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Dielectric Breakdown Properties of Polylactic Acid with Spherulite Growth
Author(s) -
MATSUGASAKI NARU,
SHINYAMA KATSUYOSHI,
FUJITA SHIGETAKA
Publication year - 2015
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11758
Subject(s) - spherulite (polymer physics) , materials science , polylactic acid , crystallinity , composite material , ultimate tensile strength , dielectric , low density polyethylene , polyethylene , atmospheric temperature range , polymer , physics , optoelectronics , meteorology
SUMMARY Polylactic acid (PLA) is a bioplastic and a biomass material that is made from corn starch, and so on. Having studied the potential of PLA as an electrical insulation material, the authors have demonstrated that PLA has high resistivity, high dielectric breakdown strength, and other outstanding electrical insulation properties, equivalent to those of low‐density polyethylene (LDPE) and other petroleum‐based plastics, within a temperature range from room temperature to approximately 70°C. The degree of crystallinity of PLA was increased by heat treatment, and the dielectric breakdown strength (EB) and mechanical properties of the obtained PLA with different spherulite sizes were studied. PLA heat‐treated at a temperature of 120°C or higher showed rapid increases in spherulite size. At both measurement temperatures of 25°C and 80°C, the EB showed rapid falls when the heat treatment temperature was 120°C or higher. At a measurement temperature of 25°C, the tensile strength at break and breaking elongation showed rapid falls when the heat treatment temperature was 120°C or higher.