• français
    • English
    français
  • Login
Help
View Item 
  •   Home
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)
  • View Item
  • Home
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Segmental Relaxation Dynamics in Amorphous Polylactide Exposed to UV Light

Article dans une revue avec comité de lecture
Author
ccARAUJO, Steven
970 Groupe de physique des matériaux [GPM]
ccSAINLAUD, Chloé
970 Groupe de physique des matériaux [GPM]
ccDELPOUVE, Nicolas
970 Groupe de physique des matériaux [GPM]
ccRICHAUD, Emmanuel
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccDELBREILH, Laurent
970 Groupe de physique des matériaux [GPM]
ccDARGENT, Eric
970 Groupe de physique des matériaux [GPM]

URI
http://hdl.handle.net/10985/23585
DOI
10.1002/macp.202200085
Date
2022-07
Journal
Macromolecular Chemistry and Physics,

Abstract

The degradation of polylactide (PLA) under UV exposure is investigated in terms of cooperativity and kinetic fragility at the glass transition. In the first part, possibly coexisting degradation mechanisms are evoked from the interpretation of the infrared spectroscopy analyses. Furthermore, the reduction of PLA chain length, owing to photolytic scissions predominant over local crosslinks, is assessed from chromatography, and confirmed by the shift of the glass transition temperature toward lower temperature. Modulated temperature thermogravimetric analysis (MT-TGA) also shows that the activation energy needed to initiate thermal degradation falls after UV exposure. In the second part, the impact of UV-induced degradation on the cooperative rearranging region (CRR) size and the kinetic fragility, respectively, calculated thanks to calorimetric and dielectric measurements, is discussed. Despite the assumed concomitance of several degradation mechanisms, it is observed that the glass transition, the kinetic fragility, and the CRR size decrease together with the exposure time. Moreover, it is found that the data align well on another trend depicting the change in the relaxation properties caused by plasticization of PLA. Thus, the variations of segmental relaxation properties caused by UV may be related to the increase of free volume linked to the damaging of the PLA structure.

Files in this item

Name:
PIMM_MCP_2022_RICHAUD.pdf
Size:
1.950Mb
Format:
PDF
Description:
Segmental Relaxation Dynamics ...
Embargoed until:
2023-01-07
View/Open

Collections

  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

Related items

Showing items related by title, author, creator and subject.

  • Amorphous rigidification and cooperativity drop in semi−crystalline plasticized polylactide 
    Article dans une revue avec comité de lecture
    VAROL, N.; DELPOUVE, Nicolas; ARAUJO, Steven; DOMENEK, Sandra; GUINAULT, Alain; GOLOVCHAK, Roman; INGRAM, A.; DELBREILH, Laurent; DARGENT, Eric (Elsevier, 2020)
    Plasticization of amorphous polylactide shifts the glass transition and extends its temperature range of crystallization to lower temperatures. In this work, we focus on how low−temperature crystallization impacts the ...
  • Reducing the Gap between the Activation Energy Measured in the Liquid and the Glassy States by Adding a Plasticizer to Polylactide 
    Article dans une revue avec comité de lecture
    ARAUJO, Steven; DELPOUVE, Nicolas; DHÔTEL, Alexandre; DOMENEK, Sandra; GUINAULT, Alain; DELBREILH, Laurent; DARGENT, Eric (ACS Publications, 2018)
    The kinetic fragility of a glass-forming liquid is an important parameter to describe its molecular mobility. In most polymers, the kinetic fragility index obtained from the glassy state by thermally stimulated depolarization ...
  • Cooperativity Scaling and Free Volume in Plasticized Polylactide 
    Article dans une revue avec comité de lecture
    ARAUJO, Steven; DELPOUVE, Nicolas; DOMENEK, Sandra; GUINAULT, Alain; GOLOVCHAK, Roman; SZATANIK, Roman; INGRAM, Adam; FAUCHARD, Cyrille; DELBREILH, Laurent; DARGENT, Eric (American Chemical Society, 2019)
    The experimental evidence of the increase of activation energy associated with the super Arrhenius behavior governing amorphous polylactide by free volume variations has been obtained through a combination of calorimetric, ...
  • Thumbnail
    Glass and sub-glass relaxation changes induced by thermal ageing of epoxy-amine polymer networks – A DMA study 
    Article dans une revue avec comité de lecture
    ccDELANNOY, Romain; QUELENNEC, Blandine; ccTOGNETTI, Vincent; ccDELBREILH, Laurent; ccDELPOUVE, Nicolas; ccRICHAUD, Emmanuel (2023)
    Four epoxy-amine networks were characterized by Dynamical Mechanical Analysis (DMA) and by Dielectric Relaxation Spectroscopy (DRS). The epoxy-amine networks were cured with DGEBA and four aliphatic amine hardeners: three ...
  • Post‐curing and structural relaxation of epoxy networks during early stages of aging for civil engineering applications 
    Article dans une revue avec comité de lecture
    OUMNAS, Sanaa; QUELENNEC, Blandine; ccRICHAUD, Emmanuel; DUTHOIT, Alexis; ccDELPOUVE, Nicolas; ccDELBREILH, Laurent (Wiley, 2023-02)
    In this work, epoxy networks used for civil engineering constructions are aged at ambient temperature, and the impact of the early stages of aging on mechanical properties is analyzed. It is observed that Young's modulus ...

Browse

All SAMCommunities & CollectionsAuthorsIssue DateCenter / InstitutionThis CollectionAuthorsIssue DateCenter / Institution

Newsletter

Latest newsletterPrevious newsletters

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales