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  • Title: Concentration selective hydration and phase states of hydroxyethyl cellulose (HEC) in aqueous solutions.
    Author: Arfin N, Bohidar HB.
    Journal: Int J Biol Macromol; 2012 Apr 01; 50(3):759-67. PubMed ID: 22155401.
    Abstract:
    Solution behaviour of hydroxyethyl cellulose (HEC) is reported in the polymer concentration range spanning over two decades (c=0.002-5% (w/v)). The results conclude the following: (i) dilute solution regime prevailed for c<0.2% (w/v), flexible HEC fibres of typical length ≈ 1 μm and persistence length ≈ 10 nm were found here, (ii) for 0.2<c<1% (w/v), a semidilute phase comprising soluble aggregates of hydrated HEC fibrils were observed with the material exhibiting viscoelastic behaviour and (iii) when 1<c<5% (w/v) the solution behaved with melt-like attributes with substantial embedded heterogeneity; viscous to elastic transition was observed in this region. Raman spectral, and DSC data indicated distinctive hydration of HEC fibres in the aforesaid concentration regimes. Cole-Cole plots revealed phase homogeneity and miscibility was limited to concentrations less than ~2% (w/v). For higher polymer concentrations, strong fibre-fibre interactions prevailed and samples became heterogeneous.
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