| Titre : |
Thermoplastic polyurethanes containing hydrophobic polyphenylene ether polyols |
| Type de document : |
texte imprimé |
| Auteurs : |
Edward N. Peters, Auteur |
| Année de publication : |
2018 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Ether de polyphénylène
Formulation (Génie chimique)
Hydrophobie
Polyols
Polyuréthanes
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Polyurethanes have extensive structure/property diversity. They can be synthesized with a number of materials to modify and tailor their performance. There is interest in broadening the performance profile of Thermoplastic Polyurethanes (TPUs) with increased thermal stability and greater hydrophobicity. PPE telechelic macromonomers (PPE-M) are unique hydrophobic polyols which have an impressive track record in broadly enhancing the performance of epoxy resins, cyanate esters, and thermoplastics. Seeking to meet this demand for enhanced TPU performance, PPE-M were used to synthesize amphiphilic polyurethane block copolymers. In this paper, the performance properties of TPUs produced using these novel hydrophobic polyols are presented and their properties compared against reference TPUs. It was found that TPUs derived from these novel polyols maintain exceptional physical and mechanical performance while also exhibiting improved resistance to moisture and thermo-oxidative degradation. In addition, abrasion, tear, electric insulating properties, and chemical resistance were improved. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Polyol blend preparation - Kinetic data - Formulations - Polymerization
- RESULTS AND DISCUSSION : EO-PO - TPUs PTMG TPUs
- Fig. 1 : PPE chemical structure
- Fig. 2 : PPE-M chemical structure
- Fig. 3 : Homogeneous PPE-M blends with PTMG and EO-PO
- Fig. 4 : Reaction rates of PPE-M with 4,4’-MDI
- Fig. 5 : Moisture uptake at 100% RH
- Fig. 6 : Water absorption after immersion
- Fig. 7 : Contact angles of PPE-M/EO-PO TPUs
- Fig. 8 : Wear resistance
- Fig. 9 : Tear resistance
- Fig. 10 : Elongation at 50 to 75 °C
- Fig. 11 : Effect of PPE-M on heat aging at 100 °C
- Fig. 12 : Dielectric constant
- Fig. 13 : Loss tangent
- Fig. 14 : Carbonaceous residue (char)
- Fig. 15 : Moisture uptake at 100% RH after seven days @ 50 °C
- Fig. 16 : VICAT softening temperatures
- Fig. 17 : Elongation at RT and 50 °C
- Fig. 18 : ensile strength at RT and 50 °C
- Fig. 19 : Effect of PPE-M on heat aging at 100 °C
- Table 1 : Formulation of EO-PO-based TPUs
- Table 2 : Formulation of PTMG-based TPUs
- Table 3 : Weight increase (%) after three days of chemical immersion |
| En ligne : |
https://www.coatingsworld.com/issues/2018-03-01/view_features/thermoplastic-poly [...] |
| Format de la ressource électronique : |
Html |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32528 |
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Thermoplastic polyurethanes containing hydrophobic polyphenylene ether polyols in COATINGS WORLD, Vol. 23, N° 3 (03/2018)
