Studies of thermal, mechanical properties, and kinetic cure reaction ofcarboxyl-terminatedpolybutadiene acrylonitrile liquid rubber with diepoxy octane

Epoxy resins, despite their unique properties, have limitations in many applications due to their low fracture toughness. One of the most effective methods to overcome this limitation is to use toughening agents, such as carboxyl terminated poly butadiene-acrylonitrile (CTBN) in the epoxy matrix. CTBN can react with various compounds, such as epoxies. In this study, we investigated the severity of CTBN sedimentation with di epoxy octane (DEO) in the presence basis catalysts. The studied of the physical properties of the synthesized copolymer in the presence of pyridine compared to other catalysts increases mechanical properties (248.43% elongation, 0.63 MPa strength, and 32 hardness with Shore A) and decreases the glass transition temperature (-45.1) of the copolymer. Investigated the cure kinetics of the CTBN-DEO reaction was in the presence of pyridine using a nonisothermal technique of differential scanning calorimetry, and the curing kinetic parameters, such as activation energy (E-a), pre-exponential factor (A), and rate constant (k), were calculated by different kinetic methods. The obtained curing kinetic values with different kinetic methods are well-matched, theE(a)values are in the range of 91.3-97.1 kJ.mol(-1)and theAvalues are in the range of 0.48 x 10(11)-1.51 x 10(11) S-1.

Automated summary

This study examines the sedimentation severity of CTBN with DEO in the presence of basic catalysts in epoxy resins, as well as the physical properties and curing kinetics of copolymer materials synthesized with pyridine as a catalyst. The results show an improvement in mechanical properties and a decrease in glass transition temperature of the copolymer when pyridine is used as a catalyst, with consistent curing kinetic values obtained through different methods.