The effect of the components of the modifying system on the impact strength and deformation strength characteristics of polypropylene/nitrile butadiene rubber (NBR) composites obtained by reactive compounding was investigated. Studies were conducted on composites containing 23 wt% BNKS-18AMN nitrile butadiene rubber and peroxide modifying system coagents – polar vinyl monomers: maleic anhydride (MA), its polyester with monoethylene glycol (MEG), and a complex of MEG with aromatic amine antioxidant Diaphene FP (DFP). At the same time, we introduced presynthesised compatibilisers based on blends of polypropylene with elastomers of different polarity: ternary ethylene propylene diene copolymer (EPDM) and an NBR modified by grafting of MA or MEG + DFP. It was established that, in this series of coagents, the MEG + DFP complex ensures the most effective dispersion of the BNKS-18AMN phase in the polypropylene matrix during reactive compounding of composites and, in accordance with this, leads to a significant increase in their impact strength and elongation at break. Here, the greatest specificity and effectiveness are possessed by compatibilisers into which an elastomer phase has been introduced: blends of polypropylene with non-polar EPDM, modified with MA, or blends with polar BNKS-18AMN, modified with an MEG + DFP complex.
In order to improve the balance of flow, impact strength, and physicomechanical properties of polypropylene/nitrile butadiene rubber composites of structural designation, we investigated the possibility of using two complementary approaches in the process of manufacturing the composites. Firstly, this involves the introduction into the composition of these composites of special polymeric compatibilisers based on maleinised polypropylene with additions of elastomers of different nature. Secondly, it involves the use of the method of dynamic vulcanisation in the process of reactive extrusion of a PP/BNKS-18AMN blend with a peroxide modifying system including as a coagent a complex of polar vinyl monomer (maleic acid polyester and ethylene glycol) with aramine industrial antioxidant Diafen FP. Determination of the principal physicomechanical characteristics of the composites revealed that only the combined use of these two methods of modification makes it possible to achieve a significant shift in the level of impact strength of PP/NBR composites without adversely affecting other indices, with control of the flow of the end products. Here, the most effective compatibilisers were maleinised blends of polypropylene with non-polar elastomers: ethylene–octene copolymer (Engage 8842) and ternary ethylenepropylene rubber (Royalene 563). It is assumed that a probable cause of the improvement in properties of the polymer blends is the considerable increase in the degree of dispersion of the rubber phase of the NBR in the polypropylene matrix under the action of the modification processes described above.
Influence of heterogeneous textures of polypropylene/ethylene-propylene-rubber blends on dynamic viscoelastic properties in molten stateAbstract. The study concerned the effect of molecular-mass characteristics and Mooney viscosity of the initial EPDM rubber on the changes in the structure, impact strength and rheological properties of PP/EPDM blends as a result of their modification in a melt under the action of organic peroxide and peroxide-trimethylolpropane triacrylate (TMPTA) system.
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