Abstract
Synthesis and anionic polymerization of silacyclopropane derivatives, 2-n-butyl-1-sec-butyl-1-tert-butylsilacyclopropane (1s1t2n-BuSP) and 2-n-butyl-1-tert-butyl-1-isobutylsilacyclopropane (1i1t2n-BuSP), were investigated. These monomers were prepared by treatment of sec-butyl-tert-butyldichlorosilane or tert-butylisobutyldichlorosilane with lithium in the presence of 1-hexene. Monomers 1s1t2n-BuSP and 1i1t2n-BuSP could be polymerized with a butyllithium initiator in THF at −78 °C in the presence of hexamethylphosphoramide (HMPA). After precipitation in methanol, poly(2-n-butyl-1-sec-butyl-1-tert-butylsilacyclopropane) (poly(1s1t2n-BuSP)) (Mn = 2100, Mw/Mn = 1.53, relative to a polystyrene standard) and poly(2-n-butyl-1-tert-butyl-1-isobutylsilacyclopropane) (poly(1i1t2n-BuSP)) (Mn = 1800, Mw/Mn = 1.60) were obtained. Contact angles of water with poly(1s1t2n-BuSP) and poly(1i1t2n-BuSP) were determined as 103 and 102°, respectively. This significantly high hydrophobicity is probably due to the unusually la...
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