Polyester monomers

Diols are applied on a multimilhon ton scale as antifreezing agents and polyester monomers (ethylene and propylene glycol) [58]. In addition, they are starting materials for various fine chemicals. Intimately coimected with the epoxidation-hydrolysis process, dihydroxylation of C=C double bonds constitutes a shorter and more atom-efficient route to 1,2-diols. Although considerable advancements in the field of biomimetic nonheme complexes have been achieved in recent years, still osmium complexes remain the most efficient and reliable catalysts for dihydroxylation of olefins (reviews [59]). 

Use Cross-linking agent for polyesters monomer for polymerization. 

Properties White crystals. Mp 114-116C (decomposes). Slightly soluble in water, cool 5% alkaline solution, and alcohols moderately soluble in oxygenated organic solvents and polyester monomers slightly soluble in naphtha, carbon tetrachloride, and chloroform insoluble in benzene. 

Given the use of 1,3-propanediol as a polyester monomer, the oxidation of acrolein and the conversion of the product to 1,3-propanediol were investigated in more detail. 

One approach is the copolymerization of caprolactone with other cyclic monomers that nndergo ROP, namely, lactide, glycolide [70], or fnnctionalized epoxides [62,63]. In these systems, the second monomer is considered to bear the desired functionality or chemical moiety, and therefore, a wide range of novel functionalities and polymer properties are accessible. Statistical copolymers of caprolactone with lactides and glycolides are discussed earlier [70]. Beside these commonly used polyester monomers, a variety of other functional cyclic esters are described. Cyclic esters... 

Chromophoric complexes of polyester monomer, dimer, and trimer have approximately the same absorbance at a given wavelength per terephthalyl equivalent. Since the oligomer equivalent per terephthalyl group is also approximately the same, the equal UV weight response assumption appears to be valid. 

Anaerobic locking compounds are unsaturated polyester monomers such as dimethacrylates whose cure (polymerization) is inhibited by atmospheric oxygen. When oxygen is excluded from the bond line, as in the case of threaded fasteners, the resin reacts and the resulting bulk solid locks the parts together. 

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