SOLVENT DEGRADATION OF GLASS-REINFORCED VECTRA

Authors
  1. Connor, C.
  2. Kelly, C.G.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Liquid crystal polymers, such as Vectra, have a number of desirable characteristics, including high strength and stiffness, easy processability, and excellent solvent resistance. However, most commercial grades of Vectra are reinforced with either glass or carbon fiber. The fiber-resin interface may provide a route for chemical attack in these fiber-reinforced materials. To determine if the fibers reduced the solvent resistance of Vectra, coupons of 30% glass-fiber reinforced Vectra were immersed in a variety of common solvents and reagents for time periods ranging up to 1400 hours. Significant weight changes were observed only in those samples immersed in sodium hydroxide and ammonium hydroxide. The degradation proceeded much more rapidly at 72C than at room temperature. Infrared and nuclear magnetic resonance spectroscopy show that breakdown of the polymer occurs by chain scission, resulting from base attack at the carbonyl group. This work indicates that glass-fiber reinforced Vectra is resistant to most common solvents and reagents, with the exception of strong bases.
Keywords
VECTRA
Report Number
DREP-TM-93-30 — Technical Memorandum
Date of publication
01 Apr 1993
Number of Pages
18
DSTKIM No
94-02791
CANDIS No
134226
Format(s):
Hardcopy;Originator's fiche received by DSIS

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