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

摘要：

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℃.

关键词： Metallocene linear low density polyethylene Ethylene/vinyl acetate copolymer Crystal phase separation

作者: Z H Deng

作者单位: Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China

会议类型: 国际会议

会议名称: The 8th China International Nanoscience and Technology Symposium(2009第八届中国国际纳米科技湘潭研讨会Cinsts09)

会议地点: 湖南湘潭

会议语种:英文

页码: 1-9

在线出版日期: 2009-10-23（万方平台首次上网日期，不代表论文的发表时间）