A small-angle X-ray scattering (SAXS) study of a model copolymer latex
, composed of styrene and pentabromobenzyl acrylate (PBBA, 40 wt %), i
s presented. The contrast variation method employed in this study was
shown to be a sensitive probe for inhomogeneity in the particles. The
separation of the homogeneous function allows direct calculation of th
e size distribution of the spherical particles (volume average diamete
r, 26.7 +/- 1.3 nm). The SAXS analysis reveals a particle's inner stru
cture described as a continuos copolymer phase, of composition being s
lightly richer in PBBA, within which domains of polystyrene are random
ly distributed. The volume fraction of the polystyrene domains was est
imated as 11 vol % and their characteristic length as 5.1 nm.