Mechanical properties and structure of solvent processed novolac resin/layered silicate: development of interphase region
2015
Jahanmard, Parisa | Shojaei, Akbar
Composites of phenol-formaldehyde (PF) resin with Closite Na⁺ and Closite 30B up to 20 wt% loadings were prepared by solution mixing. Tensile testing showed that both pristine and organically modified clays increased considerably the mechanical properties of PF resin at 2.5 wt% loading followed by marginal improvement or even sacrificed properties at high loadings. DMA and DSC analyses suggested development of a highly crosslinked and well adhered interphase around silicate layers. A novel three-phase model considering the interphase region was proposed to predict composite modulus. The model was successfully employed to correlate morphological characteristics and mechanical properties of PF/clay composites.
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