The smoking salons of the Hindenburg and other hydrogen-filled dirigibles of the 1930s were insulated with urea
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The smoking salons of the Hindenburg and other hydrogen-filled dirigibles of the 1930s were insulated with urea formaldehyde polymer foams. The structure of this polymer is highly cross-linked, like that of Bakelite (Section 31 .5). Propose astructure.
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Нeat Нeat + CH20 NH2 H2N
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