Alkoxysilane functionalized poly(butadiene-co-styrene) elastomers were prepared by terminating the anionic polymerization with tetraethylorthosilicate (TEOS). The isolated product contained 60 % to 70 % coupled polymer. A facile method for characterizing the type of coupling was developed using tetrabutylammonium fluoride as the decoupling agent. Analysis showed > 95 % of the coupled product was from condensation of the alkoxysilane endgroups during workup and only 3 % was due to two polymeric lithium chains reacting with one TEOS molecule. The alkoxysilane functionalized elastomers continued to increase in viscosity with storage. Neutralization of the polymer solution with 2-ethylhexanoic acid or addition of sterically hindered alcohols was able to reduce the coupling and viscosity increase. The alkoxysilane functionalized polymer improved hysteresis and wear compared to a similar non-functional polymer in silica containing tire tread applications.
The role of functional polymers in improving tire performance
2009
13 Seiten, 3 Bilder, 3 Tabellen, 37 Quellen
Aufsatz (Konferenz)
Englisch
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