Model of packing of cellulose acetomyristinate in Langmuir-Blodgett films

The variation of the structural characteristics in the transition from a bl ock polymer to a Langmuir-Blodgett film has been investigated for cellulose acetomyristinate by the methods of X-ray diffraction analysis. The effect of length and number of acid residues on the diffraction pattern of block c ellulose acetomyristinate is studied. The role of acyl substituent in the f ormation of an ordered structure of multilayer Langmuir-Blodgett films is e stablished. A model of packing of cellulose acetomyristinate molecules in t he Y-type films is suggested. The model is based on a two-domain structure in which close-packed myristic-acid residues are located either normally or at a certain angle to the plane of glucoside rings on one side of the poly mer chain. (C) 2000 MAIK "Nauka/Interperiodica".