LANGMUIR-BLODGETT-FILMS OF SUBSTITUTED CELLULOSE ACETOMYRISTATE - FABRICATION AND X-RAY-DIFFRACTION STUDY

The behaviour of the monolayer of cellulose triester of myristic and acetic acids on a water surface has been studied. The surface pressure-area (pi-A) isotherm curves of the monolayer of triester had a plateau region. The cyclic pi-A curve measurements, i.e. the cycles of compression and successive expansion of the monolayer, showed that the structural change in the monolayer under compression was nonreversible. The multilayers prepared by Langmuir-Schaefer method at different surface pressure provided X-ray diffraction patterns, which suggested that they had a Y-type packing. Studies of the relationship between the structure of the Langmuir-Blodgett films and the surface pressure for film deposition revealed that a change in the orientation of cellulose triester molecules was caused by compression of the monolayer.