scholarly journals Synthesis and characterization of new polyimides from diphenylpyrene dianhydride and ortho methyl substituted diamines

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 31881-31888
Author(s):  
R. Sulub-Sulub ◽  
M. I. Loría-Bastarrachea ◽  
J. L. Santiago-García ◽  
M. Aguilar-Vega
Keyword(s):  
Synthesis And Characterization ◽  
Methyl Substitution ◽  
Tetracarboxylic Dianhydride

Three new polyimides were synthesized from 3,8-diphenylpyrene-1,2,6,7-tetracarboxylic dianhydride (DPPD) with two diamines with ortho methyl substitution (MBDAM and HFI) and one diamine without ortho substituents (BAPHF).

Synthesis and Characterization of New Soluble Polyimides from 3,3‘,4,4‘-Benzhydrol Tetracarboxylic Dianhydride and Various Diamines

1998 ◽  
Vol 10 (3) ◽  
pp. 734-739 ◽  
Author(s):  
Der-Jang Liaw ◽  
Been-Yang Liaw ◽  
Lain-Jong Li ◽  
Bernard Sillion ◽  
Régis Mercier ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Tetracarboxylic Dianhydride

Synthesis and Characterization of Polyimides Derived from 5-Amino-2(p-aminophenyl) Benzoxazole Monomer

2011 ◽  
Vol 415-417 ◽  
pp. 1789-1793
Author(s):  
Xiang Li Meng ◽  
Peng Wang ◽  
Ling Jiang
Keyword(s):  
Amic Acid ◽  
Synthesis And Characterization ◽  
Polyimide Films ◽  
Glass Transition Temperatures ◽  
Good Thermal Stability ◽  
Light Yellow ◽  
Structures And Properties ◽  
Ft Ir ◽  
Tetracarboxylic Dianhydride

Polyimides prepared from 5-amino-2(p-aminophenyl) benzoxazole (AAPB) with pyromellitic dianhydride(PMDA), 2,2’3,3’-biphenyl tetracarboxylic dianhydride(i-BPDA), 4,4’-oxdiphthalic anhydride(ODPA), 1,4-bis(3,4-dicarbosyphenoxy) benzene dianhydride(HQDPA) and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) were synthesized successfully via a conventional two-stage method. Their structures and properties were characterized by FT-IR, DSC, TG and XRD. The intermediate poly(amic acid)s had inherent viscosity range of 0.86~2.18 dL/g and could be thermally converted into light yellow polyimide films. The polyimides showed excellent solvent resistance and good thermal stability. The glass transition temperatures (Tg) were found to be 336oC~369 oC .The decomposition started at a temperature above 530oC in N2 atmosphere.

Synthesis and Characterization of the Three Dicyclopentapyrenes

1996 ◽  
Vol 61 (10) ◽  
pp. 3572-3572
Author(s):  
Lawrence T. Scott ◽  
Atena Necula
Keyword(s):  
Synthesis And Characterization

Synthesis and characterization of TiN / Ti / AISI 410 coatings

2018 ◽  
Vol 2 (1) ◽  
pp. 7
Author(s):  
S Chirino ◽  
Jaime Diaz ◽  
N Monteblanco ◽  
E Valderrama
Keyword(s):  
Synthesis And Characterization ◽  
Photoemission Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Columnar Grains ◽  
Tin Thin Films ◽  
Steel Aisi ◽  
Interacting Surfaces ◽  
Stainless Steel Aisi

The synthesis and characterization of Ti and TiN thin films of different thicknesses was carried out on a martensitic stainless steel AISI 410 substrate used for tool manufacturing. The mechanical parameters between the interacting surfaces such as thickness, adhesion and hardness were measured. By means of the scanning electron microscope (SEM) the superficial morphology of the Ti/TiN interface was observed, finding that the growth was of columnar grains and by means of EDAX the existence of titanium was verified.  Using X-ray diffraction (XRD) it was possible to observe the presence of residual stresses (~ -3.1 GPa) due to the different crystalline phases in the coating. Under X-ray photoemission spectroscopy (XPS) it was possible to observe the molecular chemical composition of the coating surface, being Ti-N, Ti-N-O and Ti-O the predominant ones.

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