ISSN:
0887-6266
Keywords:
small-angle neutron scattering
;
SANS
;
polystyrene
;
polyvinylmethylether
;
radius of gyration
;
Zimm analysis
;
random phase approximation
;
phase diagram
;
polymer blends
;
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Small-angle neutron scattering was used to measure the radius of gyration and thermodynamics of blends of poly(vinylmethylether) (PVME) at dilute concentration in deuterated polystyrene (PSD). The data were analyzed using the Zimm equation and the random phase approximation theory. For PVME with a weight-average molecular weight of 38,400 the value of the radius of gyration, Rg, was found to be 47 Å in the limit of the concentration of PVME extrapolated to zero. Analysis of the temperature dependence of the Flory interaction parameter, χ/v0, indicates that phase separation should occur at approximately 300°C for a sample with φPVME ≅ 9%. No significant temperature dependence of Rg was found over the experimental range studied. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1-9, 1998
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
