An assessement of the miscibility of binary elastomer systems. Part II. Application of the conductometric method
The object of investigations have been Polish-made poly(butylene terephthalate-co-oligooxybutylene terephthalate)s — Elitel 4440 and Elitel 4450 — differing in the content of soft oligooxybutylene segments (40% in Elitel 4440 and 50%. in Elitel 4450). These products have been modified either chemically (curing with small .amounts, of pentaerythritol or physically (annealing in argon for 70 hours at temperatures in the range of 110—160° C or blending with 10—30% of an urethane elastomer) The effect of modification or. the fundamental mechanical properties of crosslinked copolyestercthers and of their blends with urethane elastomer, namely breaking stress, hardness, permanent deformation at compression, rebound elasticity, brittle-point temperature, relative damping, energy taken over during compression. These Elitel elastomers are characterized by a too high permanent deformation from the point of their application in the manufacture of articles subjected to high, changing loads (e.g. as rings for railway bumpers). Only annealing of Elitels improves their dimensional stability. The optimal temperature of annealing is 120° C.
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