Abstract
The gel/sol transition temperatures (T ) were measured by cooling of thermally reversible methyl cellulose (MC)-water gels using the ten MC samples. A linear relationship between 1/T and the logarithm ofv 2 x was found for each MC gel, wherev 2 is the volume fraction of MC andx the degree of polymerization. The X-ray diffraction patterns of both MC films and gels revealed that the network junction points of the MC gels are crystalline and consist of trimethyl glucose units. The heat of fusion of trimethyl cellulose was estimated as 2.6 × 103 J/mol, and entropy of dilution parameter = −1.6 andΘ = 320 K were also evaluated. Using these values, the gel/sol transition temperature was analysed according to our previous theory. It is concluded that the network junction points of MC gels are between 4 and 8 units long and also that the length is in good agreement with the sequence length estimated from the methoxy content of MC.
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