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A novel poly[2]catenane having rigid triazole rings between [2]catenane moieties was synthesized by the 1,3-dipolar cycloaddition of diazido[2]catenane with 4,4′-diethynylbiphenyl. The reaction proceeded effectively under mild conditions and gave a polymer in high yield. The number average molecular weight (M n ) of the polymers was 1.5 × 10 4 –2.5 × 10 4 . A cyclic dimer consisting...
Isotactic polypropylene (iPP)–polystyrene (PS) and iPP–poly(methyl methacrylate) (PMMA) multiblock copolymers were synthesized by atom transfer radical coupling (ATRC) of PS–iPP–PS and PMMA–iPP–PMMA triblock copolymers obtained by atom transfer radical polymerization (ATRP) of styrene (St) and methyl methacrylate (MMA), respectively, using α,ω-dibromoisobutyrateoligopropylene (iPP–Br) as a bifunctional...
In order to obtain thermoplastic (before curing) and thermosetting (after curing) polyimides with high T g for adhesive film, we prepared novel polyimides having phenylethynyl group in the side chain (44% of concentration of curing group) from asymmetric 2,3,3′,4′-biphenyltetracarboxylic dianhydride (a-BPDA), 3,4′-oxydianiline (3,4′-ODA) or 1,3-bis(4-aminophenoxy)benzene (1,3,4-APB) or 1,3-bis(3-aminophenoxy)benzene...
PVA/WO 3 hybrids were produced by using ion exchange process of Na 2 WO 4 ·2H 2 O. Microstructures of this hybrid was estimated by SAXS measurement as follows; the WO 3 rich domains having radius of gyration of about 5.7 nm (estimated in Guinier regime), in which PVA chains were partly incorporated, were dispersed evenly in PVA matrix with the correlation length...
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