Accession Number : ADA306102

Title :   Thermal Degradation of Polyesters: Part 2. Aromatic and Semiaromatic Polymers.

Descriptive Note : Technical rept. 1 Jul 67-1 Jul 68,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Goldfarb, I. J. ; McGuchan, R.

PDF Url : ADA306102

Report Date : OCT 1969

Pagination or Media Count : 57

Abstract : A detailed study was made of the thermal degradation of eight aliphatic polyesters and the results presented in Part I of this report. The results of a corresponding study of some polyesters containing aromatic rings in the polymer chain are now presented in Part II. Poly(hexamethylene terephthalate) degrades by the mechanism observed for aliphatic polymers--random scission and subsequent reaction of the olefinic and acid end-groups. when the acid part is aliphatic as in poly(1, 4-phenylene succinate) and poly(1, 4-phenylene sebacate), the polymers are less stable initially than comparable aliphatic polyesters. The degradation mechanism is more complex and involves cross-linking; the cross-linked sebacate product breaks down by a second degradation reaction but the succinate forms a residue which does not undergo further breakdown. jg p5

Descriptors :   *POLYMERS, *AROMATIC COMPOUNDS, *THERMAL DEGRADATION, *POLYESTER FIBERS, DEGRADATION, ALIPHATIC COMPOUNDS, CHAINS, METHYLENES, RINGS, PHTHALATES, POLYPHENYLENES, THERMOGRAVIMETRIC ANALYSIS.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE