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SYNTHESIS AND CHARACTERIZATION OF A SERIES OF POLYBENZOBISOXAZOLES
Alternative TitleSYNTHESIS AND CHARACTERIZATION OF A SERIES OF POLYBENZOBISOXAZOLES
Cui Tianfang1; Chen Ping1; Lu Chun2; Qi Wen1
2010
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue2Pages:173-177
AbstractA series of polybenzobiso xazoles, including PBO, poly(1,4-naphthalene benzobisoxazole) (1,4-PNBO), poly (2,6-naphthalene benzobi soxazole) (2, 6-PNBO), poly (2, 5-thiophene benzobisoxazole) (PTBO) and poly-4, 4'-(1, 2-diphynylethylene benzobisoxazole 4, 4'-PDPEBO), were synthesized by polycondensation of 4, 6-diamino-1,3-benzenediol dihydrochloride with terephthalic acid, I, 4-naphthalene dicarboxylic acid, 2, 6-naphthalenedicarboxylic acid, 2, 5-thiophenedicarboxylic acid and 4, 4'-(1, 2-diphynylethylene)dicarboxylic acid in polyphosphoric acid, and the relationship between the resulting polymer chain structures and the properties of the polybenzobisoxazoles was investigated. The results showed that the target polymers were Successfully Synthesized proved by Fourier transform infrared spectra and elemental analysis. And the thermal stability of PBO, I 4-PNBO, 4 4'-PDPEBO, 2, 6-PNBO and PTBO decreased in turn from thermal gravimetric analysis. The reasons are that 1,4-phenylene chains in the PBO possesses the best rigidity among all the polybenzobisoxazole chains. And C C bonds in ethylidene of 4 4'-PDPEBO are easy to be broken under high temperature, even though 4 4'-PDPEBO has two phenylene chains, and so 4 4'-PDPEBO has worse thermal resistance compared with PBO and I 4-PNBO. Bond energy of C-S bonds in PTBO chains is less than that of C C bonds or C-C bonds in other polybenzobisoxazoles, and so PTBO possesses the worst thermal resistance among all the polybenzobisoxazoles. The intrinsic viscosity of PBO, 4, 4'-PDPEBO, I 4-PNBO, 2,6-PNBO and PTBO decreased in turn, and the data were 25. 40, 20. 63, 16. 76, 15. 38, 14. 63 dL/g, respectively. The main reasons are that linearity and symmetry of I 4-phenylene group, 4 4'-(1,2-diphynyl) ethylene group, 1, 4-naphthalene group, 2, 6-naphthalene group and 2, 5-thiophene group decreased in turn, and the stereo-hindrance effect of these groups increased in turn.
KeywordPolybenzobisoxazoles Poly(1,4-phenylene benzobisoxazole) Synthesis Thermal stability
Indexed ByCSCD
Language英语
CSCD IDCSCD:3822952
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/146637
Collection中国科学院金属研究所
Affiliation1.大连理工大学
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Cui Tianfang,Chen Ping,Lu Chun,et al. SYNTHESIS AND CHARACTERIZATION OF A SERIES OF POLYBENZOBISOXAZOLES[J]. ACTA POLYMERICA SINICA,2010(2):173-177.
APA Cui Tianfang,Chen Ping,Lu Chun,&Qi Wen.(2010).SYNTHESIS AND CHARACTERIZATION OF A SERIES OF POLYBENZOBISOXAZOLES.ACTA POLYMERICA SINICA(2),173-177.
MLA Cui Tianfang,et al."SYNTHESIS AND CHARACTERIZATION OF A SERIES OF POLYBENZOBISOXAZOLES".ACTA POLYMERICA SINICA .2(2010):173-177.
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