Dynamic mechanical properties in blends of poly(styrene‐b‐isoprene‐b‐styrene) with aromatic hydrocarbon resin

Abstract

The damping properties in blends of poly (styrene-b-isoprene-b-styrene) (SIS) and hydrogenated aromatic hydrocarbon (C 9 ) resin were investigated by dynamic mechanical analysis. SIS exhibited two independent peaks of loss factor (tan d) corresponding to the glass transition of polyisoprene (PI) and polystyrene (PS) segments, respectively. The addition of hydrogenated C 9 resin had a positive impact on the damping of SIS. With the increasing softening point and content of the resin, the main tan d peak shifted to higher temperatures and the useful damping temperature range was broadened. Addition of mica or PS was found to widen the effective damping range evidently in the high-temperature region, especially when PS was mixed in the solid state. It was concluded that the dispersed PS domains played a role of reinforcing fillers at low temperatures and served as a polymer component with a tan d peak due to its glass transition at the high temperature.

Living anionic polymerization of 4‐diphenylphosphino styrene for ABC triblock copolymers

“…Increasing the concentration of hard domains enhanced physical reinforcement and increased the corresponding Young's moduli and stress at break. These trending mechanical properties agree with previous literature studies involving conventional poly(S‐ b ‐I‐ b ‐S) thermoplastic elastomers …”

“…The rubbery plateau extended for approximately 120 o C with a flow temperature above 100 o C, allowing a wide modulus‐invariant temperature range for the novel triblock copolymers. Previous literature on traditional poly(S‐ b ‐I‐ b ‐S) thermoplastic elastomers details comparable thermomechanical properties and operational temperature windows . The miscibility of styrenic components in poly(S‐ b ‐I‐ b ‐DPPS) triblock copolymers advantageously affords viscoelastic properties in agreement with conventional ABA‐type thermoplastic elastomers.…”

Composition-properties relationship in epoxidized trans-1,4-polyisoprene obtained by heterogeneous method

“…The tan δ peak at 40-100°C of sample 1 was widen and smooth indicating widen damping temperature, which was suitable for damping mate rials. Although the height of tan δ peak was not enough for damping material requirements, many researches reported the ways to increase the peak height [18][19][20].…”

Epoxidation of styrene-isoprene-styrene block copolymer and research on its reaction mechanism

“…Due to 15% content of polystyrene in SIS and ESIS, the peak value of polystyrene tgδ is low, and the peaks of tgδ are covered up by the whole flow of the system and difficult to be distinguished [19] . However, from tgδ-T curves in Fig.3, we can see that there is an evident loss peak appeared at -45.3 ℃ which is caused by the glass transition of polyisoprene chains in SIS block copolymer, corresponding to the descendant module step in E -' T curves.…”