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Strength, Fracture and Complexity 4 (2006) 185â188 IOS Press K. Goto a , S. Nakano a and T. Kuriyama b,â 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 signiï¬cantly affects the mechanical behavior of thermoplastics. As a typical example in amorphous glassy polymer, it is experimentally conï¬rmed 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,
Strength, Fracture and Complexity – IOS Press
Published: Jan 1, 2006
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