New epoxy thermosets obtained from diglycidylether of bisphenol a and modified hyperbranched polyesters with long aliphatic chains cured by diisocyanates
Visualitza/Obre
23225_ftp.pdf (1,134Mb) (Accés restringit)
Sol·licita una còpia a l'autor
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
Cita com:
hdl:2117/19728
Tipus de documentArticle
Data publicació2012
Condicions d'accésAccés restringit per política de l'editorial
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Hyperbranched polyesters modified with long aliphatic
chains with vinyl or epoxy groups as chain ends were
synthesized and added as modifiers to diglycidyl ether
of bisphenol A/toluene-2,4-diisocyanate mixtures in the
presence of benzyldimethylamine as catalyst. The influence
of the addition of these modifiers on the curing
was investigated by thermal analysis and infrared
spectroscopy. The materials obtained were investigated
by electron microscopy and some mechanical
characteristics were determined by nanoindentation
tests. Epoxy terminated hyperbranched led to homogeneous
materials with high crosslinking densities,
whereas vinyl terminated hyperbranched produced
phase separated morphologies. The materials showing
phase separation presented a tough fracture, whereas
the homogeneous materials obtained with epoxidated
hyperbranched showed increased brittleness on
increasing the proportion of modifier. On increasing
the proportion of vinyl terminated hyperbranched in the
thermosets, Young’s modulus and hardness decreased
but the addition of epoxy terminated hyperbranched
did not influence these parameters. The addition of
vinylic hyperbranched to the formulations produced a
decrease in the curing shrinkage, whereas the epoxidic
hyperbranched did not.
CitacióFlores, M. [et al.]. New epoxy thermosets obtained from diglycidylether of bisphenol a and modified hyperbranched polyesters with long aliphatic chains cured by diisocyanates. "Polymer engineering and science", 2012, vol. 52, núm. 12, p. 2597-2610.
ISSN0032-3888
Col·leccions
- TERFIQ - Grup de Termodinàmica i Fisico-Química - Articles de revista [61]
- Departament de Ciència dels Materials i Enginyeria Metal·lúrgica - Articles de revista [960]
- CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials - Articles de revista [283]
- Departament de Màquines i Motors Tèrmics - Articles de revista [473]
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
23225_ftp.pdf | 1,134Mb | Accés restringit |