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The effects of annealing on deformation and fracture behavior of injection molded PLA

The effects of annealing on deformation and fracture behavior of injection molded PLA Strength, Fracture and Complexity 4 (2006) 185–188 IOS Press K. Goto a , S. Nakano a and T. Kuriyama b,∗ a b Yamagata Research Institute of Technology, Shoei 2-2-1 Yamagata-shi, #990-2473, Japan Department of Polymer Science and Engineering, College of Engineering, Yamagata University, Jonan 4-3-16 Yonewzawa-shi, #992-8510, Japan Received 25 October 2005 Keywords: Poly (lactic acid), brittle to ductile transition, crystallinity Thermal history such as annealing or quenching significantly affects the mechanical behavior of thermoplastics. As a typical example in amorphous glassy polymer, it is experimentally confirmed that the annealing just below glass transition temperature, Tg leads to a fall in the impact strength [1,2] and/or the fracture strain and increasing in the tensile strength [3]. This behavior, in molecular terms, is often explained by in the local relaxation motion of the structure [4]. The mechanical behavior of semi-crystalline polymer is also affected by thermal history in somewhat different way because the ductility of semi-crystalline polymer is closely related with the degree of crystallinity and/or the number of links between the crystalline lamellae. Therefore, the fracture behavior is complicate by the heat treatment in case of the slow crystallizing polymers such as poly (ethylene terephthalate) (PET) [5]. Recently, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Strength, Fracture and Complexity iospress

The effects of annealing on deformation and fracture behavior of injection molded PLA

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Publisher
IOS Press
Copyright
Copyright © 2006 by IOS Press, Inc
ISSN
1567-2069
eISSN
1875-9262
Publisher site
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Abstract

Strength, Fracture and Complexity 4 (2006) 185–188 IOS Press K. Goto a , S. Nakano a and T. Kuriyama b,∗ a b Yamagata Research Institute of Technology, Shoei 2-2-1 Yamagata-shi, #990-2473, Japan Department of Polymer Science and Engineering, College of Engineering, Yamagata University, Jonan 4-3-16 Yonewzawa-shi, #992-8510, Japan Received 25 October 2005 Keywords: Poly (lactic acid), brittle to ductile transition, crystallinity Thermal history such as annealing or quenching significantly affects the mechanical behavior of thermoplastics. As a typical example in amorphous glassy polymer, it is experimentally confirmed that the annealing just below glass transition temperature, Tg leads to a fall in the impact strength [1,2] and/or the fracture strain and increasing in the tensile strength [3]. This behavior, in molecular terms, is often explained by in the local relaxation motion of the structure [4]. The mechanical behavior of semi-crystalline polymer is also affected by thermal history in somewhat different way because the ductility of semi-crystalline polymer is closely related with the degree of crystallinity and/or the number of links between the crystalline lamellae. Therefore, the fracture behavior is complicate by the heat treatment in case of the slow crystallizing polymers such as poly (ethylene terephthalate) (PET) [5]. Recently,

Journal

Strength, Fracture and Complexityiospress

Published: Jan 1, 2006

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