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Diffusion and phase behavior of a hydroxypropylcellulose-poly(ethylene glycol) system

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Abstract

The solubility and interdiffusion between hydroxypropylcellulose samples of various molecular masses (M w = 8 × 104, 14 × 104, 37 × 104, 85 × 104, and 115 × 104) and poly(ethylene glycol) (M w = 400 and 1500) in the range 18–210°C have been studied by optical interferometry and polarization microscopy methods. Oligomeric poly(ethylene glycols) have been considered as solvents for hydroxypropylcellulose. Phase diagrams have been constructed, and Flory-Huggins thermodynamic interaction parameters have been calculated. For the hydroxypropylcellulose-poly(ethylene glycol) 400 system, an LC and crystalline equilibria have been realized. An increase in the M w of hydroxypropylcellulose to 1500 leads to the appearance of a wide region of amorphous phase segregation with a UCST, whereas the liquidus line is conserved at high concentrations of hydroxypropylcellulose. Such a superposition of two kinds of phase equilibrium that is achieved only with a change in M w of the oligomeric solvent has been observed for the first time. For all the systems under examination, the kinetics of diffusion mixing has been estimated and the activation energies of the process have been calculated. The concentration dependences of diffusion coefficients demonstrate jumps in the mesomorphic-transition region.

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Authors and Affiliations

  1. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia

    V. V. Makarova, A. K. Tereshin & V. G. Kulichikhin

  2. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    V. K. Gerasimov & A. E. Chalykh

Authors
  1. V. V. Makarova
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  2. V. K. Gerasimov
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  3. A. K. Tereshin
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  4. A. E. Chalykh
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  5. V. G. Kulichikhin
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Additional information

Original Russian Text © V.V. Makarova, V.K. Gerasimov, A.K. Tereshin, A.E. Chalykh, V.G. Kulichikhin, 2007, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2007, Vol. 49, No. 4, pp. 663–673.

This work was supported by the Russian Foundation for Basic Research, project no. 05-03-08028.

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Makarova, V.V., Gerasimov, V.K., Tereshin, A.K. et al. Diffusion and phase behavior of a hydroxypropylcellulose-poly(ethylene glycol) system. Polym. Sci. Ser. A 49, 433–441 (2007). https://doi.org/10.1134/S0965545X07040104

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  • DOI: https://doi.org/10.1134/S0965545X07040104

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