Enthalpy relaxation in poly(4-hydroxystyrene)/poly(methyl methacrylate) blends

I. M G Cowie; Valeria Arrighi; Elizabeth Anne McGonigle

doi:10.1002/macp.200400485

Enthalpy relaxation in poly(4-hydroxystyrene)/poly(methyl methacrylate) blends

I. M G Cowie, Valeria Arrighi, Elizabeth Anne McGonigle

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The influence of blend composition on enthalpy relaxation behaviour was assessed for miscible blends of poly(4-hydroxystyrene)/poly(methyl methacrylate) (PHS/PMMA). Values of enthalpy lost (?H(T_a, t_a)) were calculated from experimental data plotted against log₁₀(t _a) and modelled using the Cowie-Ferguson (CF) semi-empirical model. This gives a set of values for three adjustable parameters, ?H ₈(T_a), log10(t_c) and ß. The blends relaxed more slowly than PMMA, but more quickly and less co-operatively than PHS. Moreover, the blends released more enthalpy than PMMA, but less than PHS. The enthalpy lost by the fully relaxed glass (?H₈(T _a)) was less than the theoretical amount possible on reaching the state defined by the liquid enthalpy line extrapolated into the glassy region (?H_max(T_a)). Infrared spectroscopy was used for assessing the hydrogen bonding interactions in the blends. The ageing results are discussed with reference to the hydrogen bonding interactions. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Original language	English
Pages (from-to)	767-776
Number of pages	10
Journal	Macromolecular Chemistry and Physics
Volume	206
Issue number	7
DOIs	https://doi.org/10.1002/macp.200400485
Publication status	Published - 6 Apr 2005

Keywords

Ageing
Blends
Enthalpy relaxation
Hydrogen bonding

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title = "Enthalpy relaxation in poly(4-hydroxystyrene)/poly(methyl methacrylate) blends",

abstract = "The influence of blend composition on enthalpy relaxation behaviour was assessed for miscible blends of poly(4-hydroxystyrene)/poly(methyl methacrylate) (PHS/PMMA). Values of enthalpy lost (?H(Ta, ta)) were calculated from experimental data plotted against log10(t a) and modelled using the Cowie-Ferguson (CF) semi-empirical model. This gives a set of values for three adjustable parameters, ?H 8(Ta), log10(tc) and {\ss}. The blends relaxed more slowly than PMMA, but more quickly and less co-operatively than PHS. Moreover, the blends released more enthalpy than PMMA, but less than PHS. The enthalpy lost by the fully relaxed glass (?H8(T a)) was less than the theoretical amount possible on reaching the state defined by the liquid enthalpy line extrapolated into the glassy region (?Hmax(Ta)). Infrared spectroscopy was used for assessing the hydrogen bonding interactions in the blends. The ageing results are discussed with reference to the hydrogen bonding interactions. {\textcopyright} 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.",

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author = "Cowie, {I. M G} and Valeria Arrighi and McGonigle, {Elizabeth Anne}",

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AU - Arrighi, Valeria

AU - McGonigle, Elizabeth Anne

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N2 - The influence of blend composition on enthalpy relaxation behaviour was assessed for miscible blends of poly(4-hydroxystyrene)/poly(methyl methacrylate) (PHS/PMMA). Values of enthalpy lost (?H(Ta, ta)) were calculated from experimental data plotted against log10(t a) and modelled using the Cowie-Ferguson (CF) semi-empirical model. This gives a set of values for three adjustable parameters, ?H 8(Ta), log10(tc) and ß. The blends relaxed more slowly than PMMA, but more quickly and less co-operatively than PHS. Moreover, the blends released more enthalpy than PMMA, but less than PHS. The enthalpy lost by the fully relaxed glass (?H8(T a)) was less than the theoretical amount possible on reaching the state defined by the liquid enthalpy line extrapolated into the glassy region (?Hmax(Ta)). Infrared spectroscopy was used for assessing the hydrogen bonding interactions in the blends. The ageing results are discussed with reference to the hydrogen bonding interactions. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

AB - The influence of blend composition on enthalpy relaxation behaviour was assessed for miscible blends of poly(4-hydroxystyrene)/poly(methyl methacrylate) (PHS/PMMA). Values of enthalpy lost (?H(Ta, ta)) were calculated from experimental data plotted against log10(t a) and modelled using the Cowie-Ferguson (CF) semi-empirical model. This gives a set of values for three adjustable parameters, ?H 8(Ta), log10(tc) and ß. The blends relaxed more slowly than PMMA, but more quickly and less co-operatively than PHS. Moreover, the blends released more enthalpy than PMMA, but less than PHS. The enthalpy lost by the fully relaxed glass (?H8(T a)) was less than the theoretical amount possible on reaching the state defined by the liquid enthalpy line extrapolated into the glassy region (?Hmax(Ta)). Infrared spectroscopy was used for assessing the hydrogen bonding interactions in the blends. The ageing results are discussed with reference to the hydrogen bonding interactions. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

KW - Ageing

KW - Blends

KW - Enthalpy relaxation

KW - Hydrogen bonding

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JO - Macromolecular Chemistry and Physics

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ER -

Enthalpy relaxation in poly(4-hydroxystyrene)/poly(methyl methacrylate) blends

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Keywords

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