ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
Small-angle scattering of neutrons (SANS) has been applied to investigate the equilibrium properties of polymer blends, in particular the critical fluctuations in the homogeneous regions for d-PS/PS, PS/d-PB and d-PS/PVME. The transition between mean-field and Ising behaviours has been observed for PS/d-PB about 6 K above Tc. The non-equlibrium behaviour of the SANS structure factor of d-PS/PS has been studied after a temperature step has been applied. Only for very small scattering vectors does the time-dependent structure factor follow the predictions of the Cahn–Hilliard theory. Also, early stages of decomposition within the miscibility gap have been studied in this system and in d-PS/PVME. [PS = polystyrene; PB = polybutadiene; PVME = poly(vinyl methyl ether).]
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889890013073
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