By Vladimir Kestelman, Roman Veslovsky
If you would like a common figuring out of polymer adhesion, this booklet isn't for you. it really is for the complicated reader and is overvalued!
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It is evident that decreasing the coating thickness down to about 10 mm has a slight effect on the value of the modulus of elasticity of the epoxy coating, independently of the nature and the energy field of the substrate surface. Apparently, the modulus of elasticity of the polymeric coating in this range of thickness corresponds to that for this material in bulk, where the contribution of the boundary layer is not practically exhibited. 6 Dependence of the elastic modulus of the epoxy coating on thickness on (1) aluminum and (2) polyethylene terephthalate substrate.
11, curve 1). After the particles acquire this size, only growth is observed, with the particle concentration (at which the system separates into phases) increasing with conversion level and consequently with increase of the system viscosity. In the case of OP-10, the system incompatibility occurs at higher conversion levels, which is why the system separation into phases is not observed visually up to 40% of the epoxy group conversion. The processes that occur in the polymerizing system have various effects on its ability to separate into macrophases.
5% of L-19. Additionally, increase of the surfactant content of the liquid oligomer always results in the decrease of the surface tension (naturally when the surfactant concentration in the system is lower than CCMF). The increase of surface tension in the DEG–PEPA system is related to the change of surfactant solubility. The rate of aggregation of the surfactant molecules depends on the viscosity and the chemical composition of the polymerizing oligomer. Increase in system viscos- Adhesive Properties Control by Surface-Active Substances 49 ity means that under the dynamic conditions one cannot always realize the most thermodynamically advantageous surfactant structure, which depends on the relationship of the rates of system polymerization, and on physical-chemical and chemical (in case of RS substances) surfactant conversions.
Adhesion of Polymers by Vladimir Kestelman, Roman Veslovsky