| http://www.w3.org/ns/prov#value | - Mention is in particular made, among these polymers, of those for which the molecular mass is between 200,000 and 1,000,000, advantageously polyethers. [0063] Mention is also made of polymers which can be calcined according to the usual methods. [0064] The calcinable polymers correspond to the polymers which are soluble in the solvents mentioned above and can also be chosen from polymers with a de
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