The rheological and thermomechanical properties of some epoxy blends modified with hyperbranched polymers are reported. The effects of different percentages of a multifunctional reactive diluent were investigated to develop formulations that could be processed by RTM (Resin Transfer Molding) and VARTM (Vacuum- Assisted Resin Transfer Molding). The diluent chosen for the study was trimethylolpropane triglycidyl ether, which was added at three percentages: 10%, 20%, and 40%. The hyperbranched modifier used was aliphatic polyester of the fourth pseudo-generation commercialized by Perstorp as BoltornTM H40. A cure cycle composed of a precure at 1358C followed by a postcure at 1808C was adopted. The blends were thoroughly characterized in both the unreacted and cured states. The unreacted blends were characterized by parallel plate rheometry, both in dynamic and isothermal mode. Analysis of the cured samples was carried out through dynamic mechanical tests after precuring and postcuring. The diluent had an impact, due to its peculiar structure, on both the uncured and cured properties.
|Titolo:||Development of epoxy/hyperbranched blends for resin transfer molding and vacuum assisted resin transfer molding applications: Effect of a reactive diluent|
|Data di pubblicazione:||2009|
|Appare nelle tipologie:||1.1 Articolo in rivista|