A two-step isothermal annealing (TSIA) procedure is described that enables the endothermic peaks of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE) and their blends, to be satisfactorily resolved during analysis by differential scanning calorimetry. A modified form of multistep isothermal annealing, the TSIA procedure produces a highly characteristic profile of the blend components by facilitating the segregation of the phases based on branch density. It is proposed that the TSIA procedure may have significant merit in the identification and quantification of the components in an unknown blend as well as increasing the sensitivity in analytical procedures aimed at blend component quantification.
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Cran, M., Bigger, S. & Scheirs, J. Characterizing blends of linear low-density and low-density polyethylene by DSC. J Therm Anal Calorim 81, 321–327 (2005). https://doi.org/10.1007/s10973-005-0786-3