A study of the weathering of an elastomeric polyurethane

Abstract

article describes detailed weather-resistance T :

Urethane Coatings

“…The combination of varied chemical types of polymeric networks in different compositions, often resulting in controlled different morphologies, has produced IPNs with synergistic behavior. For example, if one polymer is glassy and the other is elastomeric at room temperature, one obtains either a reinforced rubber or a high-impact plastic depending on which phase is continuous (14). In the case of more complete phase mixing, enhancement in numerous mechanical properties is due to the increased physical cross-link density due to this interpénétration.…”

Modified precipitated silicas as polyurethane fillers

“…This permits the inclusion of the polymers into cathegory of self-reinforcing ones [1,2]. Even in the absence of fillers they exhibit high tensile strength and tearing strength.…”

Effect of crystallinity and flexibility on the photodegradation of polyurethanes

“…This, of course, severely limits their use in situations which require even moderate exposure to sunlight. As a consequence, considerable attention has been given over the past two decades to the study of the photodegradation process of aromatic diisocyanate based polyurethanes (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14).…”

“…In pioneering investigations of the photodegradation of MDI and TDI based polyurethanes, Schollenberger and coworkers (4)(5)(6)(7) and Nevskii, Tarakanov, and coworkers (8)(9)(10)(11)(12) both postulated the formation of mono-and diquinone imide products (Scheme I).…”