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Replication and surface properties of micro injection molded PLA/MWCNT nanocomposites

Title
Replication and surface properties of micro injection molded PLA/MWCNT nanocomposites
Author
김성훈
Keywords
Polylactide; Micro injection molding; Carbon nanotube; Replication property
Issue Date
2020-03
Publisher
ELSEVIER SCI LTD
Citation
POLYMER TESTING, v. 83, article no. 106321
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 a' to a 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.
URI
https://www.sciencedirect.com/science/article/pii/S0142941819315259?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/164965
ISSN
0142-9418; 1873-2348
DOI
10.1016/j.polymertesting.2019.106321
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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