Block copolymers based on Poly (ester-ether) block were in part tested to SAE (Society of Automotive Engineers) J2027 as to their suitability for use in automotive fluid handling applications. Six block copolymers of varying microstructure (that is hard-soft segment ratio) were injection moulded into ASTM test specimens and immersed in five standard automotive test fluids; Aggressive Water, Fuel C, Transmission Oil, Ethylene Glycol, and Zinc Chloride solution. Deterioration in tensile strength, tensile and flexural, modulus of up to 15% for the block copolymers was observed after immersion in all test fluids except Fuel C where the reduction in mechanical properties was as high as 50% when compared to the neat dry polymers. Similar but less dramatic behaviour was also seen for the elongation at break measurements. The loss in impact strength on immersion in the test fluids was small, the greatest loss was seen for the softer grades of block copolymer. The degradation of mechanical properties is correlated with the ratios of hard to soft segments in the block copolymers studied.
Evaluation of poly (ester-ether) block copolymers for use in automotive fluid handling applications
Bewertung der Poly(ester-ether)-Blockcopolymere für den Einsatz in der Handhabung von Automobilflüssigkeiten
2002
5 Seiten, 4 Bilder, 4 Tabellen, 7 Quellen
Conference paper
English
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