| Literature DB >> 25263766 |
Kui Zhong1, Qi Zhang1, Litao Tong1, Liya Liu1, Xianrong Zhou1, Sumei Zhou2.
Abstract
Molecular weight degradation effects of schizophyllan (SPG) under ultrasonic treatments were investigated in this study. The degradation product was treated by alcohol fractional precipitation technology, and the molecular weight and rheological properties of ultrasonic-treated SPG (USPG) fractions were evaluated. Average molecular weight of SPG decreased significantly after ultrasonic treatments, and degradation product had more narrow distribution of molecular weight. The molecular weight degradation kinetics of SPG is adequately described by a second-order reaction. USPG fractions with different molecular weight were obtained by fractional precipitation for final alcohol concentration fractions 0-40%, 40-60% and 60-80%, respectively. USPG fractions had near-Newtonian flow behaviors, and USPG₈₀% exhibited viscous responses over the entire accessible frequency range. Therefore, ultrasonic treatment is a viable modification technology for SPG and other polymer materials with high molecular weight.Entities:
Keywords: Molecular weight degradation; Rheological properties; Schizophyllan; Ultrasonic treatment
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Year: 2014 PMID： 25263766 DOI： 10.1016/j.ultsonch.2014.09.008
Source DB: PubMed Journal: Ultrason Sonochem ISSN： 1350-4177 Impact factor: 7.491