A study of the molecular interactions occurring in blends of cellulose esters and phenolic polymers

摘要

Relaxation and spin diffusion measurements were performed on a series of blends containing cellulose esters and phenolic polymers such as poly(vinyl phenol) (PVP) and Novolac resins. These experiments were used to determine the extent of molecular-level mixing between the cellulose esters and phenolic polymers. Changes in the peak positions of the phenolic hydroxyl carbon of PVP or Novolac and the carbonyl peak of the cellulose ester were used to study the formation of hydrogen bonds between the two different polymers. ~(13)C CP/MAS and ~1H CRAMPS NMR spectroscopy was used to measure the degree of polymer mixing on the molecular scale. Blends of cellulose acetate and phenolic polymers were determined to be mixed on the molecular level. ~(13)C CP/MAS NMR spectroscopy suggested that in the case of cellulose acetate butyrate/phenolic polymers blends that one (or more) butyryl side group attached to a specific position along the anhydroglucose ring was more efficient at forming hydrogen bonds with the phenolic polymers.