By Vladimir Kestelman, Roman Veslovsky
If you'd like a normal realizing of polymer adhesion, this booklet isn't really for you. it really is for the complex reader and is overvalued!
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Additional info for Adhesion of Polymers
2 presents CCMF ðCk Þ, areas occupied by the molecules in the extremely saturated adsorption layer ðSmax Þ, and surface activity ðGÞ for OP-10 and L-19 in epoxy resins. CCMF was determined by the kink in the curves (Fig. 1). 1 Isotherms of surface tension of DDM (1) and L-19 (2) solutions in DEG-1 at 208C. Surface activities were determined by G¼ À k ck ð2:7Þ where is the surface tension of the oligomer, and k is the same but at surfactant concentration equal to CCMF. 5-fold, although these substances are of similar structure.
Below a certain conversion level in the system of POPT cured by reaction with TDI and DDN, there is growth of the colloid particles, caused by the decline of the solubility of DDN in the oligomer. It is interesting that the increase of particle size is accompanied by a decrease of their concentration. It seems that from the energetic point of view the existence of particle of a certain comparatively large size is most advantageous and the amount of surfactant separated from the system is insufficient to compensate the decrease of the particle concentration due to the increase of their volume.
A study using the turbidity spectrum showed (Fig. 5) that the decrease of the colloid particle concentration occurs in line with the decrease of the colloid particle size. 3). Let us review the information acquired. As shown above, the solubility of PR in the system is higher than that of OAA. At the beginning of the reaction when the PR concentration is low, the PR are in the molecular-dispersed state, which is why they do not affect the determined size of the colloid particles in the system. As Fig.