These peaks can be assigned to the degradation of the polymer chains. Ethylene glycol electrooxidation in alkaline medium at multi-metallic Pt based catalysts. isophthalate; phthalic acid; Translations isophthalic acid (uncountable) (organic chemistry) The isomer of phthalic acid benzene-1,3-dicarboxylic acid used in the synthesis of polymers. This alcohol can be synthesized through fermentation or other chemical processes. This white solid is a commodity chemical, used principally as a precursor to the polyester PET, used to make clothing and plastic bottles. Several million tonnes are produced annually. Terephthalic acid is an organic compound with formula C6H4(CO2H)2. 1. The absence of absorption at 1711 cm-1 (assigned to –COOH dimmers) evidenced that the esterification reaction was almost complete for all the polyester, therefore the absorption between 3300-3000 cm-1 is associated to adsorbed water and un-reacted –OH groups (POLF I and POLF II) from glycerol (Table 2). Phthalic anhydride is the principal commercial form of phthalic acid and it is presently manufactured by catalytic air oxidation of o-xylene or naphthalene. In this context, bio-diesel achieves many of the requirements, since its combustion produces no toxic gases like sulphur oxides, nitrogen oxides are produced during its combustion. Phthalic Anhydride (PA) is used as the major ingredient in the manufacture of plasticizers, unsaturated polyester resin, paint and others. The decomposition of the polymer backbone took place at temperatures higher than 305 °C, and corresponded to the most important and fastest decomposition pathway of the POLF polymers. Table 1.8 - Typical properties of polyesters polyols [ Links ], 14. Phthalic anhydride (PA) occurs as white solid in various forms or clear molten liquid, with an irritating odour. It is a white crystals decomposing at 191°C and slightly soluble in water and ether. Thermal stability of poly(trimethylene terephthalate). This first step is related to the elimination of residual (or adsorbed) water molecules. 12. http://www2.basf.de/basf2/html/plastics/englisch/pages/konstr/ultradu.htm#sub02 (accessed on 08/11/2006). This is a linear polyester (XI) of high molecular weight which is obtained by condensing terephthalic acid (in the form of its dimethyl ester) with ethylene glycol. Polyurethane elastomeros that have improved physical properties and procedure for their production. The properties of phthalic acid lend themselves to the laboratory preparation of a polyester, but the melting point of this particular polyester is too low for commercial use as a fiber or film. 37. United States Patent 4618699 . 3.2.2. Guanabara: Koogan; 1994. Epub 2013 Jul 16. Adipic acid based polyester polyols are used in applications where flexibility is wanted, as in flexible foams and elastomers. The formulation used for the POLF syntheses are summarized in Table 1. 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