2007
DOI: 10.1021/jp074509t
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Roles of Conformational and Configurational Defects on the Physical Aging of Amorphous Poly(lactic acid)

Abstract: The roles of poly(lactic acid) chain conformation and configuration on the enthalpy relaxation kinetics of amorphous poly(lactic acid) were examined. Enthalpic relaxation data, which were scaled to the same supercooling from the initial fictive temperature, were taken for three types of the polymer containing various d-lactyl monomers (5.7%, 13.0%, 50%) to assess the effects of configurational defects. The kinetics data were very similar from sample to sample. The effects of configurational defects were assess… Show more

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Cited by 49 publications
(40 citation statements)
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“…In addressing the variation of vitrification enthalpy with heating rate, Hodge has used the concept of a "characteristic relaxation time" ( ) [32], while Aou et al [33] For cooling experiments carried out from the memory-erased melt state the plots display a decrease in Tg with increasing cooling rate. This is a similar trend to that observed for the heat of crystallization in Fig.…”
Section: Vitrification Kineticsmentioning
confidence: 99%
“…In addressing the variation of vitrification enthalpy with heating rate, Hodge has used the concept of a "characteristic relaxation time" ( ) [32], while Aou et al [33] For cooling experiments carried out from the memory-erased melt state the plots display a decrease in Tg with increasing cooling rate. This is a similar trend to that observed for the heat of crystallization in Fig.…”
Section: Vitrification Kineticsmentioning
confidence: 99%
“…The glass transition temperatures (T g ) of PLA are also varied to be 45~55 o C, depending on the D-isomer content. [7][8][9] Since the T g values of PLA samples are not far from the room temperature, it is expected that the local segmental motion of PLA is still available at the service temperatures and thus the physical aging takes place.…”
Section: Introductionmentioning
confidence: 99%
“…Apart from the mechanical properties, 19-23 a variety of properties of glassy polymers such as barrier resistance 24,25 and crystallization behavior 26,27 have also been reported to be dependent on the physical aging process. 37,38 Although the enthalpy relaxation of PLLA during physical aging has been investigated by several research groups, [39][40][41][42] the mechanism for the chain movement and molecular reorganization with aging has been still unclear. At present, the effects of physical aging on the macroscopic properties and microstructure of many traditional plastics including polycarbonate, PET, and polystyrene ͑PS͒ have been extensively investigated.…”
Section: Introductionmentioning
confidence: 99%