Polymerization of dicarboxylic acids

Polyester polyols (Scheme 4.4) are prepared by condensation polymerization of dicarboxylic acids and diols. An excess of diol ensures OH functional product, minimizing die possibility of residual acid groups which react with isocyanates to generate C02 and act as inhibitors in catalyzed urethane reactions. The reactants are heated at 200-230°C under vacuum to remove the water by-product and drive the reaction to completion. The most common coreactants include adipic... 

Polymerization of Dicarboxylic Acids or Their Derivatives with Glycols... 

The polymerization of dicarboxylic acids and glycols using lipase CA catalyst proceeded in a solvent-free system, despite the initial heterogeneous mixture of... 

Fig. 3. Proposed mechanism of polymerization of dicarboxylic acid divinyl ester and glycol through lipase catalysis...

Polyesters containing aromatic moiety in the main chain were synthesized by lipase CA-catalyzed polymerization of dicarboxylic acid divinyl esters and gly-... 

Lipase-Catalyzed Polymerization of Dicarboxylic Acids or Their Derivatives. Enzymatic synthesis has been achieved via various combinations of dicarboxylic acid derivatives and glycols. As to the diacid monomer, dicarboxylic acids, activated and nonactivated esters, cyclic acid anhydrides, and polyanhydrides were enzymatically reacted with glycols under mild reaction conditions. 

Unsaturated polyester resins are the cheapest and best material in the composites industry and represent approximately 75% of the total resins used. Thermoset polyesters are produced by the condensation polymerization of dicarboxylic acids and drfunctional alcohols (glycols). In addition, imsaturated polyesters contain an unsaturated material, such as maleic anhydride or fumaric acid, as part of the dicarboxylic... 

FIGURE 8.3 Synthesis of various PBIs via condensation polymerization of dicarboxylic acid diphenyl esters and tetraamines. (From Vogel, H. and Marvel, C.S., J. Polym. ScL, L, 511, 1961.)... 

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