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Rheological properties of compatible polymer blends.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Rheological properties of compatible polymer blends./
Author:	Yang, Heng-Huey.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1988,
Description:	153 p.
Notes:	Source: Dissertations Abstracts International, Volume: 50-07, Section: B.
Contained By:	Dissertations Abstracts International50-07B.
Subject:	Polymers. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8818579
ISBN:	9798206984798

Rheological properties of compatible polymer blends.
Yang, Heng-Huey.

Rheological properties of compatible polymer blends. - Ann Arbor : ProQuest Dissertations & Theses, 1988 - 153 p.

Source: Dissertations Abstracts International, Volume: 50-07, Section: B.

Thesis (Ph.D.)--Polytechnic University, 1988.

This item must not be sold to any third party vendors.

The effect of temperature, blend composition, and chemical structure on the viscoelastic properties of compatible polymer blends was studied. Both the steady shear flow properties (namely, viscosity $\\eta$ and first normal stress difference N$\\sb1$) and oscillatory shear flow properties (namely, dynamic storage modulus G$\\sp\\prime$ and dynamic loss modulus G$\\sp{\\prime\\prime}$) were measured for three different compatible blend systems, i.e., poly(styrene-co-acrylonitrile) (SAN)/poly($\\varepsilon$-caprolactone) (PCL), SAN/poly(methyl methacrylate) (PMMA), and poly(vinylidene fluoride) (PVDF)/PMMA blends. The dependence of the zero-shear viscosity $\\eta\\sb\\circ$ of the blends on blend composition and chemical structure was analyzed based on the free volume and entanglement concepts. The miscibility of the melt-blended samples was confirmed by the transparency of the blend samples and by the existence of a single glass transition temperature (T$\\sb{\\rm g}$) for the blends. In addition, the phase diagrams of the blends studied were obtained using a light scattering technique. In one-phase region of the phase diagram, plots of log $\\eta\\sb\\circ$ versus blend composition show either positive or negative deviations from linearity, depending upon the blend system investigated. For blends in one-phase region, plots of log G$\\sp\\prime$ versus log G$\\sp{\\prime\\prime}$ and log N$\\sb1$ versus log $\\sigma\\sb $ give rise to correlation which becomes virtually independent of temperature. The slope of log G$\\sp\\prime$-log G$\\sp{\\prime\\prime}$ and log N$\\sb1$-log $\\sigma\\sb $ plots was found to be less than 2, as observed for polydisperse homopolymers. The temperature dependence of shift factor a$\\sb{\\rm T}$ follows the Arrhenius relationship at temperatures well above the T$\\sb{\\rm g}$ of the blends whereas the Williams-Landel-Ferry (WLF) equation is obeyed at temperatures lower than T$\\sb{\\rm g}$ + 100$\\sp\\circ$C. Moreover, plots of G$\\sbsp{\\rm N}{\\circ}$ versus volume fraction of the blend show negative deviations from linearity. In one-phase region, frequency-temperature superposition principle is found to be applicable to the three compatible blend systems investigated, suggesting that they are thermorheologically simple systems.

ISBN: 9798206984798Subjects--Topical Terms:

535398
Polymers.

Rheological properties of compatible polymer blends.
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020 $a 9798206984798
035 $a (MiAaPQ)AAI8818579
035 $a AAI8818579
040 $a MiAaPQ $c MiAaPQ
100 1 $a Yang, Heng-Huey. $3 3687484
245 1 0 $a Rheological properties of compatible polymer blends.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1988
300 $a 153 p.
500 $a Source: Dissertations Abstracts International, Volume: 50-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Han, Chang Dae.
502 $a Thesis (Ph.D.)--Polytechnic University, 1988.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The effect of temperature, blend composition, and chemical structure on the viscoelastic properties of compatible polymer blends was studied. Both the steady shear flow properties (namely, viscosity $\\eta$ and first normal stress difference N$\\sb1$) and oscillatory shear flow properties (namely, dynamic storage modulus G$\\sp\\prime$ and dynamic loss modulus G$\\sp{\\prime\\prime}$) were measured for three different compatible blend systems, i.e., poly(styrene-co-acrylonitrile) (SAN)/poly($\\varepsilon$-caprolactone) (PCL), SAN/poly(methyl methacrylate) (PMMA), and poly(vinylidene fluoride) (PVDF)/PMMA blends. The dependence of the zero-shear viscosity $\\eta\\sb\\circ$ of the blends on blend composition and chemical structure was analyzed based on the free volume and entanglement concepts. The miscibility of the melt-blended samples was confirmed by the transparency of the blend samples and by the existence of a single glass transition temperature (T$\\sb{\\rm g}$) for the blends. In addition, the phase diagrams of the blends studied were obtained using a light scattering technique. In one-phase region of the phase diagram, plots of log $\\eta\\sb\\circ$ versus blend composition show either positive or negative deviations from linearity, depending upon the blend system investigated. For blends in one-phase region, plots of log G$\\sp\\prime$ versus log G$\\sp{\\prime\\prime}$ and log N$\\sb1$ versus log $\\sigma\\sb $ give rise to correlation which becomes virtually independent of temperature. The slope of log G$\\sp\\prime$-log G$\\sp{\\prime\\prime}$ and log N$\\sb1$-log $\\sigma\\sb $ plots was found to be less than 2, as observed for polydisperse homopolymers. The temperature dependence of shift factor a$\\sb{\\rm T}$ follows the Arrhenius relationship at temperatures well above the T$\\sb{\\rm g}$ of the blends whereas the Williams-Landel-Ferry (WLF) equation is obeyed at temperatures lower than T$\\sb{\\rm g}$ + 100$\\sp\\circ$C. Moreover, plots of G$\\sbsp{\\rm N}{\\circ}$ versus volume fraction of the blend show negative deviations from linearity. In one-phase region, frequency-temperature superposition principle is found to be applicable to the three compatible blend systems investigated, suggesting that they are thermorheologically simple systems.
590 $a School code: 0179.
650 4 $a Polymers. $3 535398
650 4 $a Chemical engineering. $3 560457
690 $a 0495
690 $a 0542
710 2 $a Polytechnic University. $3 1249856
773 0 $t Dissertations Abstracts International $g 50-07B.
790 $a 0179
791 $a Ph.D.
792 $a 1988
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8818579