Development of Highly Functional Polylactic Acid Composites to Be Used in Electronic Instruments

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  • 電子機器用の高機能なポリ乳酸組成物の開発
  • デンシ キキヨウ ノ コウキノウ ナ ポリ ニュウサン ソセイブツ ノ カイハツ

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To use a bioplastic of polylactic acid (PLA) in the main parts of electronic instruments, we have developed advanced PLA composites. These show high practicability, including good heat resistance, strength and flame retardancy while fully preserving high biomass-based component ratio and chemical safety. They also exhibit good shape memory and thermal diffusivity as desirable new properties in upcoming instruments. Adding a natural kenaf fiber increased heat resistance and elastic modulus of PLA, and using a PLA-polyester copolymer improved the impact strength of the PLA composite. A high flame retardancy and other important characteristics including moldability and strength were successfully achieved by adding heat-absorbing aluminum hydroxide and phenol novolac-type charring agent in PLA. Combinations of shape memory and recyclability (thermoplasticity) were performed by cross-linking PLA using a thermo- reversible bond for the use in wearable devices, which are deformable and recyclable. Furthermore, we achieved a high thermal diffusivity comparable to that of stainless steel by including carbon fibers (6 mm long) cross-linked by a natural amide compound as a dispersing and binding agent in PLA to improve heat release issues caused by small and thin devices.<br>

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 68 (6), 370-381, 2011

    The Society of Polymer Science, Japan

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