Fractionation of methyl cellulose according to polarity -: a tool to differentiate first and second order heterogeneity of the substituent distribution

被引：18

作者：

Adden, Roland ^{[1
]}

Mueller, Romy ^{[1
]}

Mischnick, Petra ^{[1
]}

机构：

[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Lebensmittelchem, D-38106 Braunschweig, Germany

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2006年 / 207卷 / 11期

关键词：

DS-gradient; fractionation; heterogeneity of first and second order; methyl cellulose; substituent distribution;

D O I：

10.1002/macp.200600048

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A set of four MCs (DS 1.80-1.95) has been analyzed with regard to their substituent pattern in the glucosyl units and along the polymer chain. The average heterogeneity of methylation observed for the entire material was analyzed in more detail after fractionation according to polarity. All fractions obtained were analyzed with respect to their DS, monomer composition and deviation from a random distribution of these monomers in the polymer chains. By this approach, heterogeneity of first and second order could be differentiated. While for three of the MCs only a minor DS-gradient over the material was observed, a more pronounced heterogeneity of first order was obtained for MC 4.

引用

页码：954 / 965

页数：12

共 34 条

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