Polymeric condensation, additive films

The structure of CP films is directly related to the synthesis method. There are currently a variety of methods being explored to fabricate CP films. The two major categories are chemical and electrochemical. Chemical synthesis proceeds from condensation or addition polymerization. Condensation polymerization is driven by the thermodynamically favorable formation of small stable molecules such as HCl or water. Addition polymerization can involve radical, cation, or anion intermediates which are characteristic of the polymerization mechanism. A common alternative to chemical polymerization is through electrochemical methods. The most attractive... 

The AES results indicate that the aniline coverage is more than two times greater than the maximum coverage based on van der Waals radii. The TPR results show this species is too stable to be a condensed multilayer. Hence, we conclude that aniline polymerized forming a very stable polymer layer. In addition, the absence of infrared bands corresponding to C=C stretches or ring vibrations indicated that the poly(aniline) film was formed with the phenyl rings parallel to surface. The infrared results also indicated that the poly(aniline) film had N-H bonds which were oriented perpendicular relative to the surface. 

To perform addition and condensation polymerization and solvent casting of films. 

While increasing chain length, often with dicationic aqueous substrates, can help promote a condensed state that facilitates polymerization, similar effects can be achieved by lowering the temperature. It is, however, very important to define the temperature ranges where expanded or condensed or both states may exist. In addition, consideration of film stability, in so far as it is significant in achieving a polymerized state, should be taken into account. In this paper, we present temperature dependent studies of the physical states of films of two simple diacetylenic fatty acids, tricosanoyl and pentacosanoyl-10 12-diynoic acids. We also report the results of spectral studies of polymerized films under carefully defined conditions of the shorter chain acid, both at the air/water interface and on glass substrates. 

The environmental relative humidity is an additional factor to be considered during the phase separation process in polymer blends. Two different situations have been described depending on the condensation, or not, of water onto the polymeric films. 

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