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Citation: GAO Yuan, ZHANG Mao-Gen, WANG Fang, WANG Bing-Xiang, SHEN Jian. Preparation and Heat-Resistance of PMDA-BPDA-HAB Polybenzoxazoles[J]. Chinese Journal of Applied Chemistry, ;2005, 22(10): 1096-1099. shu

Preparation and Heat-Resistance of PMDA-BPDA-HAB Polybenzoxazoles

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

1.
a School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097;
2.
b Analysis and Test Center, Nanjing Normal University, Nanjing 210097;
3.
c Engineering Research Center of Biomedical Functional Materials, Nanjing;
4.
d Research Center of Surface and Interface Chemistry and Engineering Technology, Nanjing University, Nanjing

Corresponding author: ZHANG Mao-Gen,
Received Date: 26 October 2004
Available Online: 30 March 2005
Fund Project: 上海伊曼化学公司项目(南京师范大学211090B423)资助 (南京师范大学211090B423)

Five Polyimides(PIs) were prepared from 3,3'-dihydroxy-4,4'-diamino-biphenyl(HAB) and 3,3',4,4'-biphenyltetra-carboxylic dianhydride(BPDA),pyromellitic dianhydride(PMDA),or their mixtures by condensation,and then dehydration-imidization.The derivative thermogravimetry(DTG) of the thermogravimetric analysis(TGA) showed 2 heat decomposition peaks,upon which the heat decomposition process can be considered as two-staged——the formation of Polybenzoxazoles(PBOs) and then the decomposition of PBOs.The DTG curves of the PI films treated at 500℃ for 1 h under nitrogen showed only one peak,which indicated that PIs can be sufficiently converted into PBO.The structures of the PIs and the PBOs were characterized by FTIR.The heat resistance(HR) of PBOs,indicated by the decomposition onset temperature T_d,was better than that of PIs by 100~170℃.HR of PMDA-HAB PBO was better than that of BPDA-HAB PBO.HR of HAB-BPDA-PMDA PBOs with different BPDA/PMDA molar ratios was better than that of BPDA-HAB PBO or PMDA-HAB PBO.The HAB-BPDA-PMDA PBO with molar ratio of 1:0.25:0.75 showed the best HR.
- pyromellitic dianhydride(PMDA),
- biphenyltetracarboxylic dianhydride(BPDA),
- dihydroxy-diamino-biphenyl(HAB),
- polyimide(PI),
- polybenzoxazole(PBO),
- heat-resistance
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