Cellulose Chemistry and Tehnology ..
N2 - Hollow particle (microballoon) filled composites, called syntactic foams, are known as highly damage tolerant lightweight composites. Epoxy and aluminum matrix syntactic foams containing glass microballoons have been widely studied for marine and aerospace applications and have been found suitable for structural and a variety of other applications. The present study is focused on synthesis and characterization of vinyl ester matrix syntactic foams. Vinyl ester resins have lower density, comparable tensile strength, higher modulus of elasticity, and lower coefficient of thermal expansion than epoxy resins. The tensile and compressive properties of vinyl ester matrix syntactic foams are characterized. Results show promise in these materials in marine structural applications.
Click Chemistry Publications - Scripps Research Institute
With the introduction of flexible epoxy-terminated polyether(ETPE) as the monomer, herein, we reported a facile and efficient synthesis approach for novel epoxy vinyl ester resin(EVER-2) with high impact toughness. The resin was analyzed by Fourier-transform infrared(FTIR), 1H nuclear magnetic resonance(1H NMR) and 13C nuclear magnetic resonance(13C NMR) spectroscopy. Mechanical properties such as tensile strength, flexural strength, impact strength and heat distortion temperature were also determined for EVER-2. The cured resin containing 7.9% mass fraction of ETPE has outstanding performance on impact strength. SEM (scanning electron microscopy) analysis reveals that EVER-2 matrix displays a single-phase morphology and its galss fiber/EVER-2 composite(EVERL-2) exhibits better bonding between the matrix and glass fiber, which means that EVERL-2 can bear more impact strength than galss fiber/ EVER-1 composite(EVERL-1). Moreover, plausible toughening mechanisms of EVER-2 and EVERL-2 were proposed.
Preparation, Characterization, and Application of Poly(vinyl alcohol)-graft-Poly(ethylene glycol) Resins: Novel Polymer Matrices for Solid-Phase Synthesis.