In-situ analysis and quantification of swelling kinetics in glassy and rubbery networks using [sup 1]H and [sup 19]F magnetic resonance microscopies

Journal Article · Mon Apr 25 00:00:00 EDT 1994 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00087a033· OSTI ID:7112047

Cody, G D; Botto, R E ^[1]

---

1. Argonne National Lab., Argonne, IL (United States). Chemistry Div.

[sup 1]H and [sup 19]F magnetic resonance microscopies are used to determine the characteristics of diffusion in four different network-solvent systems. Transport of methanol in poly(ethyl methacrylate) (PEMA) and pyridine in coal is explored and compared with Fickian transport of toluene in polybutadiene rubber (PBD) and hexafluorobenzene in poly(methyl silicone) (PMS). These former two systems are characterized by sharp solvent fronts which propagate into the cores of the samples at a constant velocity. The swelling kinetics are quantified by applying a simple model which couples the kinetics of solvent diffusion to a second-order phase transition which induces network relaxation. Parameterization is accomplished with two kinetic terms and one thermodynamic parameter. These are a mass-fixed glassy diffusion coefficient, a network relaxation constant, and a critical concentration corresponding to the concentration of solvent necessary to induce a glass to rubber transition. Solvent from velocities, obtained through magnetic resonance microscopy, are used with independently derived critical concentrations to calculate the glassy diffusion coefficient and network relaxation rate constant. Kinetic swelling data are then fit with theoretical uptake curves computed using these parameters. A high-quality fit demonstrates that the proposed model successfully quantifies non-Fickian transport using a small number of physical based dynamic parameters.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7112047
• Journal Information: Macromolecules; (United States), Vol. 27:9; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
COAL
PERMEABILITY
FLUORINATED AROMATIC HYDROCARBONS
DIFFUSION
METHANOL
POLYACRYLATES
PYRIDINE
RUBBERS
SILICONES
TOLUENE
COMPARATIVE EVALUATIONS
FLUORINE 19
HYDROGEN 1
SWELLING
ALCOHOLS
ALKYLATED AROMATICS
AROMATICS
AZINES
CARBONACEOUS MATERIALS
ELASTOMERS
ENERGY SOURCES
ESTERS
EVALUATION
FLUORINE ISOTOPES
FOSSIL FUELS
FUELS
HALOGENATED AROMATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROXY COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MATERIALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
POLYMERS
POLYVINYLS
PYRIDINES
SILOXANES
STABLE ISOTOPES
010600* - Coal
Lignite
& Peat- Properties & Composition
360606 - Other Materials- Physical Properties- (1992-)