Fundamentals of Biochemistry. A Textbook by Patel S.V., Golakiya B.A. Gajera H.P.

By Patel S.V., Golakiya B.A. Gajera H.P.

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E. the epoxy/-OH ratio and the extent of side reactions which effectively remove either epoxy or -OH groups and hence alter the effective epoxy/-OH ratio. The important parameters were investigated by Batzer and Zahir (1975, 1977). 5 Phenoxy resins. e. , 1963). Thermoplastic resins with average values of ii of about 100 and average molecular weights of maybe 30 000 to 45 000 are available. These resins may not have terminal epoxy groups, but each repeat unit has a secondary hydroxyl group which is reactive, with, for example, isocyanates.

They are also high in odour, are hygroscopic and have poor compatibility with epoxy resins. This last gives them a tendency to exude during cure giving rise to bloom and carbonation. This can result when amines of poor compatibility are used with epoxy resins - they can exude to the surface after mixing and before cure has trapped them into the matrix. Blooming or blushing as it is also described, refers to the resulting tacky surfaces. Carbonation or water spotting refers to the white patches of amine bicarbonate salts which can appear and mar the surface appearance of cured films.

They do nevertheless exhibit a number of advantages associated with the lack of any free amine induding low odour, and are better suited for application at lower temperatures and higher humidity where bloom, carbonation, loss of gloss and intercoat adhesion criteria are critical. 4 Mannich bases and association salts. An alternative approach developed by Halewood (1962) for overcoming the disadvantages of volatility, irritation and hygroscopicity of the ethyleneamines involves reacting together the amine with phenol and formaldehyde to form low molecular weight condensates or Mannich bases as they are commonly also known.

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