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Title: Structural relaxation in PLLA: Contribution of different scale motions
Authors: Righetti, Maria C.
Mele, Elisa
Keywords: Mobile amorphous fraction
Rigid amorphous fraction
Structural relaxation
Cooperative motions
Local motions
Issue Date: 2018
Publisher: © Elsevier
Citation: RIGHETTI, M.C. and MELE, E., 2018. Structural relaxation in PLLA: Contribution of different scale motions. Thermochimica Acta, 672, pp.157-161.
Abstract: The 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.
Description: This paper is closed access until 30 December 2019.
Sponsor: This work was partially supported by the grant “Royal Society-CNR International Exchanges Award” (IESR2170079).
Version: Accepted for publication
DOI: 10.1016/j.tca.2018.12.027
URI: https://dspace.lboro.ac.uk/2134/36686
Publisher Link: https://doi.org/10.1016/j.tca.2018.12.027
ISSN: 0040-6031
Appears in Collections:Closed Access (Materials)

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