ased on the probing technique of laser light scattering and the principle of the determination for the inhomogeneity of spatial distribution of polymer network by means of non-random index NRI(=(Rvv(0))nr/(Rvv(0))r -1)

the inhomogeneity of a important functional cross-linking polymer

which is the copolymer of styrene with divinylbenzene

has been characterized successfully.Here subscripts nr

r denote nonrandom

random cross-linking network

respectively.And the former is from the experiments

the latter is from calculation. Futhermore

both have to be done in equilibrium swelling condition. Rvv(0) represents the Rayleigh ratio at zero angle under vertical both polarizer and analyser. The samller the NRI

the better the mechanical properties. As a result

a low NRI could be as a criterion for superior mechanical performance of frame of functional cross-linking copolymer.