Structure variation of tensile-deformed amorphous poly(l-lactic acid): Effects of deformation rate and strain

The present work explored the structure-property correlations for the biopolymer poly(l-lactic acid) (PLA) by studying deformation-mediated molecular orientation and crystallization. The structural and morphological variations of amorphous PLA under different strain rates were investigated. The resu...

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Bibliographic Details
Published in:Polymer (Guilford) 2011-08, Vol.52 (18), p.4141-4149
Main Authors: Zhang, Xiuqin, Schneider, Konrad, Liu, Guoming, Chen, Jianhong, Brüning, Karsten, Wang, Dujin, Stamm, Manfred
Format: Article
Language:English
Subjects:
Amorphous structure
Applied sciences
biopolymers
crystal structure
Crystallinity
Crystallization
Deformation
Exact sciences and technology
Mechanical properties
Organic polymers
Orientation
Orientation and crystallization
Physicochemistry of polymers
Poly(l-lactide) (PLA)
Polylactic acid
Properties and characterization
Strain
Strain hardening
Strain rate
Stretching
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Summary:The present work explored the structure-property correlations for the biopolymer poly(l-lactic acid) (PLA) by studying deformation-mediated molecular orientation and crystallization. The structural and morphological variations of amorphous PLA under different strain rates were investigated. The result showed that strain rate significantly influences its strain-hardening behavior. The crystallinity and orientation as well as cavitation of deformed PLA increase with the increase of strain rates. The structure evolution has been divided into three potential stages: (i) at small strains (160%), the increasing number of oriented chains in the amorphous regions promotes the crystallization of PLA. Our study suggests that strain rate and stretching strain play important roles on modulating the crystallization and orientation of amorphous PLA. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2011.07.003