III International Conference

EFFECT OF LIQUID POLYKETONE ON THE PROPERTIESOF CUSHION RUBBERPP-III-23Semikolenov S.V., Dubkov K.A., Ivanov D.P., Voronchikhin V.D. 1 , Ershov D.V. 1 , Panov G.I.Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia1 Siberian State Technological University, Krasnoyarsk, RussiaE-mail: sersem@catalysis.ruEffect of a low-molecular polyketone (Mn = 2200, oxygen content 9.9 wt %) addition onphysico-mechanical and technologic properties of cushion rubber obtained with polyisopreneSKI-3 was studied. Polyketone addition was shown to increase the strength of rubber couplingwith metal cord, which will improve the performance of rubber-cord systems.Recently, a method of synthesizing new functional oligomers with a specifiedconcentration of carbonyl groups and a controllable molecular weight, has been developed atthe Boreskov Institute of Catalysis SB RAS. The method consists in treatment of unsaturatedpolymers containing double C=C bonds with nitrous oxide, N 2 O (the so-called carboxidation).Carboxidation proceeds via non-catalytic 1,3-dipolar cycloaddition of N 2 O to C=C bondsaccompanied by selective formation of C=O groups in the backbone.A small fraction of C=C bonds reacting with N 2 O is cleaved in the reaction, whichdecreases the molecular weight of the parent polymer. Thus, carboxidation of cis-1,4-polybutadiene (M n = 128000) at temperature 180–230 °С and pressure 30-80 atm yields liquidunsaturated polyketones, the oligomers containing double C=C bonds, (>C=O) groups, andaldehyde and vinyl end groups [1].Having a relatively low viscosity, the resulting liquid polyketones can be mixed withvarious ingredients and fillers. Due to the presence of carbonyl groups in the polymerbackbone, these polyketones have high polarity and good adhesion to metals and othermaterials.In this connection, these materials possibly could be used as modifying additives tocushion rubbers to improve the strength of their coupling with tire metal cord. For thispurpose, we studied the effect exerted by addition of liquid polyketone on physicomechanicaland technologic properties of the cushion rubber prepared with cis-1,4-polyisoprene SKI-3. The liquid low-molecular polyketone (oxygen content 9.9 wt %,Mn = 2200, Mw/Mn = 2.5) obtained by carboxidation of cis-1,4-polybutadiene SKD withnitrous oxide at 230°C for 18 hours was used as a modifying additive.511