Accession Number : ADA188532

Title :   Chemical Degradation and Stress Cracking of Polycarbonate in DS2.

Descriptive Note : Final rept.,

Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s) : Lee, Lidia A ; Vanselow, Janice J

PDF Url : ADA188532

Report Date : Sep 1987

Pagination or Media Count : 20

Abstract : Polycarbonate (PC) undergoes loss of physical integrity and ultimate dissolution in the decontaminant DS2. In order to gain a better understanding of this process, this study evaluates the effects of each of the three components of DS2 on PC. Weight loss measurements of PC in DETA (70%), MCEL (28%) and MCEL+NaOH (2%) show that DETA is the most aggressive component in DS2. The FTIR spectra of PC/DETA, PC/MCEL, and PC/MCEL+NaOH indicate that the principle degradation mechanism of PC in DS2 is the chain cleavage reaction taking place at the carbonate linkage due to the attack of the amine and the hydroxide. Mass spectroscopy analysis on the dry PC/DS2 residue indicates that numerous low molecular weight products are formed. Results of stress cracking of PC with DS2 and DETA show a considerable breakdown in resistance. The MCEL component is less aggressive than DETA, but still induces significant stress cracking. Keywords: Polycarbonates, Stress cracking, Chemical degradation, Decontaminants, Fourier transform infrared.

Descriptors :   *CHEMICAL ATTACK(DEGRADATION), *DECONTAMINATION MATERIALS, *POLYCARBONATES, *CRACKING(FRACTURING), AMINES, CARBONATES, CHAIN REACTIONS, CLEAVAGE, CRACKS, DEGRADATION, LIGHTWEIGHT, LINKAGES, LOSSES, MASS SPECTROSCOPY, MEASUREMENT, MOLECULAR WEIGHT, PHYSICAL PROPERTIES, STRESSES, WEIGHT REDUCTION, FOURIER SPECTROSCOPY, INFRARED SPECTROSCOPY, SODIUM HYDROXIDE

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE