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Title: Effect of A high explosive environment on polycarbonate degradation

Abstract

In the presence of high explosives such as 1, 3, 5, 7-tetranitro-1, 3, 5, 7-tetraazacyclooctane (HMX) and penaerythritol tetranitrate (PETN) at moderate temperature (70/sup 0/C), poly(oxycarbonyloxy-1, 4,-phenylene isopropylidene- 1, 4 phenylene), commonly known as Lexan polycarbonate, degradation is accelerated. Degradation acceleration is indicated by a reduction in glass transition temperatures of from 8 to 12/sup 0/C and a decrease in viscosity average molecular weight of polycarbonate samples aged in direct contact with these explosives as compared to polycarbonate kept at 32/sup 0/C in the absence of high explosives. Three major degradation mechanisms are involved: (1) chain scission; (2) crosslinking; and (3) intrachain rearrangement. Yellow polymer degradation products similar to those found in polycarbonate photo and high energy radiation degradation products intensify as the high explosive - polymer interface is approached. This implies that active species from the explosive thermal decomposition are responsible for acceleration of the chemical degradation of the polycarbonate. The physical properties of polycarbonate annealed below its glass transition temperature change gradually. A clustering phenomena has been proposed to explain the observed decrease in impact resistance and increase in strength of annealed polycarbonates. Although polycarbonate in the high explosive environment became brittle, we were unable to conclusively demonstratemore » any clustering phenomena in these polycarbonate other than that due to highly crosslinked degradation products.« less

Authors:
;
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore Lab.
OSTI Identifier:
6064791
Report Number(s):
UCRL-82627; CONF-790632-8
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: JOWOG-28, Albuquerque, NM, USA, 11 Jun 1979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHEMICAL EXPLOSIVES; CHEMICAL REACTIONS; POLYCARBONATES; DECOMPOSITION; POLYMERS; CROSS-LINKING; PETN; PHYSICAL PROPERTIES; CARBON COMPOUNDS; CARBONATES; ESTERS; EXPLOSIVES; NITRATES; NITRIC ACID ESTERS; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; POLYMERIZATION; 360405* - Materials- Polymers & Plastics- Degradation & Erosion- (-1987); 400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)

Citation Formats

Alhouse, L P, and Hoffman, D M. Effect of A high explosive environment on polycarbonate degradation. United States: N. p., 1979. Web.
Alhouse, L P, & Hoffman, D M. Effect of A high explosive environment on polycarbonate degradation. United States.
Alhouse, L P, and Hoffman, D M. Sun . "Effect of A high explosive environment on polycarbonate degradation". United States.
@article{osti_6064791,
title = {Effect of A high explosive environment on polycarbonate degradation},
author = {Alhouse, L P and Hoffman, D M},
abstractNote = {In the presence of high explosives such as 1, 3, 5, 7-tetranitro-1, 3, 5, 7-tetraazacyclooctane (HMX) and penaerythritol tetranitrate (PETN) at moderate temperature (70/sup 0/C), poly(oxycarbonyloxy-1, 4,-phenylene isopropylidene- 1, 4 phenylene), commonly known as Lexan polycarbonate, degradation is accelerated. Degradation acceleration is indicated by a reduction in glass transition temperatures of from 8 to 12/sup 0/C and a decrease in viscosity average molecular weight of polycarbonate samples aged in direct contact with these explosives as compared to polycarbonate kept at 32/sup 0/C in the absence of high explosives. Three major degradation mechanisms are involved: (1) chain scission; (2) crosslinking; and (3) intrachain rearrangement. Yellow polymer degradation products similar to those found in polycarbonate photo and high energy radiation degradation products intensify as the high explosive - polymer interface is approached. This implies that active species from the explosive thermal decomposition are responsible for acceleration of the chemical degradation of the polycarbonate. The physical properties of polycarbonate annealed below its glass transition temperature change gradually. A clustering phenomena has been proposed to explain the observed decrease in impact resistance and increase in strength of annealed polycarbonates. Although polycarbonate in the high explosive environment became brittle, we were unable to conclusively demonstrate any clustering phenomena in these polycarbonate other than that due to highly crosslinked degradation products.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {4}
}

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