[CH2:1]([CH:3]1[O:5][CH2:4]1)Cl.[CH2:6]1[O:8][CH2:7]1.C1OC1.[N-:12]=[N+:13]=[N-:14].[Na+].C1C(N)=NC(=O)N(CCOCCP(O)(O)=O)C=1.[OH-].[Na+]>CC(N(C)C)=O>[CH2:1]([N:12]=[N+:13]=[N-:14])[CH:3]1[O:5][CH2:4]1.[CH2:7]1[O:8][CH2:6]1Elastomeric GEC is prepared according to the same previous procedure as in Example 1, except that commercial rubbery Epichlorohydrin-Ethylene Oxide Copolymer (PEEC) is used instead of PECH as the starting material. The copolymer contains about 70% PECH and 30% Ethylene Oxide. For this reason, a weight ratio NaN3 :PEEC of 0.55 is used in this case. Specifically, the reaction for 16 h at 100° C. of 10 g PEEC (MW~9×105) in 50 g DMA and 5 g EG with 5.5 g NaN3 and 1.5 g NaOH will yield 9.0 g (90%) of GEC azido product. This copolymer containing about 70% GAP and 30% Ethylene Oxide has a MW of about 10,000, a Tg of about -55° C. and a functionality (f) of about 3.5.
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