material deposition, has gained significant academic and industrial attention as a result of the development of advanced and functional materials requiring rapid, customized, and flexible solutions. In the context of green manufacturing, diversifying environmentally and economically sustainable material portfolios is an essential endeavor for the success of 3DP technology that uses widely available, highly valuable, and renewable materials. In this study, we used stereolithography (SLA) for processing methacrylate-based photocurable resins containing crab shell-derived chitin nanowhiskers (CNWs), which are surface-functionalized by reactive acrylate groups. Results from full spectral, thermal, structural, and topological analyses corroborate not only the surface functionalization of CNWs but also indicate the presence of these photocurable CNW (pCNW) fillers in the 3D-printed nanocomposites. Owing to the strong interfacial bond induced by the physical and chemical crosslinking between the pCNW and methacrylate (MA) polymer matrix, the internally formulated nanocomposites displayed enhanced thermomechanical properties (e.g., storage modulus and glass transition temperature) compared to those of commercially available pure SLA resins. For instance, the inclusion of 0.5 wt % pCNW improved the tensile strength and stiffness to up to 78 and 71%, respectively, without compromising the toughness and ductility of the printed material. Accordingly, this result also evidences the compatibility between the filler and resin materials. Consequently, the formation of a crosslinked network in the nanocomposite structure results in a higher thermal stability and activation energy (i.e., up to similar to 79%) for all the hybrid materials than the pristine MA. The high-resolution SLA print features, dimensional accuracy, and enhanced mechanical performance of our microstructure-forming functionalized chitin-based nanocomposites make them promising materials for a wide range of robust and high-performance industrial applications.
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