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Phenolic resin-boron oxide hybrids as precursors for boron carbide (1999)

Hasegawa, Isao ; Fujii, Yoshiaki ; Takayama, Toshio ; [weitere]

Springer

Journal of materials science 18 (1999), S. 1629-1631

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ISSN: 1573-4811

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1006696825990

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Digitale Medien

Blends of polyester having amino sulfonic acid moieties with poly(vinyl alcohol) and their metal complex formation (1997)

Wang, Chonghui ; Takayama, Toshio ; Nakamura, Shigeo

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3561-3569

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ISSN: 0887-624X

Schlagwort(e): reactive polyester ; amino sulfonic acid moiety ; polyester/PVA blend ; polymer/metal complex ; chelate ; semi-IPN ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Polyester having amino sulfonic acid moieties (TBES) was prepared by a liquid/solid biphase polycondensation of terephthaloyl chloride (TPC) and N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES) in trimethyl phosphate (TMP) using triethylamine (TEA) as an acid acceptor. Blends of TBES with PVA and their metal complexes with Ni2+ and Co2+ ions were prepared. A strong interaction was observed between TBES and PVA. An electric conductivity of 10-6 S cm-1 was attained for the blend films containing about 5 wt % water. A coordination structure with two chelate rings is proposed for the metal complex with Ni2+ and Co2+ ions when the molar ratio of amino sulfonic acid groups in TBES to metal ions is larger than 2. Polymer blends complexed with Ni2+ or Co2+ ions result in semi-interpenetrating polymer networks from chelate formation. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3561-3569, 1997

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

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Digitale Medien

Synthesis of reactive aromatic polyesters having pendant chlorohydrin moieties (1996)

Wang, Chonghui ; Takayama, Toshio ; Nakamura, Shigeo

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 755-761

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ISSN: 0887-624X

Schlagwort(e): reactive polyester ; pendant chlorohydrin moiety ; interfacial polycondensation ; hydrophilicity ; hydrophobicity ; swelling ; 13C CP/MAS NMR ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A monomer containing a chlorohydrin moiety, propyl chlorohydrin diphenolate (PCHDP), was synthesized. Reactive polyesters having these pendant chlorohydrin moieties were prepared by the interfacial polycondensation of isophthaloyl chloride with PCHDP or with PCHDP and diphenolic acid using phase transfer catalyst. The molar ratio of reactants and the phase ratio of water to organic solvent strongly affect the molecular weight of resulting polymers and polymers with high molecular weight are obtained at the molar ratio of 1.0-1.15 and the phase ratio of 2.0-3.5. Swelling of the growing polymers is dependent on the molar ratio of the reactants and the phase ratio because of the hydrophilic and hydrophobic nature of the pendant chlorhydrin moiety. The resulting polymers are not soluble in any solvent except water in which hydrolysis occurs. Thus so, the structure of polymers was confirmed by 13C CP/MAS NMR. © 1996 John Wiley & Sons, Inc.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

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