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- W2081279512 abstract "Medium to high molecular weight random copolymers of 1,5-dioxepan-2-one (DXO) and L-lactide (L-LA) or ε-caprolactone (ε-CL) of different compositions have been investigated. Polymerization was conducted in bulk at 110°C using stannous 2-ethylhexanoate as catalyst. Poly(DXO-co-L-LA) is a hydrolysable material with a glass transition temperature (Tg) ranging from −36 up to 58°C depending on the molar composition. The material exhibited crystallinity as long as the amount of DXO did not exceed 50 weight%. Reactivity ratios were determined to rL-LA=10 and rDXO=0.1, giving a more blocky structure than expected in a random copolymer. The copolymer between ε-CL and DXO was shown to be a truly random copolymer by 13C NMR, as expected from the reactivity ratios, rDXO=1.6 and rε-CL=0.6. Tg of the material was ranging from −64 up to −39°C. The ability of the poly(DXO-co-ε-CL) to crystallize was retained up to a DXO content of 40 weight%. The melting temperature and crystallinity of both copolymers decrease with increasing amount of DXO. Incorporation of semicrystalline comonomers, L-LA or ε-CL, into the amorphous poly(DXO) creates materials with adjustable properties depending on the molar composition." @default.
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- W2081279512 date "1998-04-01" @default.
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- W2081279512 title "Ring-opening polymerization of degradable polyesters" @default.
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- W2081279512 doi "https://doi.org/10.1002/masy.19981300131" @default.
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