A moisture absorption and adhesion study of the process of blending film using p‐alkylphenol‐resorcinol‐formaldehyde and rubber latex

Abstract

p-alkylphenol-resorcinol-formaldehyde-latex (ARFL) films were prepared by co-condensation of p-alkylphenols and resorcinol with formaldehyde to generate modified phenolic resins, followed by blending with rubber latex, aging, and finally curing. The weight-gain of the ARFL films and the tensile force of the coated fiberglass were studied under different temperatures and various humidities. The surfaces of the ARFL films were further analyzed by measuring the static contact angle and the findings were confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis. The adhesion between the coated fiberglass and neoprene rubber was evaluated using the H-adhesion technique. The best hydrophobicity and the largest water contact angle were displayed on the surface of the p-nonylphenol-resorcinol-formaldehyde-latex (NRFL) film, with a weight-gain percent that was 40.0% (wt %) lower and a static contact angle that was 22.6 more than that of the resorcinol-formaldehyde-latex (RFL) film. The NRFL-coated fiberglass had a higher tensile force and H-adhesion force than the RFLcoated fiberglass. The shelf life of NRFL-coated fiberglass can be raised significantly at 40 C and under 98% humidity. The mechanism of the dramatic drop in the tensile force of the coated fiberglass is also discussed.

Failure behavior of resorcinol–formaldehyde latex coated aramid short‐fiber‐reinforced rubber sealing under transverse tension

“…The aforementioned value of t refers to the interphase thickness of the fiber‐reinforced composites obtained from secondary ion mass spectroscopy and atomic force microscopy . The tensile modulus of the interphase was determined by the dry weight ratio of RF to L, as shown in Table . The dry weight ratio of RF to L in this study was between 0.18 and 0.2; this corresponded to values of 41.52–62.76 MPa.…”

Effect of montmorillonite on moisture resistance of the rubber-modified phenolic on fiberglass

“…2 Shaw developed a fiberglass coating without RFL by using a rubber impregnation. 3 Shen et al 4 introduced a hydrophobic alkyl chains into phenolic to delay moisture to penetrate into the interface of fiberglass coating.…”