The rheological and thermomechanical properties ofsome epoxy blends modified with hyperbranched polymersare reported. The effects of different percentagesof a multifunctional reactive diluent were investigatedto develop formulations that could be processed byRTM (Resin Transfer Molding) and VARTM (Vacuum-Assisted Resin Transfer Molding). The diluent chosenfor the study was trimethylolpropane triglycidyl ether,which was added at three percentages: 10%, 20%, and40%. The hyperbranched modifier used was aliphaticpolyester of the fourth pseudo-generation commercializedby Perstorp as BoltornTM H40. A cure cycle composedof a precure at 1358C followed by a postcure at1808C was adopted. The blends were thoroughly characterizedin both the unreacted and cured states. Theunreacted blends were characterized by parallel platerheometry, both in dynamic and isothermal mode.Analysis of the cured samples was carried out throughdynamic mechanical tests after precuring and postcuring.The diluent had an impact, due to its peculiarstructure, 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|