Accession Number : AD0686791

Title :   STUDIES ON AMYLOSE AND ITS DERIVATIVES. PART VII. MELTING AND GLASS TRANSITION TEMPERATURES OF AMYLOSE ESTERS,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY

Personal Author(s) : Cowie,J. M. G. ; Toporwski,P. M. ; Costaschuk,F.

Report Date : 25 JUN 1968

Pagination or Media Count : 8

Abstract : Various amylose esters ranging from the acetate to the caproate were prepared. Melting and glass transition temperatures were measured for each and it was observed that both Tm and Tg were depressed as the chain length of the substituted ester side chain was increased. By assuming this to be an internal plasticization process, estimates of Tm and Tg were obtained for the unsubstituted amylose molecule. An average value of (Tg/Tm) of 0.80 was calculated for these esters which would suggest that they are moderately rigid, unsymmetrical polymers. (Author)

Descriptors :   (*POLYSACCHARIDES, *PHASE STUDIES), TRANSITION TEMPERATURE, GLASS, ESTERS, MELTING, CANADA

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE