Hydrolytic degradation of polymeric insulation materials as measured by infrared absorption spectroscopy

摘要

AbstractThe hydrolytic degradation of certain polymeric insulation materials can be monitored by an infrared band–ratio spectroscopic method. These polymers, used in the precision electronic components of the aerospace industry, were a polyester (Mylar), a polyvinyl fluoride (Tedlar), and a polyimide (H–film). The polymer films were synthetically aged under selected conditions of temperature, moisture, and time. As ingrowth infrared bands appeared, assignments of the functional group bands of the degradation products were made. The band–ratio data gave a quantitative indication of the extent of degradation. The polyimide film showed the greatest resistance to hydrolysis, followed by the polyvinyl fluoride, and lastly, the poly