| http://www.w3.org/ns/prov#value | - When the ladder polymer is a chain one, the polymer has, at the Si terminal, halogen such as Cl or the like, alkoxy having 1 to 6 carbon atoms, acetoxy or hydroxyl and at the O terminal, oxygen substituted with halogen, or alkyl having 1 to 6 carbon atoms, acetyl or hydrogen linked to oxygen in corresponding relationship with the Si terminal.
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