Effect of annealing and orientation on microstructures and mechanical properties of polylactic acid

Yu, Long, Liu, Hongshen, Xie, Fengwei, Chen, Ling and Li, Xiaoxi (2008) Effect of annealing and orientation on microstructures and mechanical properties of polylactic acid. Polymer Engineering and Science, 48 4: 634-641. doi:10.1002/pen.20970


Author Yu, Long
Liu, Hongshen
Xie, Fengwei
Chen, Ling
Li, Xiaoxi
Title Effect of annealing and orientation on microstructures and mechanical properties of polylactic acid
Journal name Polymer Engineering and Science   Check publisher's open access policy
ISSN 0032-3888
1548-2634
Publication date 2008-04
Sub-type Article (original research)
DOI 10.1002/pen.20970
Volume 48
Issue 4
Start page 634
End page 641
Total pages 8
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Formatted abstract
Two types of polylactic acid (PLA) films (one amorphous and one semi-crystalline) were produced by sheet extrusion. Talc was used as a nucleation agent for the semi-crystalline PLA. The films were annealed above their Tg or were uniaxially orientated in two ways: (1) via a drawing system in front of the extruder and die or (2) via a three-roller stretching system. The slower crystallization rate and lower melting stress of the PLA resulted in amorphous film using the drawing system. Annealing above T g increased crystallinity and polymer chain relaxation, which resulted in increases in both strength and toughness. Stretching above T g also produced simultaneous crystallization and chain relaxation, which resulted in increases in both modulus and toughness. Both modulus and tensile strength in the stretching direction were higher than in the crosswise direction. Talc acted not only as a rigid filler to reinforce the PLA, but also as a nucleation agent for the PLA, especially during annealing.
© 2008 Society of Plastics Engineers.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Thu, 10 Mar 2011, 13:17:03 EST by David Fengwei Xie on behalf of Aust Institute for Bioengineering & Nanotechnology