Quantitative nanomechanical investigation on deformation of poly(lactic acid)

Hao Liu, Na Chen, So Fujinami, Dmitri Louzguine-Luzgin, Ken Nakajima, Toshio Nishi

研究成果: Article査読

42 被引用数 (Scopus)

抄録

This work deals with the tensile drawing behavior of poly(lactic acid) (PLA) in the amorphous state at room temperature. Nanomechanical mapping method is applied to obtain the submicrometer morphology together with mechanical properties using atomic force microscopy (AFM). By carefully collecting the data of PLA specimens deformed with different elongation, we managed to monitor the microscopic structural/mechanical evolution simultaneously, and thus, the microscopic deformation mechanism was studied phenomenologically. The PLA matrix shows a highly heterogeneous response to the external stress. The stress is concentrated in some preferential places, thereby leading to high local Young's modulus and giving rise to crazes perpendicular to the tensile direction. However, in the position away from the crazes, the matrix undergoes no stress and shows similar Young's modulus as neat PLA specimens. The inhomogeneous stress distribution results in the catastrophic fracture of the matrix at an early state, which could explain the brittle nature of PLA at room temperature.

本文言語English
ページ(範囲)8770-8779
ページ数10
ジャーナルMacromolecules
45
21
DOI
出版ステータスPublished - 2012 11月 13

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 無機化学
  • 材料化学

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