On Effect of Different Oil Content on Properties of High-Molecular Neodymium <i>cis</i>-1,4-Polybutadiene
The influence of MES oil (trade mark Norman-132) and TDAE oil (trade mark Norman-346) in different content on rubber compounds and vulcanizates based on high-molecular cis -1,4-polybutadiene Nd-BR/CKDN (SKDN) were studied. The results were compared with properties of import oil-extended analogous grade (IA). The microstructure of rubber samples under study were defined by Perkin Elmer IR- spectrometer Spectrum 100 with FTIR device being applied. Rubber compounds were prepared in two phases: the first one in rubber mixer RheoMix 3000 OS (Haake Thermo Scientific), the second one - by curing group injection at laboratory mills Sm 350 150/150 (Polymermash). Viscosity and Mooney stress relief were defined by Mooney viscometer MV 2000, rheometric properties were defined by device MDR 2000 (Alpha Technologies). Dynamic properties were also measured: tgδ at 60 ° С and Payne effect were defined by device RPA 2000 (Alpha Technologies), rebound resilience - by Shob pendulum. It is shown that properties of SKDN with oil MES and TDAE are similar to each other and to IA. However, SKDN with TDAE dominates SKDN with MES in terms of nominal strength at break and elongation of vulcanizates. SKDN containing both oils up to 20 wt.% insignificantly dominates IA in terms of dynamic properties, however it goes after IA in terms of strength at break. It may be led by different molecular weight characteristics of rubbers.