"Preparation and properties of carboxyl-modified 1，2-polybutadiene with widely adjustable functionality"

Abstract

Carboxyl-modified 1,2-polybutadiene (1,2-PB) was prepared by photoinitiation thiol olefin click chemistry method at room temperature. The results showed that 3-mercaptopropionic acid was successfully grafted onto 1,2-PB, and the carboxyl functionality was adjustable in a wide range of 0~46.2%. And the intensity of hydrogen bond could be controlled by adjusting the content of carboxyl group on the molecular chain, so that the glass transition temperature of the polymer could be increased from -2.1 ℃ to 26.3 ℃. The tensile strength of the unfilled rubber could reach 15.5 MPa, and the elongation at break was more than 350%. The effective damping temperature range of the material was widened from -8.28-3.83 ℃ to 23.63-73.03 ℃. The high carboxyl grafting rate in 1,2-PB/COOH endowed the material with excellent metal adhesion, and the remaining double bonds in the molecular chain could also be co-vulcanized with the butadiene styrene rubber matrix, which made it had excellent adhesion with the rubber layer.