Inorganic Coordination Polymers. XVIII. Observations on Brittle and Flexible Films of (Cr((OP(CH3)(C6H5)O)2)(OP((C8H17)2)O))x.
PENNWALT CORP KING OF PRUSSIA PA RESEARCH AND DEVELOPMENT DEPT
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Films of CrOPCH3C6H5O2OPC8H172Ox, formed during the reaction of CrOHOPCH3C6H5O2x with dioctylphosphinic acid, are either brittle or flexible depending on the details of the preparation of the chromiumIII bisphosphinate precursor. Both kinds of film appear to contain mainly triple-bridged chains. Differing degrees of randomness in distribution of the two kinds of phosphinate bridges and, hence, of the internally plasticizing octyl groups along the chain account for the observed differences in flexibility, X-ray diffraction patterns, and birefringence. The observed intrinsic viscosities of 9-18 dlg indicate that these trisphosphinates form microgels rather than true solutions. The thermal degradation of these films proceeds by the oxidation and cleavage of the organic side groups. Addition of antioxidants to the flexible films significantly increases the longevity of their flexibility at 200C.
- Polymer Chemistry