| Titre : |
Crystallization kinetics and multiple melting behavior of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate) |
| Type de document : |
texte imprimé |
| Auteurs : |
B.-B. Tong, Auteur ; Y.-H. Ding, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 669-676 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Calorimétrie
Cinétique chimique
Cristallisation
Diffractométrie de rayons X
Poly(3-hydroxybutyrate- co -4-hydroxybutyrate)
Polymères -- Fusion
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The crystallization and melting behavior of biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] with 11 % 4HB content was investigated by differential scanning calorimetry (DSC), small and wide angle X-ray scattering (SAXS and WAXS). The Avrami analysis was performed to obtain the kinetic parameters of crystallization. The results showed that the Avrami equation was suitable for describing the isothermal and nonisothermal crystallization processes of P(3HB-co-4HB). Based on the values of the equilibrium melting temperature and the half-time of crystallization, its nucleation constant of crystal growth kinetics was obtained by using the Lauritzen-Hoffman model, which was found to be 1.92 × 105 K2, lower than that for pure PHB. During the subsequent heating process, quite different multiple melting behaviors were observed for P(3HB-co-4HB) crystallized isothermally or nonisothermally. The origins of the multiple melting behaviors were discussed based on either the presence of dual lamellar thicknesses or the melt-recrystallization mechanism. In general, the crystallization and melting behaviors were elucidated by this work. |
| Note de contenu : |
- EXPERIMENTAL SECTION : Materials - Differential scanning calorimetry - X-Ray measurements
- RESULTS AND DISCUSSION : Isothermal crystallization kinetics and melting behavior - Crystal growth analysis - Nonisothermal crystallization and melting behavior of P (3HB-co-4HB) |
| DOI : |
10.3139/217.3599 |
| En ligne : |
https://drive.google.com/file/d/1UT-URNmOjBjTKXpkEvqjONtnlMnDCA8b/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31406 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 5 (11/2018) . - p. 669-676
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