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The polymerization of a novel monomer p-(t-butyldimethylsiloxy)tolan (1) with TaCl 5 –n-Bu 4 Sn provided a high molecular weight polymer (poly(1)), whose M w reached 4.0×10 6 . The poly(1) membrane was prepared by the casting method, and converted into poly[(p-hydroxy)tolan] (poly(2)) with a mixture of trifluoroacetic acid/water. Whereas poly(1) dissolved in low polarity...
SummaryPolymerization of isoprene was investigated by using a novel ternary catalyst system composed of neodymium(III) isopropoxide (Nd(OiPr)3), dimethylphenylammonium tetrakis(pentafluorophenyl)borate ([HNMe2Ph]+[B(C6F5)4]-; borate), and triisobutylaluminum (i-Bu3Al). The mole ratios of borate and aluminum compounds to Nd catalyst significantly affected the polymerization behavior. Both yield and...
SummaryCyclopolymerization of amino acid-derived novel dipropargyl ester and dipropargylamide was carried out using a rhodium catalyst. Polymers with cyclized structures were obtained under certain conditions. The dipropargylamide polymer exhibited a large specific rotation and an intense Cotton effect around 300 nm based on the chiral higher order structure. It adsorbed N-benzyloxycarbonyl-L-alanine...
The stability of several poly(N-propargylamides) was investigated in solution and in solid state on the basis of molecular weight change with time, and further their thermal stability was investigated by TGA. When the stability of poly(N-propargylamides) with varying pendent groups was compared, polymers with pendent groups of moderate size showed the highest stability in solution. Too short and too...
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