The heat of transition from Form I to Form II, ΩHt, and from Form II to the melt have been measured by DSC for poly(trans-1,4-butadiene) crystals prepared from three solvents: heptane, toluene, and benzene. Broad-line NMR measurements were obtained on PTBD crystals from heptane and toluene in the dry state and wetted with a nonprotonated solvent, CS2. The ΩHt values and the NMR narrow line-broad line intensity ratios support earlier assertions, based on a comparison of IR and epoxidation results, concerning the location of the amorphous regions in PTBD cyrstals.
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Ng et al. (1973) studied this question.
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