In:
Journal of Applied Polymer Science, Wiley, Vol. 116, No. 2 ( 2010-04-15), p. 1068-1076
Abstract:
The effects of nanoparticles and high‐pressure carbon dioxide (CO 2 ) on shear viscosity of polystyrene (PS) were studied. Master curves of PS, PS + 5 wt % carbon nanofibers (CNFs), and PS + 5 wt % nanoclay (Southern Clay 20A) without CO 2 were created based on parallel‐plate measurements. The results showed that addition of nanoparticles increased the viscosity of the neat polymer. Steady‐state shear viscosity of PS in the presence of CO 2 and nanoparticles was measured by a modified Couette rheometer. The effect of supercritical CO 2 on these systems was characterized by shift factors. It was found that under the same temperature and CO 2 pressure, CO 2 reduced the viscosity less for both PS‐20A and PS‐CNFs than neat PS. Between the two types of nanoparticles, CNFs showed a larger viscosity reduction than 20A, indicating a higher CO 2 affinity for CNFs than 20A. However, the advantage of CNFs over 20A for larger viscosity reduction decreased with higher temperature. A gravimetric method (magnetic suspension balance) was used to measure the excess adsorption of CO 2 onto CNFs and nanoclay, thus, CO 2 showed a higher affinity for CNFs. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
Type of Medium:
Online Resource
ISSN:
0021-8995
,
1097-4628
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
240694-9
detail.hit.zdb_id:
1491105-X
