Mixtures Based on Poly(3-Hydroxybutyrate) and Dual Ethylene-Propylene Copolymer: the Role of the Interfacial Layer
A. A. OLKHOV1,2, M. A. GOLDSHTRAKH3, L. S. SHIBRYAEVA4, Yu. V. TERTYSHNAYA4, A. N. KOVALEVA5, A. L. ZHULKINA2, A. L. IORDANSKIY2
1Plekhanov Russian Economic University, Moscow, Russia
2Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
3Ministry of Finance of the Russian Federation, Gochran of Russia, Moscow, Russia
4Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia
5Moscow Technological University, Moscow, Russia
Keywords: смеси полимеров, полигидроксибутират, двойной этиленпропиленовый сополимер, термоокисление, структура, mixtures of polymers, polyhydroxybutyrate, double ethylene-propylene copolymer, thermo-oxidation, structure
Abstract
The morphology of mixtures based on polyhydroxybutyrate (PHB) and ethylene-propylene copolymer (EPDM) was studied. Polymer blending was carried out by hot pressing. Flat films obtained by the method of direct hot pressing served as the study objects. Analysis of mixtures was performed using a set of structure-sensitive methods: physicomechanical, scanning electron microscopy and DSC. The resulting dependencies have three concentration areas that characterize the phase structure of mixtures. The first region (0-40 % of PHB) corresponds to the system of the continuous EPDM matrix and dispersed PHB phase. The second area (50-70 % of PHB) is characterized by a structure of two continuous phases (EPDM and PHB) and the largest interphase boundary. The third area consists of the continuous PHB phase and dispersed EPDM phase. Average particle sizes of the dispersed phase were determined. It was shown that EPDM and PHB were characterized by a low reactivity towards oxygen. It was determined that the formation of the interfacial layer led to an increase of the reactivity of the mixtures towards oxygen, particularly in the area of phase inversion.
|
