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Structural relaxation in PLLA: Contribution of different scale motions
journal contribution
posted on 2019-01-28, 14:46 authored by Maria C. Righetti, Elisa MeleElisa MeleThe enthalpy relaxation in amorphous and semi-crystalline poly(L-lactic acid) (PLLA) has been investigated at low and high undercooling to identify the different scale motions that contribute to physical ageing, and the temperature ranges in which they are active. The temperature limit below which exclusively small-scale localized motions produce structural relaxation in PLLA has been identified. In addition, motions different from pure cooperative large-scale motions and pure small-scale local rearrangements, localized in the mobile amorphous fraction, are found to mainly contribute to structural relaxation at intermediate undercoolings. These motions are suggested to be related with the Johari-Goldstein process.
Funding
This work was partially supported by the grant “Royal Society-CNR International Exchanges Award” (IESR2170079).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Thermochimica ActaVolume
672Pages
157 - 161Citation
RIGHETTI, M.C. and MELE, E., 2018. Structural relaxation in PLLA: Contribution of different scale motions. Thermochimica Acta, 672, pp.157-161.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This paper was accepted for publication in the journal Thermochimica Acta and the definitive published version is available at https://doi.org/10.1016/j.tca.2018.12.027Acceptance date
2018-12-29Publication date
2018-12-30Copyright date
2019ISSN
0040-6031Publisher version
Language
- en