Cable jacket aging study: comparison of polyether and polyester urethane materials

• Main Author: Jones, L.H.
• Format: Report
• Language: English
• Published: Sandia National Laboratories 1978
• Subjects: 360304 > Composite Materials > Physical Properties > (-1987); Electrical Insulation; Organic Compounds; Organic Polymers; Testing 360303* > Composite Materials > Mechanical Properties > (-1987); Fabrication; Bonding; Hardness; Tensile Properties; 42 Engineering; Polymers; High Temperature; Materials Testing; Urethane; Joining; Polyesters; Carboxylic Acid Salts; Mechanical Properties; Esters; 420500 > Engineering > Materials Testing; Weight; Aging; Carbonic Acid Derivatives; 36 Materials Science; Organic Nitrogen Compounds; Carbamates; Carbonic acid
• Online Access: https://doi.org/10.2172/5211855; https://digital.library.unt.edu/ark:/67531/metadc1052843/

Accelerated aging experiments for up to 310 days duration were carried out on three polyester and three polyether urethane materials. The aging environments selected were (1) oven aging up to 100/sup 0/C, (2) water immersion up to 70/sup 0/C, (3) various combinations of relative humidity and temperature up to 100% R.H. and 50/sup 0/C, and (4) 0.48% (by volume) NO/sub 2/ in air. The sample properties followed included (1) physical dimensions, (2) hardness, (3) weight, (4) ultimate elongation, (5) ultimate tensile strength, (6) 300% tensile modulus, and (7) adhesive bond strengths. Dimensional and hardness measurements were not sensitive to sample degradation. Weight changes and the three tensile properties were more useful in following the degradation process. The results indicated that the polyesters are superior in both elevated temperature and NO/sub 2/ service; the polyethers are superior in water immersion and humid environments. Deterioration of the adhesive bond strength in the polyesters was more severe under humidity cycling.