GELATION OF CHEMICALLY CROSS-LINKED POLYGALACTURONIC ACID-DERIVATIVES

被引：35

作者：

MATRICARDI, P ^{[1
]}

DENTINI, M ^{[1
]}

CRESCENZI, V ^{[1
]}

ROSSMURPHY, SB ^{[1
]}

机构：

[1] UNIV ROMA LA SAPIENZA,DEPT CHEM,I-00185 ROME,ITALY

来源：

CARBOHYDRATE POLYMERS | 1995年 / 27卷 / 03期

关键词：

D O I：

10.1016/0144-8617(95)00055-C

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

We have previously developed a process for the cross-linking of glycuronans (tetrabutylammonium, TEA, salt form) with dialkyl or dialkylaryl halides. In the present work we have investigated the effect of such cross-linkers, including 1,6-dibromohexane (DBH), 1,3-diiodopropane and 1,10-diiododecane on TBA polygalacturonic acid (PGA). In particular, we have employed PGA/DBH at low stoichiometric amounts (R) of DBH so that the cross-linking reaction reaches an equilibrium conversion either just above or below the gel point conversion. At R = 0.084 a clear power law region is seen in both shear dynamic moduli G' and G '', and with frequency exponents of 0.657 for G '' and 0.640 for G' (both +/- 0.004), a condition which has been associated with the gel point. We have also investigated the effect of the other cross-linking agents to assess the significance of different halogenic and chain length effects.

引用

页码：215 / 220

页数：6

共 25 条

[1] EVOLUTION OF STRUCTURE AND VISCOELASTICITY IN AN EPOXY NEAR THE SOL-GEL TRANSITION [J].