Abstract
The solvent self-diffusion coefficient has been studied in thermoshrinking poly(N-isopropyl acrylamide) microgel dispersions by the pulsed-gradient spin-echo PGSE-NMR technique, as a function of temperature and mass fraction. After suitable corrections for the temperature, the H2O/D2O ratio and the relative volume fractions, all the self-diffusion data obtained over a temperature range of approximately 40 °C and mass fraction (2–12 % wt/wt) could be superimposed with the volume fraction as the universal factor. The observed reduction in the solvent self-diffusion coefficient with volume fraction was greater than that predicted by simple obstruction theory. After correction for-, and the subsequent removal of the obstruction effect, the diffusion of the solvent through the core of the particle is elucidated. As found for other polymer-solvent systems, there were no specific binding effects. The diffusion of the solvent in these dispersions over such temperature and mass fraction ranges could be rationalised assuming a constant solvent self-diffusion coefficient in the core of the particles.
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References
Snowden MJ, Vincent B, Morgan JC (1993) UK Patent GB2262117a
Snowden MJ, Vincent B (1992) Chem Commun 1103
Otake K, Inomata H, Konno M, Saito S (1990) Macromolecules 23:283
Snowden MJ, Murray M, Friduddin R, Ihtshamul H, Cook J, Chowdhry BZ (1994) Chem Commun (submitted:)
Tam KC, Ragaram S, Pelton RH (1994) Langmuir 10:418
Pankasem S, Thomas JK, Snowden MJ, Vincent B (1994) Langmuir submitted:
Stilbs P (1987) Prog Nucl Magn Reson Spectrosc 19:1
Stilbs P (1994) Solubility in Surfactant Aggregates (Surfactant Science Series) Christian D Scamehorn JF Marcel Dekker, Inc., New York
Söderman O, Stilbs P (1994) Prog Nucl Magn Reson Spectrosc 26:445
Stilbs P, Lindman B (1984) Prog Colloid Polym Sci 69:39
Lindman B, Stilbs P (1987) Microemulsions: Struct. Dyn., 119–52. Edited by: Friberg, Stig E.; Bothorel, Pierre, CRC: Boca Raton, Fla.
Von Meerwall E, Mahoney D, Iannacchione G, Skowronski D (1990) J Colloid Interface Sci 139:437
Cheever E, Blum FD, Foster KR, Mackay RA (1985) J Colloid Interface Sci 104:121
Chiew YC, Glandt ED (1983) J Colloid Interface Sci 94:90
Muhr AH, Blanshard JM (1982) Polymer 23:1012
Beall PT (1983) Cryobiology 20:324
Lauffer MA (1961) J Biophys 1:205
Waggoner RA, Blum FD, Macelroy JMD (1993) Macromolecules 26:6841
Macelroy JMD, Kelly JJ (1985) AIChE J 31:35
Jösson B, Wennerström H, Nilsson PG, Linse P (1986) Colloid Polymer Sci 264:77
Cosgrove T, Griffiths PC (1994) Colloid Surface A 84:249
Pelton RH, Chibante P (1991) Colloids Surf 58:271
Stejskal EO, Tanner JE (1965) J Chem Phys 42:288
Saarinen TR, Woodward WS (1988) Rev Sci Instrum 59:761
Callaghan PT, Le Gros MA, Pinder DN (1983) J Chem Phys 79:6372
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Griffiths, P.C., Stilbs, P., Chowdhry, B.Z. et al. PGSE-NMR studies of solvent diffusion in poly(N-isopropylacrylamide) colloidal microgels. Colloid Polym Sci 273, 405–411 (1995). https://doi.org/10.1007/BF00652357
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DOI: https://doi.org/10.1007/BF00652357