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- W1998658189 abstract "Long-chain heteroatom-containing telechelic diols with 29-32 atoms in the backbone were synthesized by a one-step, free-radical tetomerization of 10-undecene-1-ol with commercially available α,ω-dithiols. The oxygen and sulfur atoms caused a decrease in the melting point and enthalpy of the diols, compared to the corresponding purely aliphatic diols. The heteroatom-containg α,ω-diols HO-(CH 2 ) 11 -S-(CH 2 ) 2 -X-(CH 2 ) 2 -S-(CH 2 ) 11 -OH, where X = CH 2 , O, or O-(CH 2 ) 2 -O, were reacted in the melt with 1,6-diisocyanatohexane O=C=N-(CH 2 ) 6 -N=C=O, producing a series of polyurethanes containing an increasing amount of heteroatoms. Characterization by differential scanning calorimetry, infra-red spectroscopy, thermogravimetric analysis, and wide angle x-ray scattering of the m,n-polyurethane series showed that, like the teletechic diols they were synthesized from, the heteroatoms caused a decrease in the melting point and enthalpy. Howeve, they did not affect either the decomposition temperature or the crystal structure/packing." @default.
- W1998658189 created "2016-06-24" @default.
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- W1998658189 date "2003-05-01" @default.
- W1998658189 modified "2023-09-25" @default.
- W1998658189 title "Macromolecular Crystal Engineering Based on Segmented Polymers: Influence of Heteroatoms on the Thermal Properties and Crystallization of m,n-Polyurethanes Derived from Long-Chain, Heteroatom-Containing, Monodisperse ,-Diols" @default.
- W1998658189 doi "https://doi.org/10.1002/macp.200390071" @default.
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