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Citation: GAO Yuan, ZHANG Mao-Gen, WANG Bing-Xiang, SHEN Jian. Preparation and Heat-Resistance of DDM-PMDA-HAB Benzoxazole-Imide Copolymers[J]. Chinese Journal of Applied Chemistry, ;2006, 23(9): 1027-1031. shu

Preparation and Heat-Resistance of DDM-PMDA-HAB Benzoxazole-Imide Copolymers

GAO Yuan ^a,b ,
ZHANG Mao-Gen ^a,b,, ,
WANG Bing-Xiang ^a,b ,
SHEN Jian ^a,b,c

1.
a School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097;
2.
b Jiangsu Provincial Engineering Research Center of Biomedical Functional Materials, Nanjing;
3.
c Research Center of Surface and Interface Chemistry and Engineering Technology, Nanjing University, Nanjing

Corresponding author: ZHANG Mao-Gen,
Received Date: 24 October 2005
Available Online: 18 February 2006
Fund Project: 上海伊曼纺织化工有限公司资助(南京师范大学211090B423) (南京师范大学211090B423)

Three poly(amic acid) copolymers(CPAAs) were synthesized from 4,4'-diamino diphenyl methane(DDM),3,3'-dihydroxy-4,4'-diamino-biphenyl(HAB) and pyromellitic dianhydride(PMDA) by condensation in N,N-dimethylacetamide at room temperature.Thermal cyclodehydration of CPAA cast films led to the formation of copolyimides(CPIs),which were rearranged to DDM-PMDA-HAB benzoxazole-imide copolymers(CPBIs) by further thermal treatment at 500℃ under nitrogen.ATR spectra showed the charac-teristic structure of CPIs and CPBIs.TGA analysis confirmed the rearrangement to the formation of Polybenzoxazoles(PBOs).All the CPBI films displayed excellent thermal stability,shown by T_d,the temperature at which the mass loss of the polymer is 5%.T_d values of CPBI films are 93~138℃ higher than that of corresponding CPIs,and 65~86℃ higher than that of PMDA-HAB PBO.The molar ratio of cheap DDM among diamines can increase up to 75%,while the CPBIs still have the excellent heat resistance(T_d is 573℃).
- poly(amic acid) copolymer(CPAA),
- copolyimides(CPI),
- benzoxazole-imide copolymers(CPBI),
- polybenzoxazole(PBO),
- preparation,
- heat-resistance
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