Preparation and Characterization of Polyimide/BaTiO3 Nanocomposite Films with Lower Infrared Emissivity

2006 ◽  
Vol 326-328 ◽  
pp. 1749-1752
Author(s):  
Bao Ping Lin ◽  
Hong Jian Liu ◽  
Yue Ming Sun ◽  
Chun Wei Yuan
Keyword(s):  
Glass Transition ◽  
Amic Acid ◽  
Interfacial Interaction ◽  
Nanocomposite Films ◽  
Infrared Emissivity ◽  
Structure And Properties ◽  
Thermal Imidization ◽  
Polyimide Matrix ◽  
Batio3 Nanoparticles

The silicon-containing polyimide/BaTiO3 nanocomposite films were prepared by mixing the silicon-containing poly(amic acid) based on bis(3,4-dicarboxyphenyl)dimethylsilane dianhydride and 4,4'-Oxydianiline with BaTiO3 nanoparticles, followed by thermal imidization. Structure and properties of the nanocomposite films were measured with FTIR, SEM, XPS and DMTA. The results indicated that the interfacial interaction between BaTiO3 nanoparticles and the silicon-containing polyimide was conspicuous, and that BaTiO3 nanoparticles appeared to be better dispersed in the polyimide matrix at a higher BaTiO3 concentration than at a lower one. The siliconcontaining polyimide/BaTiO3 nanocomposite films exhibited higher storage modulus and glass transition temperature than the original polyimide. It was also found that the infrared emissivity of the nanocomposite films varied with the content of BaTiO3 in the nanocomposites, and the nanocomposite films exhibited lower infrared emissivity value than the corresponding polyimide by measure of infrared emissivity.

Synthesis and characterization of new poly(diketone imide)s derived from 1,4-bis(3,4-dicarboxybenzoyl)benzene dianhydride and various diamines

2020 ◽  
Vol 32 (9) ◽  
pp. 1043-1051
Author(s):  
Lu Kuang ◽  
Wei-Hong Wei ◽  
Xiao-Yan Sang ◽  
Yang Pan ◽  
Cheng Song
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Ring Opening ◽  
Tensile Modulus ◽  
Amic Acid ◽  
Synthesis And Characterization ◽  
Aromatic Diamines ◽  
Thermal Imidization ◽  
Stage Process

1,4-Bis(3,4-dicarboxybenzoyl)benzene dianhydride, an aromatic bis(ketone anhydride) monomer, was synthesized by the Friedel–Crafts reaction of terephthaloyl dichloride and o-xylene, followed by the oxidation of the intermediate tetramethylated compound and cyclodehydration of the resulting tetraacid. A series of new poly(diketone imide)s (PDKIs) were prepared from this dianhydride with various aromatic diamines via a conventional two-stage process that included ring-opening polyaddition to form the poly(amic acid)s followed by thermal or chemical imidization. Most of the PDKIs through chemical imidization were soluble in aprotic amide solvents, such as N, N-dimethylacetamide, N-methyl-2-pyrrolidone, m-cresol, and so on. The resulting PDKIs had good thermal property with the glass transition temperature of 203–275°C, the temperature at 5% weight loss of 500–539°C, and the residue of 51–60% at 800°C in nitrogen. Additionally, strong and flexible PDKI films obtained by thermal imidization exhibited outstanding mechanical property with the tensile strength of 88.8–158.5 MPa, tensile modulus of 1.9–3.5 GPa, and elongation at breakage of 7–21%.

Structure And Properties Of Binary Rodlike/Flexible Polyimide mixtures.

1991 ◽  
Vol 227 ◽  
Author(s):  
S. Rojstaczer ◽  
M. Ree ◽  
D Y. Yoon ◽  
W. Volksen
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Segregation ◽  
Amic Acid ◽  
Structure And Properties ◽  
Matrix Component ◽  
X Ray ◽  
Solution Blending ◽  
Thermal Imidization ◽  
Rodlike Polymers ◽  
Strong Surface

Abbstract:Binary mixtures of a rodlike poly(p-phenylene pyromellitimide) (PMDA-PDA) and a flexible 6F-BDAF polyimide synthesized from hexafluoroisopropylidene diphthalic anhydride and 2,2-bis(4-aminophenoxy-p-phenylene) hexafluoropropane were prepared by solution-blending of the meta-PMDA-PDA poly(amic ethyl ester) and 6F-BDAF poly(amic acid) precursors, followed by solvent evaporation and thermal imidization. The size scale of the phase separation, as measured by light scattering, is ca. I μm or smaller in most cases. Dynamical mechanical thermal analysis measurements indicate that the glass transition temperature of 6F-BDAF is unaffected in all of the mixtures studied, indicating complete demixing of rodlike and flexible polyimides in agreement with theory. X-ray photoelectron spectroscopy results show a strong surface segregation of 6F-BDAF in mixtures containing as low as 10% by weight of the 6F-BDAF component in the bulk. The mixtures with PMDA-PDA as the major matrix component therefore maintain excellent bulk properties of rodlike polymers, i.e., high modulus to 500°C, and low coefficients of thermal expansion (< ca. 10 ppm/°C). On the other hand, the surface properties of the mixtures are dominated by the flexible 6F-BDAF, resulting in excellent polymer/polymer self-adhesion (lamination) properties between fully imidized films.

Characterization of poly(amic acid)s and resulting polyimides bearing azobenzene moieties including investigations of thermal imidization kinetics and photoinduced anisotropy

2014 ◽  
Vol 64 (1) ◽  
pp. 76-87 ◽  
Author(s):  
Ewa Schab-Balcerzak ◽  
Beata Skorus ◽  
Mariola Siwy ◽  
Henryk Janeczek ◽  
Anna Sobolewska ◽  
...  
Keyword(s):  
Amic Acid ◽  
Photoinduced Anisotropy ◽  
Thermal Imidization

Synthesis of 1,4-Bis(3-amino-5-trifluoromethylphenoxy)Benzene and Properties of the Polyimide Film Therefrom

2012 ◽  
Vol 581-582 ◽  
pp. 297-300
Author(s):  
Yun Hua Lu ◽  
Bing Wang ◽  
Guo Yong Xiao ◽  
Zhi Zhi Hu
Keyword(s):  
Catalytic Reduction ◽  
Visible Region ◽  
Optical Transmittance ◽  
Polyimide Film ◽  
Amic Acid ◽  
Decomposition Temperature ◽  
Structure And Properties ◽  
Thermal Decomposition Temperature ◽  
Fluorinated Polyimides ◽  
Thermal Imidization

Firstly, 1,4-bis(3-nitro-5-trifluoromethylphenoxy)benzene(I) was synthesized through the nucleophilic substitution reaction of 3,5-dinitrobenzotrifluoride and 1,4-dihydroxybenzene in the presence of potassium carbonate. Then, the diamine monomer 1,4-bis(3-amino-5-trifluoromethylphenoxy)benzene (II) was obtained through the catalytic reduction with hydrazine and Pd/C. These fluorinated polyimides (PI) were synthesized from the fluorinated diamine II with four kinds of dianhydrides, including pyromellitic dianhydride (PMDA), 3,3’,4,4’-biphenyltetracarboxylic acid dianhydride (BPDA), 3,3’,4,4’-oxydiphthalic anhydride (ODPA) and 3,3’,4,4’-benzophenonetetracarboxylicdianhydride (BTDA) respectively, via thermal imidization of poly(amic acid) (PAA). The structure and properties of these obtained fluorinated PIs were characterized. These experimental results showed that these fluorinated PI films exhibited excellent optical transmittance in the visible region and thermal resistance. The PI derived from ODPA showed the best optical transparency with the transmittance higher than 85.38 % at 450 nm. These PIs also exhibited good thermal properties with 5 wt% thermal decomposition temperature above 533 °C.

Synthesis and properties of new clay-reinforced aromatic polyimide/nanocomposite-based 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 1,3-bis(4-aminophenoxy)propane

2014 ◽  
Vol 21 (2) ◽  
pp. 151-157
Author(s):  
Khalil Faghihi ◽  
Amir Rahimi ◽  
Akram Feyzi
Keyword(s):  
Amic Acid ◽  
Nanocomposite Materials ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Aromatic Polyimide ◽  
X Ray ◽  
Thermal Imidization ◽  
Polyimide Nanocomposite ◽  
Poly Imide

AbstractA series of poly(imide-ether)-clay nanocomposite materials-based 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 1,3-bis(4-aminophenoxy)propane and layered sodium montmorillonite (MMT/Na+) clay were successfully prepared by in situ reaction through thermal imidization up to 200°C. Poly(amic acid) (6) was prepared through the reaction of 1,3-bis(4-aminophenoxy)propane (4) and 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (5), and then a thermal plan of imidization was used for the synthesis of nanocomposite materials. The resulting nanocomposite films containing 0.5, 1, 3, and 5 wt.% of organoclay were characterized by Fourier transform infrared spectroscopy, wide-angle powder X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis, respectively. The introduction of organoclay in the polymer resulted in improved thermal stability.

Synthesis and Properties of Polyimides Containing Tert-Buty Group

2013 ◽  
Vol 275-277 ◽  
pp. 1636-1639
Author(s):  
Yun Hua Lu ◽  
Peng Pan ◽  
Bing Wang ◽  
Hong Bin Zhao ◽  
Zhi Zhi Hu
Keyword(s):  
Optical Properties ◽  
Fourier Transform ◽  
Amic Acid ◽  
Structure And Properties ◽  
Visible Spectroscopy ◽  
Polyimide Films ◽  
Solubility Test ◽  
Tert Butyl ◽  
Thermal Imidization ◽  
Ft Ir

Two diamine monomers 2-tert-butyl-1,4-bis(4-nitro-2-trifluoromethylphenoxy)benzene and 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene were reacted with the alicyclic dianhydride monomers 1,2,3,4-cyclobutanetetracarboxylic dianhydride to synthesize the poly(amic acid)s, and then obtain the corresponding polyimide films through thermal imidization. The structure and properties were characterized by fourier transform infrared spectroscopy (FT-IR), ultraviolet visible spectroscopy (UV-vis), thermogravimetic analysis (TGA), solubility test and so on. The effect of introduction of bulky tert-butyl and trifluoromethyl to the polyimide backbone on the properties of polyimide films was investigated. The experimental results showed that polyimides with tert-buty group exhibit excellent solubility, but their thermal and optical properties decreased slightly.

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