Ether of bisphenol

TetrabromobisphenolA. TBBPA is the largest volume reactive flame retardant. Its primary use is in epoxy resins (see Epoxyresins) where it is reacted with the bis-glycidyl ether of bisphenol A to produce an epoxy resin having 20—25% bromine. This brominated resin is typically sold as a 80% solution in a solvent. TBBPA is also used in the production of epoxy oligomers which are used as additive flame retardants. 

Numerous avenues to produce these materials have been explored (128—138). The synthesis of two new fluorinated bicycHc monomers and the use of these monomers to prepare fluorinated epoxies with improved physical properties and a reduced surface energy have been reported (139,140). The monomers have been polymerized with the diglycidyl ether of bisphenol A, and the thermal and mechanical properties of the resin have been characterized. The resulting polymer was stable up to 380°C (10% weight loss by tga). 

Epichlorohydrin and Bisphenol A-Derived Resins. The most widely used epoxy resins are diglycidyl ethers of bisphenol A [25068-38-6] (1) derived from bisphenol A [80-05-7] and epichlorohydrin [106-89-8],... 

The pure diglycidyl ether of bisphenol A [1675-54-3] DGEBA is a crystalline soHd (mp 43°C) with a weight per epoxide (WPE) = 170. The typical commercial unmodified Hquid resins are viscous Hquids with viscosities of 11—16 Pa-s (110—160 P) at 25°C, and an epoxy equivalent weight of ca 188. 

Advancement Process. In the advancement process, sometimes referred to as the fusion method, Hquid epoxy resin (cmde diglycidyl ether of bisphenol A) is chain-extended with bisphenol A in the presence of a catalyst to yield higher polymerized products. The advancement reaction is conducted at elevated temperatures (175—200°C) and is monitored for epoxy value and viscosity specifications. The finished product is isolated by cooling and cmshing or flaking the molten resin or by allowing it to soHdify in containers. 

Bais resin = diglycidyl ether of bisphenol A (wtper epoxide (WPE) = 182-196). 

Diglycidyl Ether of Bisphenol A. The Hquid DGEBPA-based resins exhibit low acute toxicity with a single-dose oral LD q value in rats of >2000 mg/kg (40). The potential for absorption of DGEBPA through the skin in acutely toxic amounts is low. LD q values of >800 mg/kg for acute dermal toxicity have been obtained from studies using both the pure and commercial DGEBPA (41,42). 

Diethylene glycol Diethylene glycol ether Di-(2 ethyl hexyl) phthalate Diethylenetriamine Difluorodibromomethane Difluorodichloromethane Diglycidyl ether of Bisphenol A Dihydrocapsaicin... 

A different variety of copolymer has been prepared by Gramain and Frere who treated 1,10-diaza-l 8-crown-6 with the bisglycidyl ether of bisphenol A. The reaction was conducted at reflux in a mixture of THF and methanol. The polymer, illustrated in Eq. (6.24) was formed 83% yield. The polymer was appparently quite stable, surviving aging tests conducted over a two-year period. 

Applications with real composites have been performed in order to verify the results so far outlined. Namely, a metalfilled epoxy composite was selected, whose matrix material was a diglycidyl ether of bisphenol-A resin, cured with 8 percent by weight of the resin, triethylene-tetramine. 

BIS(HYDROXYETHYL) ETHER OF BISPHENOL A. AN APPROACH TO THE CHEMICAL RECYCLING OF PLASTIC WASTES AS MONOMERS... 

A method of converting polycarbonate (PC) to bishydroxyethyl ether of bisphenol A (BHE-BPA) was studied, with a view to recycling PC plastic wastes. Treating PC in ethylene glycol with a catalytic amount of sodium hydroxide produced the monohydroxyethyl ether of bisphenol A (MHE-BPA, 42%), BHE-BPA (11%) and BPA (42%). BHE-BPA was produced quantitatively when 1.6 mol. equiv. ethylene carbonate was added to this reaction system. The reaction of BPA with EC produced both BHE-BPA and MHE-BPA, indicating that ethylene carbonate was formed as an intermediate in the base catalysed reaction of PC with ethylene glycol. A large proportion of this ethylene carbonate formed from PC was, however, lost by decarboxylation so additional ethylene carbonate must be provided for the quantitative preparation of BHE-BPA. 12 refs. 

Diglycidyl ether of bisphenol A (DGEBA, MW 340 Da) and 4,4 -dihydroxy-diphenylmethane (DHDPM, MW 200 Da) were analysed by SEC-MALS [784]. DGEBA and DHDPM are the basic oligomers of epoxy resins and phenol-formaldehyde condensates, respectively, which are widely used in the electronic and automotive industries. Excellent reproducibility ( 1 %) and good accuracy (better than 10%) were observed. SEC has also been used for the determination of mineral oil in extended elastomers [785] and in PS [178]. With heptane containing 0.05% isopropanol as the mobile phase, mineral oil is completely unretained and elutes before the solvent via SEC all other components in a PS extract are retained on silica and elute after the solvent peak. 

CBS, CZ (V-Cyclohexyl-2-benzothiazole DGEBA Diglycidyl ether of bisphenol A... 

Shell s Epon 828, a blend of oligomers of diglycidyl ether of bisphenol A (DGEBA, n=0), was used. 

Dezincing, lead refining by, 14 754-755 DGEBA-aromatic polyamine adduct system, 10 416, 417. See also Diglycidyl ether of bisphenol A (DGEBA)... 

This paper describes the synthesis and characterization of a new zwitterionic water-soluble thiosulfate polymer (Poly[7-(amino -thiosulfate) etheij-PATE) via chemical reaction of a diglicydyl ether of bisphenol A (DGEBA) with aminoethane thiosulfuric acid (AETSA) as a reactive... 

Figure 4. Preparation of the bis-(4-nitrophenyl) ether of bisphenol A via reaction of bisphenol A disodium salt with 4-chloronitrobenzene. Bis salt = biS (4 dihexylaminopyridinium) decane dibromide. Mono salt = N-(2-ethylhexyl) 4-dihexylaminopyridinium mesylate.

DGEBPA diglycidyl ether of bisphenol-A LOST lower critical solution temperature... 

The precursor monomers used to build up a highly crosslinked network are shown in Scheme 1 and consist of diglycidyl ether of bisphenol-A (DGEBPA) and 2,2 -bis(4-amino-cyclohexyl)propane (PACP). 

Wang, D. and Jones, F.R. (1994). TOM SIMS and XPS study of the interaction of aminosilanised E-glass fibers with epoxy resins. Part I. Diglycvdyl ether of bisphenol S. Composites Sci. Technol. 50, 215-228. 

Figure 2. Solid-state spectra of four different epoxies (hosed on the resin diglycidyl ether of bisphenol-A) are compared with the liquid-state spectra of their respective unreacted components, The chemical compositions are in Table I. Here the epoxies are identified by their main curing agent (a) PIP—piperidine (b) MPDA—metaphenylene diamine (c) HHPA—hexahydro-phthalic anhydride (d) NMA—nadic methyl anhydride.

Yamani and Young (5) applied the theory to explain the plastic deformation of a diglycidyl ether of bisphenol A (DGEBA) epoxy resin cured with various amount of triethylene tetramine (TETA). They found that the theory gave a reasonable description for the resins below the glass transition temperatures T. ... 

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