Polymeric perfluoroalkylether-linked quinoxalines

USH1668H · kind H · statutory invention registration

Assignee

• The United States of America as represented by the Secretary of the Air · US

Inventors

• Kazimiera J. L. Paciorek · Newport Beach, US
• Steven R. Masuda · Laguna Niguel, US
• Wen-Huey Lin · Laguna Niguel, US
• William M. Warner · Summerville, US

Key dates

• Grant date: Jul 1, 1997

Classification

• Technology area (CPC —): General

Abstract

Perfluoroalkylether-linked quinoxalines having repeating units of the formula: ##STR1## wherein R.sub.f is selected from the group consisting of --OCF.sub.2 CF.sub.2 --, --OCF.sub.2 CF.sub.2 CF.sub.2 --, --OCF.sub.2 CF.sub.2 CF.sub.2 CF.sub.2 --, --OCF.sub.2 CF(CF.sub.3)-- and --OCF.sub.2 CF.sub.2 OCF.sub.2 CF(CF.sub.3)--; wherein n has a value of 2 to 4, and m has a value of 1 to 20; and wherein R is a single bond, --O--, --S--, --C.sub.6 H.sub.4 --O--C.sub.6 H.sub.4 --, or --SO.sub.2 --, are prepared by the steps ofPA1 (a) preparing a perfluoroalkylether diiodide of the formula I(CF.sub.2).sub.n (R.sub.f).sub.m (CF.sub.2).sub.n l;PA1 (b) reacting the perfluoroalkylether diiodide with 4-iodobenzil to produce the tetraketone C.sub.6 H.sub.5 C(O)C(O)C.sub.6 H.sub.4 (CF.sub.2).sub.n (R.sub.f).sub.m (CF.sub.2).sub.n C.sub.6 H.sub.4 C(O)C(O)C.sub.6 H.sub.5 ; andPA1 (c) reacting the resulting tetraketone with a tetraamine of the formula ##STR2## wherein R is a single bond, --O--, --S--, --C.sub.6 H.sub.4 O--C.sub.6 H.sub.4 --, or --SO.sub.2 --. The perfluoroalkylether-linked quinoxalines can be end-capped with, for example, a low proportion of co-monomers having crosslinking sites such …