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- W2000930179 abstract "Cyclic poly(dimethylsiloxane) (PDMS) was prepared from commercially available linear α,ω-dihydroxy-PDMS by a platinum-catalyzed dehydrocoupling of its chain ends with α,ω-dihydrido-PDMS in dilute solution. Ring closing was verified by MALDI-ToF mass spectrometry along with GPC, IR, 1H and 29Si NMR spectroscopy. Purification of the cyclic PDMS was achieved by inclusion complexation of linear byproducts with γ-cyclodextrin. Cyclic yields are ≥ 50% and the average molecular weight (M) closely reflects that of the linear starting material. Yields of large cycles, [(CH3)2SiO]x where x > 6, are greater than those achieved by the traditional ring-chain equilibration route beginning with [(CH3)2SiO]4 and [(CH3)2SiO]5 [1], and the M is greater than that obtained for the cyclic product obtained from base-catalyzed cyclodepolymerization of the same α,ω-dihydroxy-PDMS precursor [2]." @default.
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- W2000930179 date "2010-05-01" @default.
- W2000930179 modified "2023-10-18" @default.
- W2000930179 title "Cyclic poly(dimethylsiloxane) via ring-closing dehydrocoupling of α,ω-dihydroxy-PDMS with α,ω-dihydrido-PDMS in dilute solution" @default.
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- W2000930179 doi "https://doi.org/10.1016/j.polymer.2010.04.006" @default.
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