Reinforcing thermosets using crystalline desoxyanisoin structures

Abstract

This article presents results on the potential of using crystalline flame retardants for thermoset reinforcement. The approach involves introducing reinforcement in thermosetting polymers through low molecular weight crystallizable additives. Thermally induced phase separation (TIPS) and crystallization of desoxyanisoin in diglycidylether of bisphenol‐A (DGEBA) epoxy monomer were investigated. Small angle light scattering and polarized optical microscopy were utilized to monitor phase separation and the crystallization of desoxyanisoin in DGEBA at different concentrations. Reaction induced phase separation (RIPS) with polyetheramine was carried out under isothermal and temperature gradient curing conditions. Altering the cure schedule resulted in a rich range of morphologies due to the competition between TIPS and RIPS. During isothermal cure, straight fiber‐like anisotropic crystals on a centimeter length scale developed. In contrast, thermal gradients frustrated the crystal growth and resulted in complex and rich morphologies. Desoxyanisoin provided marginal epoxy thermoset reinforcement at 10 vol %. However, the additive did not increase the thermoset flammability retardancy. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39853.

Development of silver sulfadiazine loaded bacterial cellulose/sodium alginate composite films with enhanced antibacterial property

“…where W 0 is the weight of the composite and V 0 is the volume of the composite, which was measured with the modified method of Lin et al (2014). Briefly, the samples were infiltrated with 99% ethanol in a 25-mL beaker under −0.08 MPa for 5 min in a vacuum oven.…”