Основан в 1907 году
в России и за рубежом
The regularities of formation of the blend structure based on isotactic polypropylene (iPP) and low-density polyethylene (LDPE) in a wide range of compositions are investigated. The processes of melting and crystallization, as well as the thermal properties of these blends are examined by differential scanning calorimetry. The structure and molecular mobility in the amorphous regions are studied by electron paramagnetic resonance spectroscopy (paramagnetic probe method). The mutual influence of both mixture components on the development of the composition morphology is found. Also three ranges of the blend composition (5–30; 30–70; 70–95 wt% of iPP) characterized by different structures and properties of crystalline and amorphous phases are determined. The partial compatibility in the amorphous regions of iPP and LDPE providing the interface layer formation is observed for the blends containing 30–95 wt% of iPP. In case of the content of iPP in the blend is less than 30 wt%, the abnormal process of iPP crystallization is determined. As a result the non-equilibrium molecular structure of the iPP/LDPE composition is formed.