Polymers epoxy resin

Polycarbonates. Currently, all audio CDs (CD-AD), all CD-ROM, and the biggest fraction of substrate disks for WORM and EOD worldwide are manufactured from a modified bisphenol A—polycarbonate (BPA-PC) (3). In 1991, some 1.3 x 10 compact disks were produced, equivalent to an annual amount of about 35,000 t BPA-PC. WORM and EOD disks are manufactured mainly from BPA-PC for sizes of 5.25 in. and below, and glass for larger form factors (eg, 12 in.), partially also from BPA-PC, and in some cases from aluminum or from cross-linked polymers (epoxy resins) (190). 

Step Non-linear Network Polymers Epoxy resins Melamine Phenolic Polyurethanes Urea... 

For webs, the substrate electrode is usually a vapor-deposited, semitransparent metal layer (Ritchie and Fenn, 1987 Chen, 1993). Al, Ni, and Cr are commonly used. The use of semi-transparent electrodes permits the use of rear exposures for erase purposes. In the case of drums, the metal cylinder serves as the electrode. Usually, a thin, less than 1 pm, blocking layer is interposed between the electrode and the photoreceptor to prevent charge injection. This layer must not be so thick that a residual potential builds up during cycling. Many insulating polymers have been used acrylic polymers, epoxy resins, polyamides, polyesters, polyphosphazenes, polysiloxanes, polyurethanes, vinyl polymers, etc. 

Performance Polymers epoxy resins and other thermosets. 

The basic determinant of the final properties of a cured polysulfide polymer/epoxy resin compound is the weight ratio of liquid polymer to epoxy resin. By varying this ratio, the formulator is able to develop the optimum properties for a specific application. The effect of varying LP/EP ratios on the properties of a typical compound is shown in the following table. 

Fettes and Gannon were the first to report reactions of liquid polysulfide polymers with epoxy resins [16]. In these adhesives, the epoxy resin is the major component. The polymer LP-3 in which n = 8 has been used most extensively. This polymer has a moleeular weight of about 1000 with viscosity in the range 7 to 12 P. The epoxy resins most widely used in adhesive formulations have viscosities the range 80 to 200 P with an epoxy equivalent of 175 to 210. Typical resins are Epon 820 and 828 (Shell), ERL-3794 (Union Carbide), and Araldite 6020 (CIBA). The epoxy-polysulfide reaction is prompted by organic amines (e.g. diethylenetriamine and benzyldimethylamine). The general reaction of a polysulfide polymer, epoxy resin, and amine hardner is... 

Curable polymers epoxy resins, nitroparaffin, and nitrated polystyrene... 

Epoxides, polymers, epoxy resins. See Epoxy resin... 

Synonyms Condensation prods., epoxy Epoxides, polymers, epoxy resins Epoxy compds. Ethers, cyclic, epoxides, polymers Plastics, epoxy Polyethers, epoxy resins Classification Polymer... 

Synonyms Condensation prods., epoxy Epoxides, polymers, epoxy resins Epoxy compds. Ethers, cyclic, epoxides, polymers Plastics, epoxy Polyethers, epoxy resins Classification Polymer Definition A thermosetting resin based on the reactivity of the epoxide group Toxicology LD50 (oral, rat) 2200 mg/kg strong skin irritant in uncured state poison by inhalation moderately toxic by ingestion little or no toxicity in cured state Hazardous Decomp. Prods. Heated to decomp., emits toxic fumes of Cr... 

Like all polymers, epoxy resins contain a mixture of molecular species. Not all molecules are terminated at both ends by epoxide groups. Low molecular weight diluents, containing perhaps one epoxy ring, are often included to make the diepoxide 0 types less viscous. Resins containing these diluents are described as modified epoxies. The solvents for epoxy resins are given in Tables 9.1 and 9.3. It should be noted that the petroleum hydrocarbons are non-solvents. 

Uses intermediate in the manufacture of polymers, epoxy resins, acrylic resins, polycarbonates, fungicides, antioxidants, dyes, phenoxy, polysulfone and certain polyester resins, flame retardants and rubber chemicals component in semisynthetic waxes polycarbonate resins (60%), epoxy resins, (30%), polysulfone, polyetherimide and polyacrylate resins (10%) flame retardants (mainly tetrabromobisphenol-A), unsaturated polyester... 

Among thermosetting polymers, epoxy resins are characterized by the highest chemical and corrosion resistance, in addition to optimal resistance to attack from seawater. For these reasons, these thermosetting resins represent the best choice as matrices for composite structures that must retain their mechanical and physical properties and not degrade when immersed in seawater or in a... 

In comparison with other thermosetting polymers, epoxy resins are more expensive but show better mechanical properties, lower shrinkage, and higher resistance to moisture absorption and to corrosive environments. These good physical properties and their durability in service help to provide a favorable cost-performance ratio when compared to other thermoset plastics. 

Tetrabromobisphenol A (4,4 -isopropylidenebis(2,6-dibromophenol) TBBPA) is the most widely used BFR in terms of production quantities [2]. It is used as both a reactive and an additive BFR in a variety of polymers, epoxy resins, and adhesives and, in particular, is a constituent in printed circuit boards at levels up to 34% (mass fraction). The acute toxicity of TBBPA is relatively low however, concern for its potential as an endocrine disrupter exists. TBBPA shares structural similarities to thyroxine (T4), and the compoimd competitively binds to the thyroid hormone transport protein transthyretin [135]. Analysis by gas chromatography requires derivitization, and LC methods are preferred to reduce sample processing. Biotransformation of TBBPA... 

ADHESIVES FROM POLYSULFIDE LIQUID POLYMER-EPOXY RESIN REACTIONS... 

EPA. See Propylene glycol ethyl ether acetate Eicosapentaenoic acid Epihydrin alcohol. See Glycidol Epoxides, polymers, epoxy resins. See Epoxy resin Epoxidized butyl esters of linseed oil fatty acids. See Epoxidized linseed oil, butyl ester... 

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