The effect of phase-separated morphology on the rheological properties of polystyrene/poly(vinyl methyl ether) blend
SCIE
SCOPUS
- Title
- The effect of phase-separated morphology on the rheological properties of polystyrene/poly(vinyl methyl ether) blend
- Authors
- Kim, JK; Son, HW; Lee, YB; Kim, JW
- Date Issued
- 1999-05-01
- Publisher
- JOHN WILEY & SONS INC
- Abstract
- The effect of phase-separated morphology on the rheological properties of polystyrene/poly(vinyl methyl ether) (PS/PVME) blend was investigated by optical microscopy (OM), light scattering (LS) method, and rheology. The blend had a lower critical solution temperature (LCST) of 112 degrees C obtained by turbidity experiment using LS at a heating rate of 1 degrees C/h. Three different blend compositions (critical 30/70 PS/PVME by weight) and two off-critical (50/50 and 19/90)) were prepared. The rheological properties of each composition were monitored with phase-separation time after a temperature jump from a homogeneous state to the preset phase-separation temperature. For the 30/70 and 50/50 blends, it was found that with phase-separation time, the storage and loss moduli (G' and G") increased at shorter times due to the formation of co-continuous structures resulting from spinodal decomposition. Under small oscillatory shearing, shear moduli gradually decreased with time at longer phase-separation times due to the alignment of co-continuous structures toward the flow direction, as verified by scanning electron microscopy. However, for the 10/90 PS/PVME blend, the rheological properties did not change with phase-separation times. (C) 1999 John Wiley & Sons, Inc.
- Keywords
- phase-separating morphology; rheologic properties; PS/PVME blends; POLY(VINYL METHYL-ETHER) BLENDS; COMPATIBLE POLYMER MIXTURES; VISCOELASTIC PROPERTIES; POLYVINYL METHYL-ETHER); MISCIBLE BLENDS; POLY(METHYL METHACRYLATE); BEHAVIOR; TEMPERATURE; SHEAR; MISCIBILITY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20446
- ISSN
- 0887-6266
- Article Type
- Article
- Citation
- JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, vol. 37, no. 9, page. 889 - 906, 1999-05-01
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