Excess Specific Heats in Miscible Binary Blends with Specific Interactions

M. Iriarte, M. Alberdi, S L Shenoy, J. J. Iruin

Research output: Contribution to journalArticle

Abstract

Excess specific heats of different binary blends involving different levels of relatively strong specific interactions have been determined from specific heats of the pure components and those of the blends. A heat-flux (Calvet) calorimeter and a step-by-step methodology have been used. Blends of poly-(hydroxy ether of bisphenol A) (phenoxy resin) with polyesters and polyethers, where specific interactions are supposed to play a role in miscibility, and blends with stronger hydrogen-bond interactions, such as poly(vinyl phenol)/poly(methyl methacrylate) (PVPh/PMMA), have been included in the study. Only the experimental excess specific heat for the PVPh/PMMA blend is negative, whereas those relative to phenoxy blends are all positive. These results have been analyzed on the basis of an association model specifically designed for polymer blends in which miscibility is mainly caused by hydrogen bonding. The model predicts, in all cases, a continuous decrease of the enthalpy of mixing with temperature, i.e., a negative value of. ?Cp. Equation of state effects have been included in the theoretical simulations, giving modified trends of the enthalpy of mixing with temperature in a more reasonable agreement with the experimental results.

Original languageEnglish
Pages (from-to)2661-2668
Number of pages8
JournalMacromolecules
Volume32
Issue number8
Publication statusPublished - 20 Apr 1999

Fingerprint

Specific heat
Polymethyl Methacrylate
Phenol
Phenoxy resins
Enthalpy
Hydrogen bonds
Solubility
Polyesters
Polyethers
Polymer blends
Calorimeters
Equations of state
Ether
Heat flux
Association reactions
Temperature
bisphenol A

Cite this

Iriarte, M., Alberdi, M., Shenoy, S. L., & Iruin, J. J. (1999). Excess Specific Heats in Miscible Binary Blends with Specific Interactions. Macromolecules, 32(8), 2661-2668.
Iriarte, M. ; Alberdi, M. ; Shenoy, S L ; Iruin, J. J. / Excess Specific Heats in Miscible Binary Blends with Specific Interactions. In: Macromolecules. 1999 ; Vol. 32, No. 8. pp. 2661-2668.
@article{31cf14c51f3e4a6f988d24b836308958,
title = "Excess Specific Heats in Miscible Binary Blends with Specific Interactions",
abstract = "Excess specific heats of different binary blends involving different levels of relatively strong specific interactions have been determined from specific heats of the pure components and those of the blends. A heat-flux (Calvet) calorimeter and a step-by-step methodology have been used. Blends of poly-(hydroxy ether of bisphenol A) (phenoxy resin) with polyesters and polyethers, where specific interactions are supposed to play a role in miscibility, and blends with stronger hydrogen-bond interactions, such as poly(vinyl phenol)/poly(methyl methacrylate) (PVPh/PMMA), have been included in the study. Only the experimental excess specific heat for the PVPh/PMMA blend is negative, whereas those relative to phenoxy blends are all positive. These results have been analyzed on the basis of an association model specifically designed for polymer blends in which miscibility is mainly caused by hydrogen bonding. The model predicts, in all cases, a continuous decrease of the enthalpy of mixing with temperature, i.e., a negative value of. ?Cp. Equation of state effects have been included in the theoretical simulations, giving modified trends of the enthalpy of mixing with temperature in a more reasonable agreement with the experimental results.",
author = "M. Iriarte and M. Alberdi and Shenoy, {S L} and Iruin, {J. J.}",
year = "1999",
month = "4",
day = "20",
language = "English",
volume = "32",
pages = "2661--2668",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "8",

}

Iriarte, M, Alberdi, M, Shenoy, SL & Iruin, JJ 1999, 'Excess Specific Heats in Miscible Binary Blends with Specific Interactions', Macromolecules, vol. 32, no. 8, pp. 2661-2668.

Excess Specific Heats in Miscible Binary Blends with Specific Interactions. / Iriarte, M.; Alberdi, M.; Shenoy, S L; Iruin, J. J.

In: Macromolecules, Vol. 32, No. 8, 20.04.1999, p. 2661-2668.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Excess Specific Heats in Miscible Binary Blends with Specific Interactions

AU - Iriarte, M.

AU - Alberdi, M.

AU - Shenoy, S L

AU - Iruin, J. J.

PY - 1999/4/20

Y1 - 1999/4/20

N2 - Excess specific heats of different binary blends involving different levels of relatively strong specific interactions have been determined from specific heats of the pure components and those of the blends. A heat-flux (Calvet) calorimeter and a step-by-step methodology have been used. Blends of poly-(hydroxy ether of bisphenol A) (phenoxy resin) with polyesters and polyethers, where specific interactions are supposed to play a role in miscibility, and blends with stronger hydrogen-bond interactions, such as poly(vinyl phenol)/poly(methyl methacrylate) (PVPh/PMMA), have been included in the study. Only the experimental excess specific heat for the PVPh/PMMA blend is negative, whereas those relative to phenoxy blends are all positive. These results have been analyzed on the basis of an association model specifically designed for polymer blends in which miscibility is mainly caused by hydrogen bonding. The model predicts, in all cases, a continuous decrease of the enthalpy of mixing with temperature, i.e., a negative value of. ?Cp. Equation of state effects have been included in the theoretical simulations, giving modified trends of the enthalpy of mixing with temperature in a more reasonable agreement with the experimental results.

AB - Excess specific heats of different binary blends involving different levels of relatively strong specific interactions have been determined from specific heats of the pure components and those of the blends. A heat-flux (Calvet) calorimeter and a step-by-step methodology have been used. Blends of poly-(hydroxy ether of bisphenol A) (phenoxy resin) with polyesters and polyethers, where specific interactions are supposed to play a role in miscibility, and blends with stronger hydrogen-bond interactions, such as poly(vinyl phenol)/poly(methyl methacrylate) (PVPh/PMMA), have been included in the study. Only the experimental excess specific heat for the PVPh/PMMA blend is negative, whereas those relative to phenoxy blends are all positive. These results have been analyzed on the basis of an association model specifically designed for polymer blends in which miscibility is mainly caused by hydrogen bonding. The model predicts, in all cases, a continuous decrease of the enthalpy of mixing with temperature, i.e., a negative value of. ?Cp. Equation of state effects have been included in the theoretical simulations, giving modified trends of the enthalpy of mixing with temperature in a more reasonable agreement with the experimental results.

UR - http://www.scopus.com/inward/record.url?scp=0001142353&partnerID=8YFLogxK

M3 - Article

VL - 32

SP - 2661

EP - 2668

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 8

ER -

Iriarte M, Alberdi M, Shenoy SL, Iruin JJ. Excess Specific Heats in Miscible Binary Blends with Specific Interactions. Macromolecules. 1999 Apr 20;32(8):2661-2668.