Abstract
-crystalline chitin was added to polylactic acid (PLA), and this PLA was then heat-treated at for one minute. The crystallinity of the heat-treated PLA increased to more than 40%, and its crystallization speed also increased significantly. The temperature dependency of these materials’ relative permittivity () and relative dielectric loss factor () was also examined. The dielectric absorption peak value in curve of the PLA to which chitin was added and was smaller than that of PLA without chitin. Additionally, the Havriliak-Negami relaxation function was used to produce approximation curves for the frequency dependency of and of chitin with PLA added at . As a result, the relaxation strength of the chitin with PLA added was smaller than that of the PLA without chitin, and the relaxation time of the chitin with PLA added was approximately 2.5 times larger than that of the PLA without chitin.
Highlights
Polylactic acid (PLA) is a type of bioplastic
The authors made a study of the electrical characteristics of PLA to investigate the potential of using PLA as an alternative to petroleum-derived plastics and demonstrated through this study that the electrical resistance and electrical insulation breakdown strength of PLA are equivalent to those of low-density polyethylene, a petroleum-derived plastic, at temperatures ranging from room temperature to around 70◦C and that, PLA is a good electrical insulation material [1, 2]
PLA-0 that has been heat-treated for 15 minutes is here called PLA-0 (A). xc of PLA-C was around 12% when the heat treatment time was zero
Summary
Polylactic acid (PLA) is a type of bioplastic It is a material made from the corn starch. At temperatures higher than 70◦C, the insulation performance of PLA deteriorates due to its poor heat resistance, which is a drawback that remains to be resolved [1, 2]. The authors selected biomass resources, made β-crystalline chitin using the cartilaginous components of a squid, a main local product of Hachinohe, combined this β-crystalline chitin and PLA into a composite material, and demonstrated the possibility that this composite material—prepared by adding chitin to PLA— may be capable of reducing the effect of temperature and thereby preventing the electrical characteristics of PLA from deteriorating at temperatures higher than 70◦C [8]. After chitin was added to PLA, the PLA to which the chitin had been added was heat-treated, and thermal analysis was conducted to check the dielectric properties
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