Improving and predicting the mechanical properties of foamed and stretched composite poly(lactic acid) films

eXPRESS Polymer Letters

S. Hussain¹ 

关键词: mechanical properties;    PLA foam;    X-ray tomography;    reinforcements;    modelling and simulation;   

DOI  :  10.3144/expresspolymlett.2019.3

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

Foamed poly(lactic acid) films reinforced with micro-crystalline cellulose (MCC), were uniaxially stretched todifferent ratios. At 10% (weight) loading MCC particles gave an approximately 3.5 times improvement in stiffness over unreinforcedfoams. X-ray tomography and image analysis showed that most MCC particles had low aspect ratios, were randomlyoriented and well distributed. Stretching did not change the orientation of the MCC particles. Increases in stiffnesswith stretching were due to the alignment of the foam cell walls. Electron microscopy and image analysis showed that thefoam cells were elongated and the walls aligned in the stretch direction. There was a good fit between measured stiffnessand micro-mechanical modelling based on a variation of the Mori-Tanaka model for reinforcing particles randomly orientedin 3 dimensions.

【 授权许可】

CC BY