Polyesters with aromatic groups in the backbone

CAS 25302-46-9, poly(resorcinol isophthalate) CAS 26618-61-1, poly(hexamethylene terephthalate) CAS 58517-23-0, etc. 

A number of studies were done to assess thermal stability of aromatic polyesters. Some of these studies describe flash pyrolysis [27-32]. Some studies are dedicated to slow thermal degradation in an inert atmosphere, and others describe the decomposition in specific conditions such as in the presence of humidity or in the presence of catalysts [33]. For example, thermal decomposition of poly(butylene terephthalate) was significantly influenced by the presence of water vapor, and the amount of the residues decrease with increasing the partial pressure of water in the atmosphere [34]. In another study, thermal stability of some small molecule phthalate esters was studied [35]. The results can be used for inferring information on the thermal stability of related polymers. The influence of substitution on the p-carbon atom was evaluated on compounds such as bis(2-aminobutyl) phthalate, bis(2-nitrobutyl) phthalate, bis(2,4-diphenylbutyl) phthalate, and dineopentyl phthalate. Only the phenyl groups were found to improve the heat resistance by the obstruction of the planar configuration necessary for the c/s-elimination and the hindrance of the formation of a six-membered cyclic transition state. 

A summary regarding literature information describing the thermal decomposition of polyesters with aromatic groups in the backbone chain is given in Table 10.1.6. 

33Q monomer, cyclic dimer to heptamer 505-565 CO. COj. phenol, p-hydroxyphenyl benzoate 

Polymer poly(oxydecB-methyleneoxyiere phlhaloyl) poly(OKyethylene-oxyterephthaloyl) or poly(ethylene terephihalate) 

---