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Chemistry and properties of poly(arylene ether benzoxazoles)

Chemistry and properties of poly(arylene ether benzoxazoles). Smith, J. G., Jr.; Connell, J. W.; Hergenrother, P. 2373-98-0 are also occured in this study. M. 2373-98-0 which is the cas registry number is also used here. (Langley Res. Cent., NASA, Hampton, VA 23665-5225, USA). Polymer, 33(8), 1742-7 (English) 1992. CODEN: POLMAG. ISSN: 0032-3861. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Novel poly(arylene ether benzoxazole)s were prepd. by the arom. nucleophilic displacement reaction of 2 new bis(hydroxyphenyl benzoxazole)s with activated arom. difluorides. The bis(hydroxyphenyl benzoxazole)s were prepd. from either 3,3'-dihydroxy-4,4'-diaminobiphenyl or 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and Ph 4-hydroxybenzoate. The polymns. were carried out in either AcNMe2 or di-Ph sulfone, depending on the bis(hydroxyphenyl benzoxazole). The polymers had glass transition temps. of 204-275° and inherent viscosities of 0.25-1.04 dL g-1. Several of the polymers prepd. from the 3,3'-dihydroxy-4,4'-diaminobiphenyl-derived bis(hydroxyphenyl benzoxazole) were semi-cryst. Thermogravimetric anal. showed a 5% wt. loss occurring at ~450-500° in air and ~475-530° in N. Thin films of the hexafluoroisopropylidene-contg. polymers had tensile strengths and moduli of 83-103 MPa and 1.9-2.4 GPa resp., and high elongations. The chem. and the phys. and mech. properties of these polymers were discussed. ..

Chemistry and properties of poly(arylene ether benzoxazoles)

Chemistry and properties of poly(arylene ether benzoxazoles). Smith, J. G., Jr.; Connell, J. W.; Hergenrother, P. 2373-98-0 are also occured in this study. M. 2373-98-0 which is the cas registry number is also used here. (Langley Res. Cent., NASA, Hampton, VA 23665-5225, USA). Polymer, 33(8), 1742-7 (English) 1992. CODEN: POLMAG. ISSN: 0032-3861. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Novel poly(arylene ether benzoxazole)s were prepd. by the arom. nucleophilic displacement reaction of 2 new bis(hydroxyphenyl benzoxazole)s with activated arom. difluorides. The bis(hydroxyphenyl benzoxazole)s were prepd. from either 3,3'-dihydroxy-4,4'-diaminobiphenyl or 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and Ph 4-hydroxybenzoate. The polymns. were carried out in either AcNMe2 or di-Ph sulfone, depending on the bis(hydroxyphenyl benzoxazole). The polymers had glass transition temps. of 204-275° and inherent viscosities of 0.25-1.04 dL g-1. Several of the polymers prepd. from the 3,3'-dihydroxy-4,4'-diaminobiphenyl-derived bis(hydroxyphenyl benzoxazole) were semi-cryst. Thermogravimetric anal. showed a 5% wt. loss occurring at ~450-500° in air and ~475-530° in N. Thin films of the hexafluoroisopropylidene-contg. polymers had tensile strengths and moduli of 83-103 MPa and 1.9-2.4 GPa resp., and high elongations. The chem. and the phys. and mech. properties of these polymers were discussed. ..