Effect of cooling conditions on the mechanical properties of crystalline poly(lactic acid)

ABSTRACT Appropriate cooling conditions in melt processing were found to provide crystalline poly(lactic acid) (PLA) with greater mechanical toughness in tensile tests. PLA films cooled near its glass transition temperature Tg showed ductile behavior, whereas those obtained by a quenching process ex...

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Bibliographic Details
Published inJournal of applied polymer science Vol. 134; no. 24; pp. np - n/a
Main Authors Huang, Tong, Yamaguchi, Masayuki
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Subscription Services, Inc 20.06.2017
Subjects
Cooling effects
Crystal structure
Crystallinity
Degree of crystallinity
Ductile-brittle transition
Fracture toughness
Materials science
mechanical properties
poly(lactic acid)
Polymers
processing
Quenching
Quenching (cooling)
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Summary:ABSTRACT Appropriate cooling conditions in melt processing were found to provide crystalline poly(lactic acid) (PLA) with greater mechanical toughness in tensile tests. PLA films cooled near its glass transition temperature Tg showed ductile behavior, whereas those obtained by a quenching process exhibited brittle fracture. The content of gauche‐gauche (gg) conformer, which leads to low critical onset stress for shear yielding, increased in the films cooled near Tg. The crystallinity of the films hardly affected their mechanical toughness and proportion of gg conformer except for that with a high degree of crystallinity (>50%). © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44960.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0021-8995
1097-4628
DOI:10.1002/app.44960