Abstract
The effect of epoxidation of trans-1,4-polyisoprene (TPI) on the glass transition temperature T g and crystallization of the polymer has been investigated by differential scanning calorimetry. The value of T g is shown to be linearly dependent on the extent of chain modification, and increases from 201K for the unmodified polymer to 274K for complete epoxidation. The modification inhibits the extent of crystallization, and above 25 mol% epoxidation little or no cold crystallization occurs at 263K. The extent of crystallization is found to fit a previously proposed relationship: log( ΔH m) = log k + nlog x A, where ΔH m is the heat of fusion, k a constant, n the critical sequence length of repeating units for crystallization to occur and x A the mole fraction of unmodified repeat units. For TPI, values of n = 6–7 are found for samples crystallized at 263K.
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