Abstract
The crystal phase separation of mLLDPE/EVA (40/60) (wt/wt) blend was investigated by FTIR micro-spectroscopy in a sequential cooling process. To reveal microcosmic causation and details during the process, the changes of absorbance ratio corresponding to high and low vibrational states, and the apparent enthalpy differences of vibration energy states transformation (ΔHv) of characteristic groups in pure mLLDPE, pure E VA and mLLDPE/EVA blend were calculated based on FTIR spectra data. By analyzing ΔHv values of individual characteristic group relating to the exothermal peaks examined in the cooling process, it has been found that methylene groups play an important role in the crystal phase separation. Besides, the energy analysis of the corresponding methyl band at A1369.4/A1367.7cm-1 in blend indicated that the chain segments of EVA were involved in the phase separation and crystallization process of mLLDPE taking the form of cocrystallization, which further illuminate the results of DSC analysis. Simultaneously, the worse miscibility of ester and alkyl groups was proved by the absence of enthalpy changes at 110°C.
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