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Linear high molecular weight aromatic polyformals are readily obtained from biphenols and excess methylene chloride with solid sodium hydroxide or potassium hydroxide in the presence of a phase transfer catalyst or an aprotic dipolar solvent. By control of the stoichiometry bifunctional oligomers can be obtained which can subsequently be incorporated into a variety of block copolymers.
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Hay et al. (1984) studied this question.
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