| Titre : |
The effect of molecular parameters on the thermal behavior of recycled and virgin polyamides and their glass fiber composites |
| Type de document : |
texte imprimé |
| Auteurs : |
A. Mirzadeh, Auteur ; H. Ghasemi, Auteur ; Phil J. Bates, Auteur ; Musa R. Kamal, Auteur |
| Année de publication : |
2014 |
| Article en page(s) : |
p. 4-12 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Composites à fibres de verre
Composites à fibres de verre -- Recyclage
Cristallisation
Poids moléculaires
Polyamide 6
Polyamide 66
Polymères -- Recyclage
Produits et matériaux recyclés
Structure moléculaire
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
A study was carried out to evaluate the effects of molecular weight and molecular structure on non-isothermal crystallization behavior of recycled and virgin polyamides (PA) and their corresponding glass fiber (GF) composites. Two different recycled polyamides (PA), namely post-industrial waste (PIW) and post-consumer waste (PCW) were used. The former was obtained from a fiber manufacturer and the latter was recycled from used carpets. The molecular weights of the resins were measured by intrinsic viscosity (IV) measurements and 13carbon nuclear magnetic resonance (13C-NMR). The NMR technique also provided information on PA structure, cis and trans amide conformers content and residual unreacted monomer. Non-isothermal crystallization of the resins was studied using differential scanning calorimetry (DSC). The molecular weights of recycled materials were higher than that of virgin injection molding grade PA-6. However, the crystallization rates (indicated by t1/2) of recycled resins were faster. It could be attributed to the presence of TiO2 in recycled materials. Moreover, the higher cis-amide conformer content of recycled resins suggested higher segmental mobility. On the other hand, the crystallization rate of composites based on recycled PA-6 was slower than that of composites based on the virgin PA-6. The suppression of crystallization rate was apparently due to PA-66 added during the preparation of reinforced recycled resins. This behavior was confirmed by model compounds based on PA-6/PA-66 blends. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Sample preparation and characterization
- RESULTS AND DISCUSSION : Molecular weight measurements - Molecular parameters - Non-isothermal crystallization |
| DOI : |
10.3139/217.2775 |
| En ligne : |
https://drive.google.com/file/d/1KHoV0g1ESFxZQ5ZDVRn6ufTY_hKn1AqA/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20570 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 4-12
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The effect of molecular parameters on the thermal behavior of recycled and virgin polyamides and their glass fiber composites in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)
