Bisphenol resins

Glass-reinforced polyester is the most widely used reinforced-resin system. A wide choice of polyester resins is available. The bisphenol resins resist strong acids as well as alkahne solutions. The size range is 2 through 12 in the temperature range is shown in Table 10-17. Diameters are not standardized. Adhesive-cemented socket joints and hand-lay-up reinforced butt joints are used. For the latter, reinforcement consists of layers of glass cloth saturated with adhesive cement. 

Bisphenol A resins, 10 5-6 Bisphenol A terminated hardeners, 10 406 Bisphenol F epoxy resin, 10 368-369 Bis(phenolic) developers, 19 346-347 Bisphenol resins, formulation of,... 

Alternatively, a Novolac resin can be used in place of the bisphenol A or F and this gives rise to an epoxy resin with a higher functionahty in terms of epoxide gronps per molecules, such as formula D. Thus, whilst the bisphenol resins have a maximnm of two epoxides per molecule (theoretical maximum, the actual value is slightly less), the Novolac can have up to about 10, the average chain length of commercial Novolacs. 

Bisphenol resin laminate in contact with toluene experiences a 19% weight gain in one month, a swelling of 19%, and hardness drops from 43 to 0, typical of a material undergoing total failm-e. As the solvent attack continues ... 

Figure 17.82 The glass transition of a printed circuit board resin (bromlnated bisphenol resin) determined by DSC and DMA. Source Reprinted from Mettler technical literature.

Bisphenol resin A and its glass fiber Water immersion at 20°C LF Apicella et al. 1983... 

Vinyl ester resins contain fewer ester groups than resins based on glycol fumarate, phthalic acid, or bisphenol. Therefore, VE resins hydrolyze much more slowly, and the molecular mass does not undergo essential changes during hydrolysis, so that the mechanical properties change very little. Vinyl ester resins are therefore considerably more resistant (especially to alkalis) than phthalic acid, isophthalic acid, or bisphenol resins [32]. 

The earliest epoxy adhesives were based on difiinctional bisphenol resins. As the epoxy manufacturers introduced more functional resins, first the epoxy novolacs and then a series of high functionality specialty resins, aero-... 

These resins, more correctly called epichlorohydrin bisphenol resins, are chain-structured compounds composed of aromatic groups and glycerol joined by ether linkages. Various modifying agents are used to produce epoxies of... 

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