2010 Volume 39 Issue 4 Pages 422-423
High-molecular-weight o-cresol resins with narrow-molecular-weight distribution were prepared using a phase-separation reaction system. The prepared o-cresol resins included a trace of monomer, so that the molecular-weight distribution was narrow. In high molecular weight o-cresol resin, the fractions of ortho–ortho′, ortho–para′, and para–para′ methylene linkages were close to 25%, 50%, and 25%, respectively. This indicated that the reactivity of the ortho position was equal to that of the para position. It was found that the o-cresol ring was highly activated in phase separation reaction system using H2SO4/acetic acid.
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