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Study on conformational transition phenomena of poly(methyl methacrylate) in acetonitrile near theta conditions

Study on conformational transition phenomena of poly(methyl methacrylate) in acetonitrile near... The coil–globule transition for poly(methyl methacrylate) (PMMA) has been studied in a theta solvent, acetonitrile (Θ = 45 °C). The viscosity of PMMA was measured as a function of temperature in the range 26–55 °C. The contraction and expansion of the molecular chains are determined using the measured viscosity values. The temperature dependence of the intrinsic viscosity can be represented by a master curve in a $\alpha_{\eta}^{3} |\tau | M^{1/2}_{w} \ (\hbox{g}^{1/2}\,\hbox{mol}^{-1/2})$ versus |τ|M w1/2 (g1/2 mol−1/2) plot, where τ = |T − Θ|/T is the reduced temperature and Mw‐is the weight‐average molecular weight. A universal plot of reduced viscosity versus reduced blob parameter (N/Nc) shows the attainment of the collapsed state below the theta temperature. The dimensions of PMMA in acetonitrile (Mw = 3.15 × 106 g mol−1) decrease to 63 % at 26 °C of those in the unperturbed state. The results in this work are compared with those previously published. © 2000 Society of Chemical Industry http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer International Wiley

Study on conformational transition phenomena of poly(methyl methacrylate) in acetonitrile near theta conditions

Polymer International , Volume 49 (12) – Dec 1, 2000

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Publisher
Wiley
Copyright
Copyright © 2000 Society of Chemical Industry
ISSN
0959-8103
eISSN
1097-0126
DOI
10.1002/1097-0126(200012)49:12<1648::AID-PI578>3.0.CO;2-N
Publisher site
See Article on Publisher Site

Abstract

The coil–globule transition for poly(methyl methacrylate) (PMMA) has been studied in a theta solvent, acetonitrile (Θ = 45 °C). The viscosity of PMMA was measured as a function of temperature in the range 26–55 °C. The contraction and expansion of the molecular chains are determined using the measured viscosity values. The temperature dependence of the intrinsic viscosity can be represented by a master curve in a $\alpha_{\eta}^{3} |\tau | M^{1/2}_{w} \ (\hbox{g}^{1/2}\,\hbox{mol}^{-1/2})$ versus |τ|M w1/2 (g1/2 mol−1/2) plot, where τ = |T − Θ|/T is the reduced temperature and Mw‐is the weight‐average molecular weight. A universal plot of reduced viscosity versus reduced blob parameter (N/Nc) shows the attainment of the collapsed state below the theta temperature. The dimensions of PMMA in acetonitrile (Mw = 3.15 × 106 g mol−1) decrease to 63 % at 26 °C of those in the unperturbed state. The results in this work are compared with those previously published. © 2000 Society of Chemical Industry

Journal

Polymer InternationalWiley

Published: Dec 1, 2000

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