This paper describes the use of specific thermoplastic polyurethane elastomers (TPU) in blends with poly(vinyl butyral) (PVB). This work was directed towards the development of an interlayer having improved impact resistance and less sensitivity to variations in impact resistance over the useful temperature range. A family of commercially available cycloaliphatic polyether TPUs was found which produced optically clear, mechanically and thermodynamically miscible blends with PVB. The concept of a miscibility parameter was used to rationalize the compatibility of these blends. Support for compatibility is given by Tg, d.s.c, and d.m.a, data. The Gordon-Taylor relationship has been extended from use as a predictive tool for estimating the Tg of blends to estimating the physical properties of blends. Good agreement between tensile, tear and the measured values was obtained. Impact data on laminates using PVB/TPU (60/40) lightly plasticized (7%) with a glycol ether show almost complete lack of temperature sensitivity.
Посилання на статтю:
Miscibility and properties of poly(vinyl butyral) and thermoplastic polyurethane blends / T. F. Sincock and D. J. David // Polymer. – 1992. – Vol 33. – P. 4515-4521.