Studies of thermal, mechanical properties, and kinetic cure reaction of carboxyl‐terminated polybutadiene acrylonitrile liquid rubber with diepoxy octane

• Published in: Journal of applied polymer science Vol. 138; no. 9
• Main Authors: Ebrahimabadi, Yahya, Mehrshad, Mohammad, Mokhtary, Masoud, Abdollahi, Mahdi
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 05.03.2021; Wiley Subscription Services, Inc
• Subjects: Acrylonitrile butadiene resins; Catalysts; Copolymers; Curing; differential scanning calorimetry; Elongation; Epoxy resins; Fracture toughness; glass transition; Glass transition temperature; kinetics; Materials science; Mechanical properties; Physical properties; Polybutadiene; Polymers; Sedimentation; thermal properties
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.49932

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 (Ea), 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, the Ea values are in the range of 91.3–97.1 kJ.mol−1 and the A values are in the range of 0.48 × 1011–1.51 × 1011 S−1.