首页>
外文期刊>journal of chemical physics
>Configurational partition functions and entropies for polyoxide chains having the repeat unit lsqb;(CH2)yndash;Ondash;rsqb;
【24h】
Configurational partition functions and entropies for polyoxide chains having the repeat unit lsqb;(CH2)yndash;Ondash;rsqb;
展开▼
机译：Configurational partition functions and entropies for polyoxide chains having the repeat unit lsqb;(CH2)yndash;Ondash;rsqb;
Rotational isomeric state theory is used to calculate values of the configurational partition functionzand entropySfor polyoxide chains having the repeat unit lsqb;(CH2)yndash;Ondash;rsqb;. The values ofzare at least qualitatively useful in interpreting the effect of the numberyof methylene groups in the repeat unit on the characteristic ratio lang;r2rang;0/nl2of the unperturbed dimensions relative to the number of skeletal bonds and the average square of their lengths. For example,zhas a maximum (corresponding to maximum rsquo;rsquo;equilibrium flexibilityrsquo;rsquo; of the chain) aty=3, where lang;r2rang;0/nl2is at a minimum. The configurational entropyS, however, shows a very poor correlation with eitherzor lang;r2rang;0/nl2; similar difficulties have been noted in comparisons between some polypeptide chains, and between some polysaccharide chains.
展开▼
