Preparation and Characterization of Graft Copolymers of Methyl Methacrylate and Poly(n-hexyl isocyanate) Macromonomers
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Living poly(n-hexyl isocyanate) (PHIC) was deactivated with methacryloyl chloride toproduce methacryl-terminated poly(n-hexyl isocyanate) (PHIC-MA) rodlike macromonomers.Radical copolymerization of methyl methacrylate (MMA) with PHIC-MA was performedusing 2, 2'-azobis(isobutyronitrile) as an initiator in benzene at 60°C to prepare poly(methylmethacrylate)-graft-poly(n-hexyl isocyanate) (PMMA-graft-PHIC) graft copolymers. Themonomer reactivity ratios of MMA (M1) and PHIC-MA (M2) were evaluated as r1 = 11.5 andr2 = ~ 0, exhibiting remarkably lower reactivity of PHIC-MA macromonomer than that ofcommon macromonomers. The resultant graft copolymers were characterized using gelpermeation chromatography equipped with low-angle laser light-scattering to determine themolecular weights, and equipped with a refractive index detector and an ultraviolet lightdetector to estimate a PHIC weight fraction of PMMA-graft-PHIC at the ith elution volumeof the GPC chromatogram. There are 2-3 PHIC grafts per PMMA molecule, and the PHICrodlike chains might be difficult to introduce into the PMMA main chains having highermolecular weights. A specific dimension of PMMA-graft-PHIC in solution was discussedin detail.
- Elsevier Ltdの論文
- 2004-01-00
Elsevier Ltd | 論文
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