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Self-toughening liquid crystalline vinyl ester adhesives
No full textVinyl ester resins are widely used as thermosetting matrices for production of advanced composite and structural adhesives. They are obtained by end-capping unsaturated vinyl groups on a large variety of suitable oligomeric precursor, resulting in thermosetting resin with a good processability and outstanding end-use properties. In this paper we describe the shynthesis of a new methacrylated derivative of p-(2,3-epoxypropoxy)-α-methylstilbene exhibiting liquid crystalline phases, referred to as MD3A2. For the sake of comparison, a model compound has been synthesized with very similar chemical backbone. The model compound, referred to as MEP3A2, features isotropic phase and is derived form the commercially available Epon 825® epoxy resin (Shell Oil Company). Fracture resistance of samples has been tested according to ASTM D1002-72 (Strength Properties of Adhesives in Shear by Tension Loading) on aluminum supports and related to the presence of isotropic or liquid crystalline phases
COPOLYAMIDE/CLAY NANOCOMPOSITES BY MELT COMPOUNDING: MORPHOLOGICAL, THERMAL AND RHEOLOGICAL PROPERTIES
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