Synthesis and properties of organosoluble polyimides derived from bis(4‐amino‐3,5‐dimethyl phenyl) halo phenyl methane and various dianhydrides

Hariharan, R.; Sarojadevi, M.

doi:10.1002/app.24152

Cited by 32 publications

(34 citation statements)

References 28 publications

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“…The mechanical properties of the prepared PTAIs are comparable to those of commercial polyimides (Ultem1000: tensile strength 105 MPa; tensile modulus 3 GPa; elongation at break 6%). 3 This series of PTAIs possess good tensile properties, suggesting that these polymers can be applied as new materials for engineering plastics applications.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

“…However, highly optical transparency is also one of the most attractive properties of polyimide (PI) materials for optical applications. [2][3][4] Over the years, a tremendous amount of work has been performed on structure/property relationships in polyimides to obtain fundamental information that could be used to develop polyimides with unique combination of properties for demanding applications. Consequently, the studies utilizing monomers containing heterocyclic unit to synthesize novel heteroaromatic polymers have been focused widely.…”

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confidence: 99%

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Preparation and Properties of Polyimides Containing 1,2,3‐Triazole Moieties

Rukmanikrishnan

Sarojadevi

2015

Adv Polym Technol

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ABSTRACT:A new diamine containing 1,2,3-triazole ring was synthesized by the click reaction in the presence of Cu (I) catalyst.A series of novel polytriazoleimides (PTAIs) were synthesized using the prepared diamine by the conventional two-step thermal or chemical imidization method with commercially available aromatic dianhydrides. The chemical structure of the monomers and polymers was characterized by Fourier transform Infrared, 1 H nuclear magnetic resonance (NMR), and 13 C NMR spectral analysis. Solubility of the PTAIs was tested in various organic solvents. The glass transition temperatures of these PTAIs are in the range of 215-254°C. PTAIs exhibit low dielectric constant of 3.04-3.34 at 1 MHz, high thermal stability, and temperature corresponding to 5% (T 5% ) weight loss is in the range of 442-492°C. The flame retardance values (limiting oxygen index) are in the range of 38.4-40.5. The PTAI films exhibited good mechanical properties with tensile strength of 96.2-98.9 MPa, elongation to break of 9.8-12.6%, and tensile modulus of 2.5-3

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Section: Mechanical Propertiesmentioning

confidence: 98%

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confidence: 99%

Preparation and Properties of Polyimides Containing 1,2,3‐Triazole Moieties

Rukmanikrishnan

Sarojadevi

2015

Adv Polym Technol

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“…In order to overcome these drawbacks, many efforts on chemical modifications of PIs have been made, such as introduction of flexible linkages [4][5][6], bulky units [7,8], bulky pendent substituents [9][10][11], and noncoplanar moieties [12], in the polymer backbone. Solubility of PIs can also be improved by incorporation of less symmetric structures such as ortho-or metalinked aromatic units in the main chain [13,14]. The incorporation of ortho-or meta-linked units into the polymer backbone may have interrupted the chain packing, thus leading to improved solubility.…”

Section: Introductionmentioning

confidence: 99%

Soluble polyimides based on a novel pyridine-containing diamine m,p-PAPP and various aromatic dianhydrides

et al. 2010

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A novel pyridine-containing aromatic diamine monomer, 4-phenyl-2,6-bis[3-(4-aminophenoxy)phenyl]pyridine (m,p-PAPP), was successfully synthesized by a modified Chichibabin reaction of benzaldehyde and a substituted acetophenone, 3-(4-nitrophenoxy)acetophenone (m,p-NPAP), followed by a reduction of the resulting dinitro compound 4-phenyl-2,6-bis[3-(4-nitrophenoxy)phenyl]pyridine (m,p-PNPP) with Pd/C and hydrazine monohydrate. The aromatic diamine was employed to synthesize a series of pyridine-containing polyimides (PIs) by polycondensation with various aromatic dianhydrides in N,N-dimethylformamide (DMF) via the conventional two-step method, and further thermal or chemical imidization forming PIs. The inherent viscosities of the resulting poly(amic acid)s and PIs were 0.59-0.73 and 0.56-0.68 dL/g; most of the PIs obtained by chemical imidization were readily soluble in common organic solvents such as DMF, N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran (THF), etc. Meanwhile, strong and flexible PI films were obtained, which had good thermal stability, with the glass transition temperature (T g ) of 204.5-237.4°C and the temperature at 10% weight loss of 527.7-552.0°C in nitrogen atmosphere, as well as outstanding mechanical properties with tensile strengths of 88.6-90.4 MPa, a tensile moduli of 1.04-1.56 GPa, and elongations at break of 7.2-8.7%. The PI films also were found to possess low water uptake of 0.89-0.98%.

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“…Bisthiosemicarbazones can act as tetradentate ligands and can be coordinated with nickel and copper ions via N 2 S 2 or N 4 atoms. We have reported the preparation of polyamides from a copper complex of benzyl bisthiosemicarbazone (LH 6 ) with different dicarboxylic acids in a previous publication. 21 To the best of our knowledge, no article has dealt with the preparation of PIs from LH 6 and its complexes with copper and nickel.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Schiff‐base‐containing polyimides

Ghaemy

Mighani

2010

J of Applied Polymer Sci

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Benzyl bisthiosemicarbazone and its complexes with nickel (NiLH 4 ) and copper (CuLH 4 ) were used as diamine monomers for the synthesis of new Schiff-base polyimides. The solution polycondensation of these monomers with the aromatic dianhydrides afforded metal-containing Schiff-base polyimides with inherent viscosities of 0.98-1.33 dL/g (measured in N-methyl-2-pyrrolidone at 25 C). The polyimides were generally soluble in a wide range of solvents such as N,N-dimethylformamide, N,Ndimethylacetamide, tetrahydrofuran, dimethyl sulfoxide, tetrachloroethane, hexamethylene phosphoramide, Nmethyl-2-pyrrolidone, ethyl acetate, and pyridine at room temperature. The initial degradation temperatures of the resultant polyimides fell in the range of 220-350 C in nitrogen with char yields ranging from 36 to 64% at 700 C.

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Synthesis and properties of organosoluble polyimides derived from bis(4‐amino‐3,5‐dimethyl phenyl) halo phenyl methane and various dianhydrides

Cited by 32 publications

References 28 publications

Preparation and Properties of Polyimides Containing 1,2,3‐Triazole Moieties

Preparation and Properties of Polyimides Containing 1,2,3‐Triazole Moieties

Soluble polyimides based on a novel pyridine-containing diamine m,p-PAPP and various aromatic dianhydrides

Synthesis and characterization of Schiff‐base‐containing polyimides

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