Novel elastomer‐dumbbell functionalized POSS composites: Thermomechanical and Morphological Properties

Abstract

Nanocomposites consisting of poly(styreneb-butadiene-b-styrene) (SBS) and polyhedral oligomeric silsesquioxanes (POSS) were prepared using a solvent dispersion method. Dumbbell-shaped POSS fillers were prepared using diacyl chlorides to bridge the POSS molecules. Infrared spectroscopy confirmed functionalization. Scanning electron microscopy revealed an increase in filler aggregation with concentration, with preferential phase selectivity. Polydispersity increased with filler concentration while d spacing was influenced by phase selectivity and domain-filler compatibility. Functionalized POSS improved thermal stability by imparting restrictions of SBS chain motions. Tensile stress-strain analysis revealed an increase in modulus, yield strength, and strain hardening with filler concentration, while creep deformation decreased and permanent strain increased with POSS content. Storage modulus, loss modulus, and glass transition temperature increased with filler content due to effective SBS-POSS interaction. Nanocomposite properties were influenced by filler concentration, the phase of the filler was dispersed throughout and the length of the alkyl ''barbell'' on the dumbbell-shaped POSS.

Segmental dynamics in hybrid polymer/POSS nanomaterials

“…A more extended study by the same group on the trisilanolphenyl system shows that an increase of T g is systematic with content up to 3wt% and that water uptake and proton conductivity in the hybrids is optimum for 2wt%. chains [217]. The inert vertex groups were either i-butyl or phenyl.…”

Novel phenyl‐POSS/polyurethane aqueous dispersions and their hybrid coatings

“…6 Furthermore, POSS containing bulky phenyl groups at their periphery usually have better thermal stability, whereas isobutyl-POSS have excellent radiation resistance. 7,8 Considering the structural diversity and functional versatility of R substituents, certain desired properties, such as improved thermal decomposition, glass-transition temperatures (T g ), and mechanical properties, can be achieved by incorporating various POSS into polymer matrices.…”

Creep and Recovery Behaviour of Polyolefin-Rubber Nanocomposites Developed for Additive Manufacturing

“…This is particularly important when the innovative functional polymeric materials incorporating nanomaterials are used in integrated systems such as automotive applications and the components are exposed to varying stresses over extended periods at elevated temperatures. Creep and recovery experiments present a sensitive means of assessing the dimensional stability of polymeric materials by understanding their viscoelastic deformation behaviour under constant stress and temperature [1][2][3][4].…”