The effect of structure and constituent of side groups on unperturbed dimension and polarity is investigated for typical vinyl-polymers

including poly(methyl vinyl ketone)s (PVMK)

poly(tert-butyl vinyl ketone) (PTBVK)

poly(itaconate) (PI) and 1

2-polybutadiene(1

2-PBD) with various large substituents.Based the unified expressions of primary quantities deduced by an improved method of configurational- conformational statistics

the characteristic ratios of mean-square radius of gyration of atactic PVMK

PI

PTBVK and 1

2-PBD are obtained to be 3.09

2.96

1.72 and 1.11

respectively

and the characteristic ratios of mean-square dipole moments of atactic PI

PVMK and PTBVK are 1.57

0.79 and 0.45

respectively.From comparing the intrinsic viscosity

the characteristic ratios

the temperature coefficient and the differential values of conformational energies

it is found that the dependence of physical properties of PVMK on the configuration and chain length is changeable obviously.From contrasting the characteristic curves of PI and PTBVK

it is observed that there are quite characteristic differences between mean-square dipole moment and mean-square radius of gyration

the difference of their differential values of energies for PTBVK chain is reached to 20.1210-2 mol/J for instance.However

the characteristic curves of PI and 1

2-PBD are smooth relatively

it is explained that their side groups

even with different structures

have similar physical effects.Therefore

it suggests that the comparative study of chain feature based on the relevant structure model of side groups is necessary.