Titre :

Effect of Chemical Composition on Molecular Mobility and Phase Coupling in Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with Different Comonomer Contents

Auteur(s) :

Fosse, Clément [Auteur]
Groupe de physique des matériaux [GPM]
Esposito, Antonella [Auteur]
Laboratoire d’Etude et de Caractérisation des Amorphes et des Polymères [AMME-LECAP EA 4528 International Laboratory]
Groupe de physique des matériaux [GPM]
Lemechko, Pierre [Auteur]
Institut de Recherche Dupuy de Lôme [IRDL]
Salim, Yoga Sugama [Auteur]
Groupe de physique des matériaux [GPM]
Causin, Valerio [Auteur]
Dipartimento di Scienze Chimiche [Padova]
Gaucher, Valerie [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Bruzaud, Stéphane [Auteur]
Institut de Recherche Dupuy de Lôme [IRDL]
Université de Bretagne Sud [UBS]
Sudesh, Kumar [Auteur]
Universiti Sains Malaysia [USM]
Delbreilh, Laurent [Auteur]
Laboratoire d’Etude et de Caractérisation des Amorphes et des Polymères [AMME-LECAP EA 4528 International Laboratory]
Groupe de physique des matériaux [GPM]
Dargent, Eric [Auteur]
Laboratoire d’Etude et de Caractérisation des Amorphes et des Polymères [AMME-LECAP EA 4528 International Laboratory]
Groupe de physique des matériaux [GPM]
Gaucher, Valerie [Auteur]

Titre de la revue :

Journal of Polymers and the Environment

Nom court de la revue :

J Polym Environ

Numéro :

31

Pagination :

4430-4447

Éditeur :

Springer Science and Business Media LLC

Date de publication :

2023-05-12

ISSN :

1566-2543

Mot(s)-clé(s) en anglais :

Polyhydroxyalkanoates
Thermal analysis
Microstructure
Molecular mobility
Phase coupling
Rigid amorphous fraction

Discipline(s) HAL :

Chimie/Matériaux
Chimie/Polymères

Résumé en anglais : [en]

Two series of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) and poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) with different amounts of hydroxyvalerate (HV) and hydroxyhexanoate (HHx) units are compared. ...
Lire la suite >Two series of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) and poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) with different amounts of hydroxyvalerate (HV) and hydroxyhexanoate (HHx) units are compared. The influence of chemical composition on the molecular mobility in quenched samples is discussed, as well as the consequences on the aptitude to crystallize and the microstructures developed during cold-crystallization. In both quenched PHBHV and PHBHHx, decreases as the content of comonomer unit increases. The HHx units (propyl side-groups) are better molecular spacers and produce a stronger shift as compared to the HV units (ethyl side-groups). Copolymerization has no striking effect on the width of the glass transition and the cooperativity length in quenched samples, but in cold-crystallized samples the glass transition is dramatically broadened. When the fully amorphous copolymers are heated from the glassy state to room temperature, crystallization occurs but is largely disrupted, suggesting that the molecular environment in the amorphous phase is significantly changed. The HHx units, which are excluded from the host crystals, delay and slow down the crystallization kinetics in a stronger way as compared to the HV units, which can partially co-crystallize. The obtained crystalline phases are prone to reorganization and the residual amorphous phases appear to have strong differences in composition and large density fluctuations. A practical consequence is that microstructures with different coupling between phases, and thus different properties and stability over time, can be obtained by controlling the nature and content of the comonomer units.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Ingénierie des Systèmes Polymères

Date de dépôt :

2023-12-11T14:52:46Z
2023-12-15T09:21:56Z