Polyesters weathering tests

Weathering tests, 245 Wholly aromatic liquid crystalline polyesters, degradation of, 38 Wholly aromatic polyamides, 136-137, 139 synthesis of, 184-189 Wholly aromatic polyesters, 25-26, 32 copolymerization and, 35 synthesis of, 71-72... 

Since the effect of temperature varies with type of polymer aud its formulations, temperatures different than those encountered in end-use environments can distort the stability rankings of materials in addition to causing unrealistic aging behavior. For example, it was shown [141] that change in air temperature from 30 to 60°C in an artilicial weathering test changed the rank order of the stabilities of polyamide, polypropylene, and polyester yam based on reduction... 

D Bauer, J Peck, R Carter III. Evaluation of accelerated weathering tests for a polyester-urethane coating using photoacoustic infrared spectroscopy. J Coatings Technology 59 103-107, 1987. 

Polyester polyols, 25 464 468 Polyester resin(s), 11 302 coating resins, 7 104-106 cyclopentadiene and dicyclopentadiene applications, 8 230 flammability of, 20 115-116 properties in powder coating, 7 43t standard test methods for, 20 11 It unreinforced, 10 187t weathering of, 20 116 Polyester resin-based powder coatings, organic titanium compounds in, 25 125 Polyester resin composites, 26 762-763 Polyester resin formulations ingredients of, 20 96t unsaturated, 15 511-512 Polyesters, 10 185-189, 497 12 655-656. See also Thermoplastic polyesters Unsaturated polyesters acid resistance of, 20 7-8 antioxidant applications, 3 121 aromatic ionic, 23 722 based on 1,4-cyclohexanedimethanol, 12 674-675... 

Limited testing has been carried out on the influence of weathering on the impact strength of polyester laminates containing both CSM and WR reinforcement. The results suggest that impact strength in temperate climates is unaffected over time, though in... 

We surveyed and screened a number of candidate glazing matmals (5,6), which include a varirty of polyesters, fluoropolymers, and polycarbonates (PC), as well as acryhc, polyetherinride, poly ylene (PE), polystyrene, and polyvinyl chloride. Bas on accelerated screaiing tests, we find that fluoropolymers and acrylic arc UV weatherable, and all other materials tested lose transmittance and yellow. However, fluoropolymers are relatively expensive and realistically would be limited to use as thin-film glazings. Acryhc tends to be too brittle and exhibits thomal sag as a glazing candidate for solar collector apphcations. 

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