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Characterization of spherical microlatex particles made of linear uncrosslinked polystyrene chains
Author(s) -
Gao Jun,
Zhou Shuiqin,
Wu Chi
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10698
Subject(s) - characterization (materials science) , materials science , polystyrene , composite material , nanotechnology , polymer
Laser light scattering (LLS), including both angular dependence of the absolute scattering intensity (static LLS) and of the line‐width distribution G(Γ) (dynamic LLS), were used to characterize two kinds of pauci‐chain polystyrene (PCPS) microlatices (latex‐1 and latex‐2). Each PCPS particle contains only a few linear uncrosslinked polystyrene chains. In static LLS, the weight‐average particle molar mass ( M w ) was measured; and simulataneously in dynamic LLS, the diffusion coefficient distribution was obtained from Laplace inversion of precisely measured intensity‐intensity time correlation function. Our results reveal that, on average, latex‐1 and latex‐2 contain ∼13 and ∼7 linear polystyrene chains, resp. A combination of both static and dynamic LLS results enables us to calculate the average density of PCPS. Our results have also shown that the particle density of latex‐1 and latex‐2 are 0.90 and 0.80 g/cm 3 , respectively, which are lower than the density of conventional polystyrene latex particles or bulk polystyrene. Our results imply that the particle density decreases as the average number of polystyrene chains inside the particles decreases.