By Y. Jack Weitsman
Fluid results in Polymers and Polymeric Composites, written by means of the past due Dr. Y. Jack Weitsman, addresses the big variety of parameters that have an effect on the interplay of fluids with polymers and polymeric composites. The booklet goals at broadening the scope of obtainable info, normally constrained as much as this time to weight-gain recordings of fluid ingress into polymers and composites, to the sensible conditions of fluctuating publicity. numerous different types of experimental info are given, together with theoretical versions derived from uncomplicated medical ideas, and correlated with severity of publicity stipulations and interpreted through rationally established theoretical types. the sensible implications of the results of fluids are discussed.
The factor of fluid results on polymers and polymeric composites is of outrage to engineers and scientists lively in aerospace and naval buildings, as an expanding section of those constructions are made from polymeric composites and hire polymeric adhesives as a becoming a member of equipment. whereas the booklet is meant for this viewers, it's going to additionally curiosity researchers and graduate scholars attracted to the mechanics and fabrics features of this matter.
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The above processes can thus be decoupled. 2. Capillary motion occurs at about 6 orders of magnitude faster than diffusion. Both processes can be decoupled, with consequent ramifications for diffusion and damage. 3. Wicking along the fiber/matrix interphase occurs about 10 times faster than diffusion within the polymeric phase. The two phenomena are weakly coupled. 4. Diffusion and polymeric creep occur on approximately similar time-scales. Except for the limiting cases of very thin or very thick plate thicknesses these phenomena are inherently coupled.
2. 7 Diffusion Associated with Chemical Reaction In several circumstances when a solid is exposed to a specific harsh environment a chemical reaction takes place that transforms the atomic or molecular structure of the solid and splits it into two phases. Such events may occur within polymers exposed to acids, glass fibers exposed to water, silicon exposed to oxygen, etc. In this case, the reaction-modified phase arises within the region containing the diffusing molecules, while the unreacted phase remains outside the region where diffusion takes place.
61 F ) 3kPETU Bullions et al. 0002 1 F Bullions et al. 9 + 22 Â 103/T ( K) Polyester Phenolic Vinylester A Vinylester B Glass/Polyester Glass/Phenolic Glass/Vinylester A Glass/Vinylester B T300/5208 AS/3501-5 5208 3501-5 P(AA) P(HEMA) P(VIM) PMMA P(MeOx) P(Etox) P(NIPAM) P(DNAEMA) Loos and Springer (1981) Jacob et al. private communication Van Landingham (1997) Rao et al. (1984) Bonniau and Bunsell (1981) Nicolais et al. (1985) Althof (1979) Grayson and Wolf (1985) Aiello et al. 44% M1 under water immersion consistently exceeds (by 25–50%) M1 under exposure to RH = 95% Nicolais et al.