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Segmented poly(ether urethanes) were synthesized from polypropylene glycol (PPG) and 4,4′‐methylene‐bis(phenyl‐isocyanate) (MDI), using 1,1′‐bis(β‐aminoethyl)ferrocene (BAF) and 1,1′‐bis(β‐hydroxyethyl)ferrocene (BHF) as chain extenders. These polymers were characterized by infrared and 13C‐NMR spectroscopy. Mass spectrometry was also utilized to determine the linkage of BAF and BHF in these polymers.
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Gonsalves et al. (1986) studied this question.
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