{TAIL ~ Another example} is condensation polymers having covalently bonded as repeating units in the polymer chain, aromatic tetracarbonylbisimide groups of {HEAD ~ the formula II} and III 
{ TAIL ~ Another example } is condensation polymers having covalently bonded as repeating units in the polymer chain , aromatic tetracarbonylbisimide groups of { HEAD ~ the formula II } and III
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