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A study of the crystal phase separation of mLLDPE/EVA blend

机译：mLLDPE / EVA共混物的结晶相分离研究

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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 EVA 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℃.
机译：在连续冷却过程中，通过FTIR显微光谱研究了mLLDPE / EVA（40/60）（wt / wt）共混物的晶体相分离。为了揭示过程中的微观原因和细节，高低振动状态对应的吸光度变化以及纯mLLDPE，纯EVA和mLLDPE / EVA共混物中特征基团的振动能态转变的明显焓差（ΔHv）基于FTIR光谱数据计算。通过分析与在冷却过程中检查的放热峰有关的各个特征基的ΔHv值，发现亚甲基在结晶相分离中起着重要作用。此外，共混物中A1369.4 / A1367.7cm-1处相应甲基带的能量分析表明，EVA的链段以共结晶的形式参与了mLLDPE的相分离和结晶过程，进一步阐明了该现象。 DSC分析的结果。同时，在110℃没有焓变证明了酯和烷基的混溶性更差。

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