Hz. Ma et Lx. Zhang, EFFECT OF SIDE-GROUP ON MEAN-SQUARE RADIUS OF GYRATION OF ATACTIC POLY(METHYL METHACRYLATE) CHAIN, Polymer Journal, 29(12), 1997, pp. 1012-1015
Taking account of the effect of the large side group, the expression o
f the unperturbed mean-square radius of gyration, [S-2], is improved f
rom the Lagrange relation. Using the derived relation, the ratio curve
, [S-2]/x vs. the logarithm of degree of polymerization x for the atac
tic poly(methyl methacrylate) (A-PMMA) chain, gives a small bump, whic
h agrees better with experiment data. The characteristic ratio [S-2]/2
xl(2) and the temperature coefficient dIn[S-2]/d T dependence on the s
tereoirregularity are also investigated by the derived formula.