Poly degradation behavior structure

Hu, D. S. G., and H. J. Liu, Structural analysis and degradation behavior in polyethylene-glycol poly (L-lactide) copolymers, Journal of Applied Polymer Science, 51(3) 473-482 (1994). 

For TLCPs [-OOC-c )-OOC-c )-COO-c )-COO-R-]m [67], when R is line spacer, Ea was found to be similar to those of polyesters such as PET and PBT, and Ea decreases with increasing numbers of methylene groups in R. Li et al. [84-86] have reported some kinetic data of the X7G analogues, Veetra A with 58/42 molar ratio of pHBA/2,6-HNA, and Ekonol fiber with the same chemical structure units as Xydar. Kinetic data were also used to support the related conclusion about the thermal degradation behavior of the blends of Veetra A950 with Nylon 6 [61] and Veetra B950 with poly(ether imide), etc. [62]. 

Some polymers have both polar and nonpolar groups in the polymer chain. Thermal stability behavior of blends of some such polymers with PVC have also been studied. McNeill and coworkers [149] have studied the degradation of blends of PVC with poly (tetramethyl-ene sebacate) (PTMS). The structure of PTMS is given in Eq. (40). 

A third pyrolysis behavior is evidenced by polymers such as poly(methyl methacrylate). Because of the structure of methacrylate polymers (structure Vll), the favored degradation is essentially a reversion to the monomer. 

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