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- W1993509719 abstract "Well-defined poly(vinylferrocene)s with predictable molecular weights and low polydispersities were prepared by living anionic polymerization of vinylferrocene initiated with nBuLi in tetrahydrofuran (THF) at −28 °C as well as 0 °C. The living poly(vinylferrocenyl)lithium (PVFcLi) was first employed in coupling reactions with haloallyl chain-end functionalized polyisobutylene (PIB) series. By using bromoallyl chain-end functionalized PIB, the coupling proceeded in THF at 0 °C to afford a new AB diblock copolymer comprised of PIB and PVFc segments with high coupling efficiency (∼85%) limited by undesired lithium-halogen exchange. The synthesis of an ABA triblock copolymer, PVFc-b-PIB-b-PVFc, was also attempted by coupling of α,ω-bromoallyl difunctionalized PIB and PVFcLi; however, lithium-halogen exchange yielded a significant amount of byproducts. In contrast, PIB-b-PVFc and PVFc-b-PIB-b-PVFc with excellent coupling efficiencies (>94%) could be successfully synthesized by using chlorosilyl chain-end functionalized PIB in coupling reactions with PVFcLi. The polymers were characterized by gel permeation chromatography (GPC)−multiangle laser light scattering (MALLS) and proton nuclear magnetic resonance (1H NMR) analyses. The differential scanning calorimetry (DSC) thermogram of PVFc-b-PIB-b-PVFc showed two glass transition temperatures at −65 and 198 °C, suggesting microphase-separated morphology. Transmission electron microscopy (TEM) corroborated the typical disordered spherical morphology of a PVFc-b-PIB-b-PVFc thin film. The stress−strain plot of a solution cast sample of PVFc-b-PIB-b-PVFc showed typical elastomeric property." @default.
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- W1993509719 date "2007-09-13" @default.
- W1993509719 modified "2023-10-14" @default.
- W1993509719 title "Synthesis of Novel Block Copolymers Comprised of Polyisobutylene and Poly(vinylferrocene) Segments" @default.
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- W1993509719 doi "https://doi.org/10.1021/ma070903d" @default.
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