Enthalpy relaxation of styrene-maleic anhydride (SMA) copolymers. 2. Blends with poly(methyl methacrylate) (PMMA)

N R Cameron; John Mackenzie Grant Cowie; Roderick Ferguson; I J McEwan

doi:10.1016/S0032-3861(01)00196-3

Enthalpy relaxation of styrene-maleic anhydride (SMA) copolymers. 2. Blends with poly(methyl methacrylate) (PMMA)

N R Cameron, John Mackenzie Grant Cowie, Roderick Ferguson, I J McEwan

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

15 Citations (Scopus)

Abstract

The enthalpy relaxation of miscible blends of styrene-maleic anhydride (SMA) copolymers and poly(methyl methacrylate) (PMMA) has been studied, and the enthalpic data modelled using the Cowie-Ferguson (CF) semi-empirical approach. The blend behaviour in each case was not predictable from the concentration of each component. For the blend with the lower MA content copolymer (SMA2/PMMA), the enthalpy lost by the fully relaxed glass was greater than for either component, whereas the higher MA content copolymer blend (SMA4/ PMMA) aged in a manner very similar to PMMA itself. In each case, the blends relaxed more slowly than their components and the distribution of relaxation times was broader. This implies that each blend has a lower free volume than its components; however, this conflicts with the enthalpic data for SMA2/PMMA. Reasons for this apparent contradiction are given. It is likely that concentration fluctuations are present in the SMA4/PMMA blend, suggested by a broad transition range at T_g, which may explain its slower relaxation behaviour. © 2001 Elsevier Science Ltd.

Original language	English
Pages (from-to)	6991-6997
Number of pages	7
Journal	Polymer
Volume	42
Issue number	16
DOIs	https://doi.org/10.1016/S0032-3861(01)00196-3
Publication status	Published - Jul 2001

Keywords

Enthalpy relaxation
Poly(methyl methacrylate)
Styrene - Maleic anhydride

Access to Document

10.1016/S0032-3861(01)00196-3

Cite this

@article{a181da690a5b401db2cd154eb04504df,

title = "Enthalpy relaxation of styrene-maleic anhydride (SMA) copolymers. 2. Blends with poly(methyl methacrylate) (PMMA)",

abstract = "The enthalpy relaxation of miscible blends of styrene-maleic anhydride (SMA) copolymers and poly(methyl methacrylate) (PMMA) has been studied, and the enthalpic data modelled using the Cowie-Ferguson (CF) semi-empirical approach. The blend behaviour in each case was not predictable from the concentration of each component. For the blend with the lower MA content copolymer (SMA2/PMMA), the enthalpy lost by the fully relaxed glass was greater than for either component, whereas the higher MA content copolymer blend (SMA4/ PMMA) aged in a manner very similar to PMMA itself. In each case, the blends relaxed more slowly than their components and the distribution of relaxation times was broader. This implies that each blend has a lower free volume than its components; however, this conflicts with the enthalpic data for SMA2/PMMA. Reasons for this apparent contradiction are given. It is likely that concentration fluctuations are present in the SMA4/PMMA blend, suggested by a broad transition range at Tg, which may explain its slower relaxation behaviour. {\textcopyright} 2001 Elsevier Science Ltd.",

keywords = "Enthalpy relaxation, Poly(methyl methacrylate), Styrene - Maleic anhydride",

author = "Cameron, {N R} and Cowie, {John Mackenzie Grant} and Roderick Ferguson and McEwan, {I J}",

year = "2001",

month = jul,

doi = "10.1016/S0032-3861(01)00196-3",

language = "English",

volume = "42",

pages = "6991--6997",

journal = "Polymer",

issn = "0032-3861",

publisher = "Elsevier",

number = "16",

}

TY - JOUR

T1 - Enthalpy relaxation of styrene-maleic anhydride (SMA) copolymers. 2. Blends with poly(methyl methacrylate) (PMMA)

AU - Cameron, N R

AU - Cowie, John Mackenzie Grant

AU - Ferguson, Roderick

AU - McEwan, I J

PY - 2001/7

Y1 - 2001/7

N2 - The enthalpy relaxation of miscible blends of styrene-maleic anhydride (SMA) copolymers and poly(methyl methacrylate) (PMMA) has been studied, and the enthalpic data modelled using the Cowie-Ferguson (CF) semi-empirical approach. The blend behaviour in each case was not predictable from the concentration of each component. For the blend with the lower MA content copolymer (SMA2/PMMA), the enthalpy lost by the fully relaxed glass was greater than for either component, whereas the higher MA content copolymer blend (SMA4/ PMMA) aged in a manner very similar to PMMA itself. In each case, the blends relaxed more slowly than their components and the distribution of relaxation times was broader. This implies that each blend has a lower free volume than its components; however, this conflicts with the enthalpic data for SMA2/PMMA. Reasons for this apparent contradiction are given. It is likely that concentration fluctuations are present in the SMA4/PMMA blend, suggested by a broad transition range at Tg, which may explain its slower relaxation behaviour. © 2001 Elsevier Science Ltd.

AB - The enthalpy relaxation of miscible blends of styrene-maleic anhydride (SMA) copolymers and poly(methyl methacrylate) (PMMA) has been studied, and the enthalpic data modelled using the Cowie-Ferguson (CF) semi-empirical approach. The blend behaviour in each case was not predictable from the concentration of each component. For the blend with the lower MA content copolymer (SMA2/PMMA), the enthalpy lost by the fully relaxed glass was greater than for either component, whereas the higher MA content copolymer blend (SMA4/ PMMA) aged in a manner very similar to PMMA itself. In each case, the blends relaxed more slowly than their components and the distribution of relaxation times was broader. This implies that each blend has a lower free volume than its components; however, this conflicts with the enthalpic data for SMA2/PMMA. Reasons for this apparent contradiction are given. It is likely that concentration fluctuations are present in the SMA4/PMMA blend, suggested by a broad transition range at Tg, which may explain its slower relaxation behaviour. © 2001 Elsevier Science Ltd.

KW - Enthalpy relaxation

KW - Poly(methyl methacrylate)

KW - Styrene - Maleic anhydride

U2 - 10.1016/S0032-3861(01)00196-3

DO - 10.1016/S0032-3861(01)00196-3

M3 - Article

SN - 0032-3861

VL - 42

SP - 6991

EP - 6997

JO - Polymer

JF - Polymer

IS - 16

ER -

Enthalpy relaxation of styrene-maleic anhydride (SMA) copolymers. 2. Blends with poly(methyl methacrylate) (PMMA)

Abstract

Keywords

Access to Document

Fingerprint

Cite this