Bisphenol bases

Synthesis of Bisphenol-Based Acetylene Teiminated Thermosetting Resins... 

Acetylene-terminated resins (ATR) bisphenol-based, synthesis, 17-29 thermally curable, 6 Acetylene-terminated sulfone (ATS), thermally curable, 5 Acid values, castor oil prepolymer formation, 241 Addition polymerization... 

Asymmetric Olefin Hydrogenation Using Monodentate BINOL- and Bisphenol-Based Ligands Phosphonites, Phosphites, and Phosphoramidites... 

Stewart, J.R. Synthesis and characterization of chlorinated bisphenol-based polymers and poly-carbodiimides as inherently fire-safe polymers. Ph.D. Thesis, University of Massachusetts Amherst, MA, 2000. 

A variety of CEs with tailorable physico-chemical and thermo-mechanical properties have been synthesized by appropriate selection of the precursor phenol [39,40]. The physical characteristics like melting point and processing window, dielectric characteristics, environmental stability, and thermo-mechanical characteristics largely depend on the backbone structure. Several cyanate ester systems bearing elements such as P, S, F, Br, etc. have been reported [39-41,45-47]. Mainly three approaches can be seen. While dicyanate esters are based on simple diphenols, cyanate telechelics are derived from phenol telechelic polymers whose basic properties are dictated by the backbone structure. The terminal cyanate groups serve as crosslinking sites. The polycyanate esters are obtained by cyanation of polyhydric polymers which, in turn, are synthesized by suitable synthesis protocols. Thus, in addition to the bisphenol-based CEs, other types like cyanate esters of novolacs [37,48], polystyrene [49], resorcinol [36], tert-butyl, and cyano substituted phenols [50], poly cyanate esters with hydrophobic cycloaliphatic backbone [51], and allyl-functionalized cyanate esters [52] have been reported. 

To further investigate the question of polymer structure-permeability relationships, this study reports oxygen permeability measurements on a group of structurally varied bisphenol based polymers. In addition to representing commercially important classes of engineering thermoplastics, polycarbonates, polyarylates and polyetherimides can be easily prepared from a common set of... 

Are Polyesters Better Gas Barriers Than Polycarbonates Commercial alkyl terephthalate polyesters exhibit lower gas permeabilities than commercial bisphenol based polycarbonates. On this basis, polyesters are generally classified as good barrier polymers while polycarbonates are typically not regarded as such. Furthermore, the ester functionality has been assigned higher barrier values than the... 

Wang et al. [32] sulfonated bisphenol based wholly on aromatic poly(arylene ether sulfone) (PBPS) at various degrees of sulfonation. The surfaces of the membranes prepared from these polymers were studied by AFM. Figure 8.12 shows AFM... 

Epoxy-novolac resin n. A two-step resin made by reacting epichlorohydrin with a phenol-formaldehyde condensate. Such resins are also known as thermoplastic, B-stage phenohc resins that are in a state of partial cure. Whereas bisphenol-based epoxy resins contain up to two epoxy groups per molecule, the epoxy novolacs may have seven or more such groups, producing more tightly crossHnked structures in the cured resins. Thus they are stronger and superior in other properties. 

Conventional Route for Industrial Scale Production of Bisphenol-Based Copolymer Used in Manufacture of Polycarbonate Resins... 

A bisphenol based gelcoat offering superior chemical (alkali) resistance. 

An unaccelerated bisphenol based resin of good mechanical properties and chemical resistance. 

An unaccelerated, non-waxed, rapid-cure bisphenol-based resin for corrosion-resistance and suitable for both hand-lay and spray/projection lamination. Also suitable for filament winding, centrifugal moulding and pultrusion. 

Figure 5.359 Exposure of glass fiber-reinforced, crosslinked polyester resin (bisphenol-based unsaturated polyester resin with randomly oriented E-glass fiber-reinforced mat) in hot water pure resin content was calculated as the product of change in pure resin with resin content in the glass fiber reinforced material Wg = weight before exposure, = weight after exposure to water, fKrf = weight after re-drying [874]...

Phthalic and isophthalic resins are hydrolyzed by 60 °C hot water here, the rate of hydrolysis noticeably increases with temperature. The water washes the hydrolysis products out of the resin. Because this process superposes absorption, weight change in glass fiber-reinforced polyester resins caused by exposure to warm water is lower than caused by water at 20 °C. At 100 °C, however, the effect of water on glass fiber-reinforced phthalic and isophthalic resins results in severe weight loss and the formation of deposits in water, a clear indication of degradation. Bisphenol-based resins are more resistant to water. Table 5.116 [32]. 

Scheme 102 Spirobiindane bisphenol-based cyclic carbonate.

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