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The effect of moisture on the mechanical behavior of a nylon‐epoxy adhesive
Author(s) -
Agarwal Pawan K.
Publication year - 1979
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760191310
Subject(s) - materials science , epoxy , composite material , creep , isothermal process , moisture , adhesive , nylon 66 , plasticizer , nylon 6 , atmospheric temperature range , crystallite , polymer , thermodynamics , metallurgy , physics , polyamide , layer (electronics)
Abstract The mechanical properties of a commercial nylon‐epoxy resin have been studied using a sensitive creep apparatus which employs a frictionless levitation magnetic bearing. Isothermal creep measurements over a temperature range of 30‐170°C and covering a time scale of five decades were made on the wet and dry state of the material. Following the usual time‐temperature reduction scheme, master curves for each state were constructed from the experimental data. The effect of moisture was found to be more than that of a simple plasticizer. The steepness of the reduced curves in the transition region was determined and the distribution function of retardation times of the two states of the sample were calculated. The problem of predicting the physical state of the bulk adhesive at higher temperatures was found to be complicated, possibly due to the presence of nylon crystallites.