| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Research Abstract |
Template polymerization of acrylamide (Aam) was found to proceed in the presence of poly(methyl methacrylate) (PMMA) as a template polymer which have carbonyl groups in its side chains. Especially, the stereoregular PMMA which was syndiotactic or isotactic rich was prepared by the anionic polymerization using an adequate initiator., Using the prepared PMMA the polymerization of AAm was performed in THF, and the triad tacticlty of the resulting poly(acrylamide) (PAAm) was determined by NMR. At the beginning of the polymerization (conversion<10%), both of the syndiotactic rich (n>73.8%) and isotactic rich (mm>98.6%) PMMA as template polymers were found to afford relatively high content of rr and mm sequences respectively. However, the stereoregularity of the resulting polymers tended to decrease with the progress of polymerization. Furthermore, the polymerizability of AAm in the presence of isotactic rich PMMA was found to be much lower than syndiotactic rich PMMA. Aiming the formation o
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f the strong interaction, the polymerization of AAm was carried out in the presence of poly (N-isopropylacrylamide) (PNIPAAm) which has amide groups in its side chains. Resultingly the transcription effect of the template polymer was found to increase in comparison with PMMA. Furthermore, several PNIPAAm templates having various molecular weights were prepared by the radical polymerization and subsequent fractionation, and the polymerization of AAm was also carried out in the presence of the resulting PNIPAAm templates in THF solvent. The polymerizability was remarkably affected by the molecular weight of the templates, that is, the increase of the molecular weight of PNIPAAm resulted in considerable decrease of the polymerizability. We have also investigated polymerization system because of its distinctive characters such as high polarity and viscosity. We have investigated the temperature effects in this polymerization and found that the LCST (Lower Critical Solution Temperature) of PNIPAAm as a template polymer concerns the polymeriability of AAm. Expecially, the polymerizability of AAm in the presence of PNIPAAm was found to be lower at the polymerization temperature below the LCST. Less
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