Replication and surface properties of micro injection molded PLA/MWCNT nanocomposites |
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| Affiliation: | 1. Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi’an University of Technology, Xi’an, 710048, China;2. School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing, 100048, China;3. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China;4. School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an, 710048, China;1. Departamento de Ciencia y Tecnología de Polímeros and POLYMAT, Facultad de Ciencias Químicas UPV/EHU, P.O. Box 1072, San Sebastián 20080, Spain;2. Université de Pau et des Pays de l’Adour/CNRS IPREM UMR5254, Equipe de Physique et Chimie des Polymères, 2, Avenue du Président Angot, 64053 Pau, France |
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| Abstract: | Multi-walled carbon nanotube (MWCNT) reinforced polylactide (PLA) nanocomposites were injected molded into a mold with micro needle patterns. In order to alleviate the hesitation effect caused by an increased melt viscositgy of PLA/CNT nanocomposites, the effects of the injection speed and holding pressure on the replication property were investigated. The effects of MWCNTs on the crystallization, thermal behavior, replication properties, replication and surface properties of micro injection molded PLA/CNT nanocomposites were investigated. An analysis of crystallinity and thermal behavior indicated that the MWCNTs promoted the unique α’ to α crystal transition of PLA, leading to an enhancement of surface modulus and hardness, as measured using a nanoindentation technique. The specific interaction between PLA and MWCNTs was characterized using an equilibrium melting point depression technique. Furthermore, the MWCNTs increased the activation energy for thermal degradation of PLA due to the physical barrier effect. The improved replication quality of the microfeatures in the PLA/MWCNT nanocomposites has been achieved by elevating injection speed and holding pressure, which enhances the polymer filling ability within the micro cavity. A replication ratio greater than 96% for the micro injection molded PLA/CNT nanocomposites were achieved at holding pressure of 100 MPa and injection speed of 120 mm/s. This study shows that processing conditions significantly influence the replication and surface properties of micro injection molded PLA/CNT nanocomposites. |
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| Keywords: | Polylactide Micro injection molding Carbon nanotube Replication property |
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