Matches in SemOpenAlex for { <https://semopenalex.org/work/W2056043188> ?p ?o ?g. }
Showing items 1 to 92 of
92
with 100 items per page.
- W2056043188 endingPage "2780" @default.
- W2056043188 startingPage "2770" @default.
- W2056043188 abstract "The design, synthesis, and properties of two new types of poly(borosiloxane) preceramic polymers, diethylborazine- (PVS−DEB) and pinacolborane-modified (PVS−PIN) poly(vinylsiloxane)s, are reported. The polymers are synthesized in excellent yields by the RhH(CO)(PPh3)3-catalyzed reactions of poly(vinylsiloxane) (PVS) with either diethylborazine (DEB−H) or pinacolborane (PIN−H). The spectroscopic data for the polymers, along with results of the RhH(CO)(PPh3)3-catalyzed hydroboration reactions of diethylborazine and pinacolborane with the model compound vinyltris(trimethylsiloxy)silane, are consistent with predominately anti-Markovnikov hydroboration of the polymer vinyl groups by the boranes. The degree of polymer hydroboration is simply controlled by varying the reactant ratios with the compositions of the PVS−DEB polymer ranging from (MeSiO1.5)0.42(PhSiO1.5)0.37(ViMe2SiO0.5)0.17(DEB(CH2)2Me2SiO0.5)0.04 to (MeSiO1.5)0.42(PhSiO1.5)0.37(DEB(CH2)2Me2SiO0.5)0.21 and those of the PVS−PIN polymers from (MeSiO1.5)0.42(PhSiO1.5)0.37(ViMe2SiO0.5)0.18(PIN(CH2)2Me2SiO0.5)0.03 to (MeSiO1.5)0.42(PhSiO1.5)0.37(PIN(CH2)2Me2SiO0.5)0.21. The borane-modified polymers are soluble and stable in ethers, acetone, methylene chloride, benzene, and pentane. Molecular weight analyses using SEC with refractive index, viscometry, and light-scattering triple detection show significant differences in hydrodynamic volume, molecular weight, radius of gyration, and conformation, which indicate that the PVS−PIN and PVS−DEB polymers adopt a more branched and spherical structure compared to the unmodified PVS. Bulk pyrolysis of the modified resins produced SiOCB ceramic chars with boron contents ranging from 0.3 to 0.7% depending upon the percentage of polymer modification. XRD and TEM studies of the 1800 °C chars of PVS and PVS−PIN showed significant differences in the degree of grain growth and distribution with the boron-modified char showing both a smaller average crystallite size and a more narrow size range. The PVS−PIN polymers were found to be excellent melt-processable, single-source precursors to small-diameter SiOCB fibers." @default.
- W2056043188 created "2016-06-24" @default.
- W2056043188 creator A5005132780 @default.
- W2056043188 creator A5041758178 @default.
- W2056043188 creator A5042084875 @default.
- W2056043188 creator A5081765995 @default.
- W2056043188 creator A5086747400 @default.
- W2056043188 date "2000-08-25" @default.
- W2056043188 modified "2023-09-26" @default.
- W2056043188 title "Synthesis and Ceramic Conversion Reactions of Pinacolborane- and Diethylborazine-Modified Poly(vinylsiloxane)s. The Development of a Processable Single-Source Polymeric Precursor to Boron-Modified Silicon Carbide" @default.
- W2056043188 cites W1479855267 @default.
- W2056043188 cites W1558752408 @default.
- W2056043188 cites W1596146737 @default.
- W2056043188 cites W1971718463 @default.
- W2056043188 cites W1973665179 @default.
- W2056043188 cites W1980796929 @default.
- W2056043188 cites W1985379343 @default.
- W2056043188 cites W1989923303 @default.
- W2056043188 cites W1999531045 @default.
- W2056043188 cites W2005608077 @default.
- W2056043188 cites W2027934678 @default.
- W2056043188 cites W2040564286 @default.
- W2056043188 cites W2047960425 @default.
- W2056043188 cites W2061425239 @default.
- W2056043188 cites W2061937278 @default.
- W2056043188 cites W2079429103 @default.
- W2056043188 cites W2082485977 @default.
- W2056043188 cites W2082716360 @default.
- W2056043188 cites W2094610843 @default.
- W2056043188 cites W2130245156 @default.
- W2056043188 cites W2950688621 @default.
- W2056043188 cites W3048513532 @default.
- W2056043188 doi "https://doi.org/10.1021/cm000317y" @default.
- W2056043188 hasPublicationYear "2000" @default.
- W2056043188 type Work @default.
- W2056043188 sameAs 2056043188 @default.
- W2056043188 citedByCount "25" @default.
- W2056043188 countsByYear W20560431882012 @default.
- W2056043188 countsByYear W20560431882014 @default.
- W2056043188 countsByYear W20560431882015 @default.
- W2056043188 countsByYear W20560431882018 @default.
- W2056043188 countsByYear W20560431882021 @default.
- W2056043188 countsByYear W20560431882023 @default.
- W2056043188 crossrefType "journal-article" @default.
- W2056043188 hasAuthorship W2056043188A5005132780 @default.
- W2056043188 hasAuthorship W2056043188A5041758178 @default.
- W2056043188 hasAuthorship W2056043188A5042084875 @default.
- W2056043188 hasAuthorship W2056043188A5081765995 @default.
- W2056043188 hasAuthorship W2056043188A5086747400 @default.
- W2056043188 hasConcept C161790260 @default.
- W2056043188 hasConcept C168568712 @default.
- W2056043188 hasConcept C178790620 @default.
- W2056043188 hasConcept C185592680 @default.
- W2056043188 hasConcept C188027245 @default.
- W2056043188 hasConcept C192562407 @default.
- W2056043188 hasConcept C196306401 @default.
- W2056043188 hasConcept C2778826510 @default.
- W2056043188 hasConcept C2779342513 @default.
- W2056043188 hasConcept C2780407432 @default.
- W2056043188 hasConcept C521977710 @default.
- W2056043188 hasConceptScore W2056043188C161790260 @default.
- W2056043188 hasConceptScore W2056043188C168568712 @default.
- W2056043188 hasConceptScore W2056043188C178790620 @default.
- W2056043188 hasConceptScore W2056043188C185592680 @default.
- W2056043188 hasConceptScore W2056043188C188027245 @default.
- W2056043188 hasConceptScore W2056043188C192562407 @default.
- W2056043188 hasConceptScore W2056043188C196306401 @default.
- W2056043188 hasConceptScore W2056043188C2778826510 @default.
- W2056043188 hasConceptScore W2056043188C2779342513 @default.
- W2056043188 hasConceptScore W2056043188C2780407432 @default.
- W2056043188 hasConceptScore W2056043188C521977710 @default.
- W2056043188 hasIssue "9" @default.
- W2056043188 hasLocation W20560431881 @default.
- W2056043188 hasOpenAccess W2056043188 @default.
- W2056043188 hasPrimaryLocation W20560431881 @default.
- W2056043188 hasRelatedWork W1993045656 @default.
- W2056043188 hasRelatedWork W1994047372 @default.
- W2056043188 hasRelatedWork W2033227064 @default.
- W2056043188 hasRelatedWork W2051128662 @default.
- W2056043188 hasRelatedWork W2078250691 @default.
- W2056043188 hasRelatedWork W2131789404 @default.
- W2056043188 hasRelatedWork W2155690204 @default.
- W2056043188 hasRelatedWork W2277622009 @default.
- W2056043188 hasRelatedWork W2943126429 @default.
- W2056043188 hasRelatedWork W2950914403 @default.
- W2056043188 hasVolume "12" @default.
- W2056043188 isParatext "false" @default.
- W2056043188 isRetracted "false" @default.
- W2056043188 magId "2056043188" @default.
- W2056043188 workType "article" @default.