Oxidation of Poly[bis(4-methylphenoxy)phosphazene] Surfaces and Chemistry of the Surface Carboxylic Acid Groups

Harry R. Allcock; Richard J. Fitzpatrick; Lawrence Salvati

doi:10.1021/cm00022a006

Oxidation of Poly[bis(4-methylphenoxy)phosphazene] Surfaces and Chemistry of the Surface Carboxylic Acid Groups

Harry R. Allcock, Richard J. Fitzpatrick, Lawrence Salvati

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33 Scopus citations

Abstract

Surfaces of poly[bis(4-methylphenoxy)phosphazene], [NP(OC₆H₄CH₃)₂]_n, were oxidized with an aqueous KMnO₄/NaOH solution, analyzed, and used as substrates for surface reactions. The small-molecule cyclic trimer, [NP(OC₆H₄CH₃)₂]₃, was also oxidized as a model system. Analysis of the small-molecule reactions by solution state ¹³C, ³¹P, and ¹H NMR spectroscopy and mass spectrometry confirmed that the methyl groups were oxidized to carboxylate groups. The oxidized polymer film surfaces were examined by contact angle measurements, ATR-IR, SEM, TEM, and XPS methods. The maximum depth of oxidation was 1 µm. Relationships between the reaction parameters, percent oxidation, and the contact angle have been established. The oxidized surfaces were also examined for cation exchange capability. Carboxylic acid surface units were reduced to benzylic alcohol groups. In addition, various coupling reactions were used to link 4-nitrofuroic acid and the tetrapeptide, Arg-Gly-Asp-Ser, to the polymer surfaces.

Original language	English (US)
Pages (from-to)	769-775
Number of pages	7
Journal	Chemistry of Materials
Volume	4
Issue number	4
DOIs	https://doi.org/10.1021/cm00022a006
State	Published - Feb 1 1992

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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10.1021/cm00022a006

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@article{2cbf41cc8d6242ccbc187f8a2809b780,

title = "Oxidation of Poly[bis(4-methylphenoxy)phosphazene] Surfaces and Chemistry of the Surface Carboxylic Acid Groups",

abstract = "Surfaces of poly[bis(4-methylphenoxy)phosphazene], [NP(OC6H4CH3)2]n, were oxidized with an aqueous KMnO4/NaOH solution, analyzed, and used as substrates for surface reactions. The small-molecule cyclic trimer, [NP(OC6H4CH3)2]3, was also oxidized as a model system. Analysis of the small-molecule reactions by solution state 13C, 31P, and 1H NMR spectroscopy and mass spectrometry confirmed that the methyl groups were oxidized to carboxylate groups. The oxidized polymer film surfaces were examined by contact angle measurements, ATR-IR, SEM, TEM, and XPS methods. The maximum depth of oxidation was 1 µm. Relationships between the reaction parameters, percent oxidation, and the contact angle have been established. The oxidized surfaces were also examined for cation exchange capability. Carboxylic acid surface units were reduced to benzylic alcohol groups. In addition, various coupling reactions were used to link 4-nitrofuroic acid and the tetrapeptide, Arg-Gly-Asp-Ser, to the polymer surfaces.",

author = "Allcock, {Harry R.} and Fitzpatrick, {Richard J.} and Lawrence Salvati",

year = "1992",

month = feb,

day = "1",

doi = "10.1021/cm00022a006",

language = "English (US)",

volume = "4",

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journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

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T1 - Oxidation of Poly[bis(4-methylphenoxy)phosphazene] Surfaces and Chemistry of the Surface Carboxylic Acid Groups

AU - Allcock, Harry R.

AU - Fitzpatrick, Richard J.

AU - Salvati, Lawrence

PY - 1992/2/1

Y1 - 1992/2/1

N2 - Surfaces of poly[bis(4-methylphenoxy)phosphazene], [NP(OC6H4CH3)2]n, were oxidized with an aqueous KMnO4/NaOH solution, analyzed, and used as substrates for surface reactions. The small-molecule cyclic trimer, [NP(OC6H4CH3)2]3, was also oxidized as a model system. Analysis of the small-molecule reactions by solution state 13C, 31P, and 1H NMR spectroscopy and mass spectrometry confirmed that the methyl groups were oxidized to carboxylate groups. The oxidized polymer film surfaces were examined by contact angle measurements, ATR-IR, SEM, TEM, and XPS methods. The maximum depth of oxidation was 1 µm. Relationships between the reaction parameters, percent oxidation, and the contact angle have been established. The oxidized surfaces were also examined for cation exchange capability. Carboxylic acid surface units were reduced to benzylic alcohol groups. In addition, various coupling reactions were used to link 4-nitrofuroic acid and the tetrapeptide, Arg-Gly-Asp-Ser, to the polymer surfaces.

AB - Surfaces of poly[bis(4-methylphenoxy)phosphazene], [NP(OC6H4CH3)2]n, were oxidized with an aqueous KMnO4/NaOH solution, analyzed, and used as substrates for surface reactions. The small-molecule cyclic trimer, [NP(OC6H4CH3)2]3, was also oxidized as a model system. Analysis of the small-molecule reactions by solution state 13C, 31P, and 1H NMR spectroscopy and mass spectrometry confirmed that the methyl groups were oxidized to carboxylate groups. The oxidized polymer film surfaces were examined by contact angle measurements, ATR-IR, SEM, TEM, and XPS methods. The maximum depth of oxidation was 1 µm. Relationships between the reaction parameters, percent oxidation, and the contact angle have been established. The oxidized surfaces were also examined for cation exchange capability. Carboxylic acid surface units were reduced to benzylic alcohol groups. In addition, various coupling reactions were used to link 4-nitrofuroic acid and the tetrapeptide, Arg-Gly-Asp-Ser, to the polymer surfaces.

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DO - 10.1021/cm00022a006

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JF - Chemistry of Materials

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Oxidation of Poly[bis(4-methylphenoxy)phosphazene] Surfaces and Chemistry of the Surface Carboxylic Acid Groups

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