Abstract: Chloropropyl heptaisobutyl polyhedral oligomeric silsesquioxane (Cl-POSS) end-functionalized polybutadiene (PB-POSS) has been synthesized using Cl-POSS as terminator through a living anionic polymerization process. Subsequently a series of PB-POSS composites filled with silica (SiO2) were prepared by solvent method. The effect of the molecular weight of PB-POSS, the content of silica and the content of Si69 coupling agent on the bound rubber content of PB-POSS were investigated. The results showed that the bound rubber content of all PB-POSS samples were much higher than that of PB. When the molecular weight of PB-POSS, the content of silica and the content of Si69 coupling agent were 50 000,50 phr and 2.5 phr, respectively, the bound rubber content reached the maximum value of 17.50%, more than twice as that of the pure PB. The interaction mechanism between PB-POSS and silica was studied by FTIR confirmed obvious red shift of the absorption peaks of Si-OH bond and significant increment of Si-OH absorption peak intensity, with increasing silica or Si69 content. Both of the red shift and the intensity increment can be considered to be coincide with increasing bound rubber content, thus demonstrating that there exists strong hydrogen bonding interaction between silica and PB-POSS.
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2019, Vol. 33 
