Adhesion of Polymers by Vladimir Kestelman, Roman Veslovsky

By Vladimir Kestelman, Roman Veslovsky

If you would like a normal figuring out of polymer adhesion, this e-book isn't for you. it truly is for the complex reader and is overvalued!

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42 Chapter Two there appear the creation of the three-dimensional network, the compatibility of which with the low-molecular weight substances is sharply decreased. The increase of aggregation of the surfactant molecules and the transformation of micelles of one type into another one was confirmed by a study of the light scattering of the surfactant solutions of various concentrations with various levels of system conversion. Note that the oligomers investigated involve colored products that hinder the detection of the small-sized colloid particles.

The system viscosity was varied from 5 to 500 PaÁs by adding different quantities of PEPA to the resin. 18C/min. At high conversion levels the rate of building to equilibrium decreases, although the rate of polymerization in the last stages of the reaction is rather low, so it can be assumed that in this case the observed surface tension will not differ noticeably from its equilibrium value. Thus, there is opportunity for processes of completion of system polymerization and achieving the equilibrium surface tension to coincide.

At low degrees of epoxy conversion, CCMF of OP-10 does not change (see Fig. 7, curves 1–3). Only at 30% conversion does CCMF begin to decrease (curve 4). With increase of the degree of conversion, one observes the decrease of the system surface tension at the surfactant concentration that corresponds to CCMF. The kink on the surface tension isotherm at low surfactant concentrations can be related to the formation of the surfactant ‘‘pre-associations’’ in the system. 7 Isotherms of the surface tension of OP-10 solutions in DEG-1 at various conversion levels of the epoxy groups: (1) 5%, (2) 10%, (3) 20%, and (4) 30%.

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