The chemical composition distribution (CCD) of LLDPE (1‐butene comonomer) has been studied by thermal analysis. After an opportune thermal treatment of the polymers, thermal fractionated crystallization (TFC), the melting endotherms have been subdivided in areas with fixed temperature ranges. The distribution of the endotherms in different areas gave a semiquantitative idea of the CCD. The comparison with thermal rising elution fractionation and 13C NMR data of the whole polymers and fractions showed fairly good correlations. An approximate evaluation of the average ethylene sequence length was also obtained.
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Balbontin et al. (1994) studied this question.
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