Abstract
AbstractThe major changes which occur in the DP distribution of cellulose in wood pulp owing to the refining of unbleached stocks to produce several types of finished pulp have been examined by GPC. Represented in this study are sulfite and sulfate pulping processes and paper and dissolving grade pulps. Factors which influence the definition by GPC of small differences in chain length among high DP pulps were considered. The high DP extremes of ten celluloses were compared by GPC after prefractionation by fractional precipitation. Results classify only small percentages above 3500 DP and then only in the highest average DP pulps examined. The cold alkali‐soluble fractions isolated from a high and low DP sulfite paper pulp and a prehydrolyzed sulfate pulp were compared by GPC and differences have been revealed which were not evident from viscometric DP measurements.
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