OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS

A series of new poly(siloxane) and poly(silazane) derivates were synthesized by cationic ring opening mass copolymerization of the cyclic monomers octamethylcyclotetrasiloxane and hexamethylcyclotrisilazane, obtaining poly[(dimethylsiloxane)-co-(dimethylsilazane) ] copolymers with different concentr...

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Autores principales: RODRÍGUEZ-BAEZA,MARIO, TRUJICHETT BRITO,MARÍA JOSÉ
Lenguaje:English
Publicado: Sociedad Chilena de Química 2006
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000200015
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spelling oai:scielo:S0717-970720060002000152006-06-30OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORSRODRÍGUEZ-BAEZA,MARIOTRUJICHETT BRITO,MARÍA JOSÉ Poly[(dimethylsiloxane)-co-(dimethylsilazane) ] copolymers thermal cured pyrolysis ceramic powder morphology A series of new poly(siloxane) and poly(silazane) derivates were synthesized by cationic ring opening mass copolymerization of the cyclic monomers octamethylcyclotetrasiloxane and hexamethylcyclotrisilazane, obtaining poly[(dimethylsiloxane)-co-(dimethylsilazane) ] copolymers with different concentrations of the comonomer units. The molar masses of the soluble fractions of the copolymers and of the macrocycles generated in the copolymerization reaction medium, were determined by gel permeation chromatography. Thermogravimetric analysis shows that poly(dimethylsiloxane) is more stable than the copolymers and the homopolymer poly(dimethylsilazane). Differential scanning calorimetry of poly(dimethylsilazane) presents a melting endotherm, indicating that this homopolymer is crystalline. The copolymers were characterized by FT-IR and ¹H and 13C NMR spectroscopy.. The polymers were thermally cured and pyrolysed, obtaining ceramic powder. The morphology of the ceramic powder, studied by scanning electronic microscopy, corresponds to highly uniform spherical particles. The ceramic material was characterized by FT-IR. It was shown that these cyclic monomers copolymerize and that they constitute pre-polymer precursors of the powdered ceramic material since the products have Si, C, N and O atomsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.51 n.2 20062006-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000200015en10.4067/S0717-97072006000200015
institution Scielo Chile
collection Scielo Chile
language English
topic Poly[(dimethylsiloxane)-co-(dimethylsilazane) ] copolymers
thermal cured
pyrolysis
ceramic powder
morphology
spellingShingle Poly[(dimethylsiloxane)-co-(dimethylsilazane) ] copolymers
thermal cured
pyrolysis
ceramic powder
morphology
RODRÍGUEZ-BAEZA,MARIO
TRUJICHETT BRITO,MARÍA JOSÉ
OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS
description A series of new poly(siloxane) and poly(silazane) derivates were synthesized by cationic ring opening mass copolymerization of the cyclic monomers octamethylcyclotetrasiloxane and hexamethylcyclotrisilazane, obtaining poly[(dimethylsiloxane)-co-(dimethylsilazane) ] copolymers with different concentrations of the comonomer units. The molar masses of the soluble fractions of the copolymers and of the macrocycles generated in the copolymerization reaction medium, were determined by gel permeation chromatography. Thermogravimetric analysis shows that poly(dimethylsiloxane) is more stable than the copolymers and the homopolymer poly(dimethylsilazane). Differential scanning calorimetry of poly(dimethylsilazane) presents a melting endotherm, indicating that this homopolymer is crystalline. The copolymers were characterized by FT-IR and ¹H and 13C NMR spectroscopy.. The polymers were thermally cured and pyrolysed, obtaining ceramic powder. The morphology of the ceramic powder, studied by scanning electronic microscopy, corresponds to highly uniform spherical particles. The ceramic material was characterized by FT-IR. It was shown that these cyclic monomers copolymerize and that they constitute pre-polymer precursors of the powdered ceramic material since the products have Si, C, N and O atoms
author RODRÍGUEZ-BAEZA,MARIO
TRUJICHETT BRITO,MARÍA JOSÉ
author_facet RODRÍGUEZ-BAEZA,MARIO
TRUJICHETT BRITO,MARÍA JOSÉ
author_sort RODRÍGUEZ-BAEZA,MARIO
title OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS
title_short OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS
title_full OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS
title_fullStr OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS
title_full_unstemmed OBTENTION OF POWDERED CERAMIC MATERIAL BY PYROLYSIS OF POLY [(DIMETHYLSILOXANE)-CO-(DIMETHYLSILAZANE)] COPOLYMERS AS PRECURSORS
title_sort obtention of powdered ceramic material by pyrolysis of poly [(dimethylsiloxane)-co-(dimethylsilazane)] copolymers as precursors
publisher Sociedad Chilena de Química
publishDate 2006
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000200015
work_keys_str_mv AT rodriguezbaezamario obtentionofpowderedceramicmaterialbypyrolysisofpolydimethylsiloxanecodimethylsilazanecopolymersasprecursors
AT trujichettbritomariajose obtentionofpowderedceramicmaterialbypyrolysisofpolydimethylsiloxanecodimethylsilazanecopolymersasprecursors
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