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Chinese Journal of Materials Research  2018, Vol. 32 Issue (11): 820-826    DOI: 10.11901/1005.3093.2018.327
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Synthesis and Property of Bismaleimide Resins Containing Fluorene Cardo and Cyano Groups
Siyang LIU1, Ping CHEN1(), Xuhai XIONG2, Qi YU2
1 State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
2 Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang 110136, China
Cite this article: 

Siyang LIU, Ping CHEN, Xuhai XIONG, Qi YU. Synthesis and Property of Bismaleimide Resins Containing Fluorene Cardo and Cyano Groups. Chinese Journal of Materials Research, 2018, 32(11): 820-826.

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Abstract  

One novel oligomeric BMI monomer of n ≈1 containing fluorene cardo and cyano groups (PFCBMI) was synthesized with 9,9′-bis[4-(4-maleimidophenoxy)phenyl] fluorine and dichlorobenzonitrile as raw materials. The chemical structure as well as the curing behavior and the thermal stability of the BMIs were characterized by means of 1H NMR spectroscopy and Fourier transform infrared spectroscopy (FTIR) as well as dynamic differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). In addition, the copolymerizations of PFCBMI/BDM resins were investigated. Results show that the characteristic parameters of DSC curves for PFCBMI/BDM resin system increased with the increase of PFCBMI; The increase of PFCBMI leads to the decrease of the crosslink density and thus the decrease of the characteristic parameters for PFCBMI/BDM resins. Furthermore, the PFCBMI/BDM composites present excellent heat resistance with the storage modulus about 10 GPa and the glass transition temperature above 470°C.

Key words:  organic polymer materials      fluorene cardo group      cyano group      bismaleimide      curing behavior      heat resistance     
Received:  16 May 2018     
ZTFLH:  TQ332.4  
Fund: Supported by National Defense Fundamental Research Key Program (No. A35201XXXXX), National Natural Science Foundation of China (Nos. 51303107 & 51703003), Fundamental Research Funds for the Central Universities (No. DUT18GF107), Natural Science Foundation of Liaoning Province (No. 201602149)

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.327     OR     https://www.cjmr.org/EN/Y2018/V32/I11/820

Fig.1  Chemical structure of BDM
Fig.2  Synthetic route to BMI containing fluorene cardo and cyano groups
Fig.3  FTIR spectra of PFCBMI
Fig.4  1H-NMR spectra of PFCBMI
Monomer Ethanol Acetone Toluene DCM Chloroform THF DMF DMSO NMP
PFCBMI - ++ + ++ ++ ++ ++ ++ ++
Table 1  The solubility of PFCBMI
Fig.5  DSC curves of PFCBMI
Fig.6  TG curves of PFCBMI
Fig.7  Possible curing reactions between BDM and PFCBMI
Fig.8  DSC curves of PFCBMI /BMDM resin system
Samples Tm/℃ Ti/℃ Tp/℃ Tf/℃ Ti-Tm/℃ ΔH/Jg-1
BDM 161 178 219 241 17 55
PFCM 2.5 162 207 239 269 45 101
PFCM 5.0 161 220 250 278 59 118
PFCM 7.5 160 222 255 281 62 118
PFCM 10.0 159 222 261 288 63 122
Table 2  Characterstic data of DSC curves for PFCBMI/BDM resin system
Fig.9  TGA and DTG curves of PFCBMI/BDM system
Samples T5%/℃ T10%/℃ T20%/℃ Tmax/℃ R.W./%
BDM 501 506 511 509 51.0
PFCM 2.5 497 501 507 505 51.6
PFCM 5.0 492 498 505 501 52.5
PFCM 7.5 491 498 505 501 52.7
PFCM 10.0 491 496 503 499 53.0
Table 3  Characterstic data of thermal decomposition for PFCBMI/BDM resin system
Fig.10  DMA thermogram of composites based on PFCBMI/BDM
Samples Storage modulus (E' )
/GPa
Tanδ
50℃ 425℃ Tg/℃ Peak height
BDM 9.99 9.84 477 0.113
PFCM 2.5 9.88 9.72 476 0.100
PFCM 5.0 9.78 9.62 474 0.095
PFCM 7.5 9.69 9.58 473 0.094
PFCM 10.0 9.59 9.34 470 0.082
Table 4  Characterstic data of DMA for composites based on PFCBMI/BDM
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