Effect of Hydrophobic Modification Methods on the Gelation and Agregation of O-Methyl Cellulose Conference Paper uri icon

abstract

  • Gelation of o-metylcellulose (MC) in aqueous solution is believed to be caused primarily by the hydrophobic interaction between molecules containing methoxyl substitution. Recently it has been shown that different aggregates such as micelles, vesicles, and'pearl-necklaces' are formed during different stages of the gelation process. In this paper we examine the effect of distribution on the gelation and aggregation processes. Two types of molecules have been used: the first with block-like amphiphilic structure and the second with a more homogeneous distribution of substituted hydrophobic group. The systems were examined by means of Small Angle X-ray Scattering, Speckle pattern analysis and rheology. Large differences exist between the two types of systems indicating that gelation is more readily accomplished in the case of highly heterogeneous substituent distribution. It was also …

publication date

  • January 1, 2001