Mechanical properties and thermal aging behavior of styrene‐butadiene rubbers vulcanized using liquid diene polymers as the plasticizer

Abstract

The mechanical properties of styrene-butadiene rubber (SBR) vulcanizates prepared using various plasticizers including liquid polybutadiene and styrene-butadiene copolymers were investigated. The effect of the liquid polymers as the plasticizers on the mechanical properties of the polymers, such as the hardness, tensile storage modulus, tand, and the modulus at 100% elongation values, were determined before and after the thermal aging. As a result, it was revealed that the use of these liquid polymers gave less amount of change in the measurement values for the mechanical properties during the aging. The crosslinking density and the amount of free polymers were also determined on the basis of the swelling and extraction data, respectively, using several organic solvents. These results support the fact that the added liquid polymers are fixed to the SBR networks. We revealed the superiority of the liquid styrene-butadiene copolymers as the plasticizer, which provides sufficient mechanical properties after vulcanization and the excellent maintenance of the properties during the thermal aging process.

Effects of Molecular Weight of Functionalized Liquid Butadiene Rubber as a Processing Aid on the Properties of SSBR/Silica Compounds

“…The extraction amounts of N-5 and C-5 were the lowest among all compounds. This is because it is more advantageous for the crosslinking reaction with the base polymer when the molecular weight of LqBR is larger [ 8 ].…”

“…In fact, the use of DAE oils is prohibited in tire manufacturing, and oils with a low PAH content, such as treated distillate aromatic extract (TDAE) oil, are being used as alternative processing aids in accordance with European Registration, Evaluation, Authorization and Restriction of Chemicals (EU REACH) regulations in 2010 [ 6 , 7 ]. However, TDAE oil-applied vulcanizates have a disadvantage in that compound properties are degraded over time due to the migration of TDAE oil [ 8 , 9 ]. These challenges suggested the need for a new, non-PAH processing aid with low glass transition temperature (T g ) and no migration.…”

Lubrication and plasticization behavior of large-size micro-spherical structured SiO2 for natural rubber

“…Usually, the mechanical property of a plasticized rubber is drastically destroyed. [23][24][25][26] Keeping this fact into consideration, the results are analyzed. Flex fatigue property of composites is mainly considered.…”

“…However, because of the diffusion of the low-molecularweight oily plasticizers in the rubber matrix, these oil-plasticized rubber compounds are subjected to the oozing of oil to the rubber surface and the evaporation of oil at elevated temperatures, leading to the decrease of the mechanical properties over time, especially for stiffness and ex fatigue property. [23][24][25][26] What is worse, they oen migrate or volatilize from polymer matrix due to the low-molecular-weight leading to serious environmental pollutions. 25 Then much attention has been focused on the research of polymeric plasticizers in recent years.…”

“…[23][24][25][26] What is worse, they oen migrate or volatilize from polymer matrix due to the low-molecular-weight leading to serious environmental pollutions. 25 Then much attention has been focused on the research of polymeric plasticizers in recent years. 27,28 The miscibility of the polymeric plasticizers and rubber composite is important for maintaining the physical properties during the thermal aging process.…”