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Effect of Excess Silane on the Viscoelastic Behavior of Epoxy Under Hygrothermal

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Effect of Excess Silane on the Viscoelastic Behavior of Epoxy Under Hygrothermal Conditions

 

Organo-functional silanes are used in fiber surface treatments to improve adhesion between fiber and matrix. It is hypothesized that the presence of excess silane within the matrix can degrade its properties. This study investigates the influence of excess organofunctional silane on the elastic and viscoelastic properties of epoxy resin system under hygrothermal conditions. Samples are prepared by adding (3 - glycidyloxypropyl) trimethoxysilane (GPTMS) in wt. percentages from 0.5 to 8 to epoxy which is cured using an amine based hardener and subsequently subjected to water degradation at 21 C and 50 C. Gravimetric measurements for 48 hours are conducted to monitor the degree of moisture absorption of the samples. Nanoindentation is used to characterize the variations in mechanical properties under impact of addition of silane and hygrothermal degradation. Elastic modulus and creep resistance data indicate that the addition of silane deteriorates the mechanical properties under study of the epoxy resin. Fourier transform infrared spectroscopy (FTIR) of the non-degraded and hygrothermally degraded samples showed no substantial chemical change indicating that silane is well consumed in epoxy resin. 

 

Author: Libin K Babu

 

Conference: SAMPE Seattle 2017

SKU/Code: SE17--0849

Pages: 12

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