[Calorimetric study of the fusion of the liquid-crystalline structure of poly-gamma-benzyl-L-glutamate solutions].
A calorimetric study has been carried out of the specific features of melting of liquid-crystalline structure in the system PBG--dioxan depending on the conditions of its formation on the one hand, and on destruction rate on the other. It has been found that an increase of the temperature of solution crystallization as well as an increase in crystallization time shifts the conformation transition to the region of high temperatures, the value of the temperature shift decreasing with the rise of multiplication of heating for all the concentrations studied. By means of kinetic studies a sharp increase of heat effect with the rise of the velocity of heating the system has been found. A change in the scanning rate does not displace the beginning of the conformation transition, while Tmax and Tult is increased with an increase of Vheat. The kinetic regularities obtained allowed to suggest the presence of two processes proceeding when the system studied is passing the interval of conformation transition--the melting processes and subsequent aggregation of PBG molecules. They allowed also to separate these two processes.
D001593:Benzyl Compounds; D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D004146:Dioxanes; D005971:Glutamates; D006358:Hot Temperature; D007700:Kinetics; D008968:Molecular Conformation; D011108:Polymers; D013997:Time Factors
D001593:Benzyl Compounds; D004146:Dioxanes; D005971:Glutamates; D011108:Polymers
Kalorimetricheskoe izuchenie plavleniia zhidkorkristallicheskoĭ struktury rastvorov poli-gamma-benzil-L-glutamate.