Effect of crosslinks on the thermodynamics of poly(vinyl alcohol) hydrogels

Gregory B. McKenna; Ferenc Horkay

doi:10.1016/S0032-3861(05)80049-7

Effect of crosslinks on the thermodynamics of poly(vinyl alcohol) hydrogels

Gregory B. McKenna, Ferenc Horkay

Chemical Engineering

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Abstract

The Flory-Huggins interaction parameter χ_gel was determined for chemically crosslinked poly(vinyl alcohol) (PVA) hydrogels from swelling pressure and elastic modulus measurements. The PVA gels were prepared in aqueous solutions of different molecular weight (22 000 < M_w < 346 000). Crosslinks were introduced at different polymer concentrations (3% w/w ≤ c₀ ≤ 12% w/w). It is found that in all systems the values of χ_gel for the crosslinked polymer are greater than the values of χ_sol for the uncrosslinked material at identical concentrations. The χ_gel data reported here seem to be a function only of the polymer concentration and are independent of the details of the network structure. The results are discussed in relation to other work on the crosslink dependence and volume fraction dependence of χ_gel.

Original language	English
Pages (from-to)	5737-5742
Number of pages	6
Journal	Polymer
Volume	35
Issue number	26
DOIs	https://doi.org/10.1016/S0032-3861(05)80049-7
State	Published - 1994

Keywords

PVA hydrogels
crosslinks
thermodynamics

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10.1016/S0032-3861(05)80049-7

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@article{67aeaa35c0a3446dafcf1c84d2773917,

title = "Effect of crosslinks on the thermodynamics of poly(vinyl alcohol) hydrogels",

abstract = "The Flory-Huggins interaction parameter χgel was determined for chemically crosslinked poly(vinyl alcohol) (PVA) hydrogels from swelling pressure and elastic modulus measurements. The PVA gels were prepared in aqueous solutions of different molecular weight (22 000 < Mw < 346 000). Crosslinks were introduced at different polymer concentrations (3% w/w ≤ c0 ≤ 12% w/w). It is found that in all systems the values of χgel for the crosslinked polymer are greater than the values of χsol for the uncrosslinked material at identical concentrations. The χgel data reported here seem to be a function only of the polymer concentration and are independent of the details of the network structure. The results are discussed in relation to other work on the crosslink dependence and volume fraction dependence of χgel.",

keywords = "PVA hydrogels, crosslinks, thermodynamics",

author = "McKenna, {Gregory B.} and Ferenc Horkay",

note = "Funding Information: F. H. acknowledges the tenure of a Visiting Scientist position at the National Institute of Standards and Technology, Gaithersburg, MD, USA. Part of this work was supported by the Hungarian Academy of Sciences under research contract OTKA 2158.",

year = "1994",

doi = "10.1016/S0032-3861(05)80049-7",

language = "English",

volume = "35",

pages = "5737--5742",

journal = "Polymer",

issn = "0032-3861",

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TY - JOUR

T1 - Effect of crosslinks on the thermodynamics of poly(vinyl alcohol) hydrogels

AU - McKenna, Gregory B.

AU - Horkay, Ferenc

N1 - Funding Information: F. H. acknowledges the tenure of a Visiting Scientist position at the National Institute of Standards and Technology, Gaithersburg, MD, USA. Part of this work was supported by the Hungarian Academy of Sciences under research contract OTKA 2158.

PY - 1994

Y1 - 1994

N2 - The Flory-Huggins interaction parameter χgel was determined for chemically crosslinked poly(vinyl alcohol) (PVA) hydrogels from swelling pressure and elastic modulus measurements. The PVA gels were prepared in aqueous solutions of different molecular weight (22 000 < Mw < 346 000). Crosslinks were introduced at different polymer concentrations (3% w/w ≤ c0 ≤ 12% w/w). It is found that in all systems the values of χgel for the crosslinked polymer are greater than the values of χsol for the uncrosslinked material at identical concentrations. The χgel data reported here seem to be a function only of the polymer concentration and are independent of the details of the network structure. The results are discussed in relation to other work on the crosslink dependence and volume fraction dependence of χgel.

AB - The Flory-Huggins interaction parameter χgel was determined for chemically crosslinked poly(vinyl alcohol) (PVA) hydrogels from swelling pressure and elastic modulus measurements. The PVA gels were prepared in aqueous solutions of different molecular weight (22 000 < Mw < 346 000). Crosslinks were introduced at different polymer concentrations (3% w/w ≤ c0 ≤ 12% w/w). It is found that in all systems the values of χgel for the crosslinked polymer are greater than the values of χsol for the uncrosslinked material at identical concentrations. The χgel data reported here seem to be a function only of the polymer concentration and are independent of the details of the network structure. The results are discussed in relation to other work on the crosslink dependence and volume fraction dependence of χgel.

KW - PVA hydrogels

KW - crosslinks

KW - thermodynamics

UR - http://www.scopus.com/inward/record.url?scp=0028712949&partnerID=8YFLogxK

U2 - 10.1016/S0032-3861(05)80049-7

DO - 10.1016/S0032-3861(05)80049-7

M3 - Article

AN - SCOPUS:0028712949

SN - 0032-3861

VL - 35

SP - 5737

EP - 5742

JO - Polymer

JF - Polymer

IS - 26

ER -

Effect of crosslinks on the thermodynamics of poly(vinyl alcohol) hydrogels

Abstract

Keywords

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