Heat stable and organosoluble polyimides containing laterally-attached phenoxy phenylene groups

Behniafar, Hossein; Boland, Parvaneh

doi:10.1007/s10965-009-9338-z

Cited by 19 publications

(13 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But the crystallinity is not too high because of the incorporation of flexible phenoxy units into the polymer backbone. 31 Most of the conventional polyimides always show considerable coloration from pale yellow to deep brown due to charge-transfer complexing between alternating electrondonar (diamine) and electron-acceptor (dianhydride) moieties. The color intensities of polyimides could also be elucidated from the 0 and the % transmission observed in UV-visible absorption spectra.…”

Section: Crystallinity and Optical Propertiesmentioning

confidence: 99%

Synthesis and characterization of new soluble polyimides based on pyridine unit with flexible linkages

Amutha

Tharakan

Sarojadevi

2015

High Performance Polymers

View full text Add to dashboard Cite

A series of new polyimides were synthesized by condensation of pyridine-bridged novel diamine monomers, bis(4-aminobenzoyloxy-3,5-dimethyl phenyl)-3 0 -pyridyl methane and 2,6-bis(2-amino-3-pyridyloxy)pyridine, with various aromatic anhydrides. The monomers and precursors were characterized by elemental analysis, Fourier transform infrared (FTIR), proton nuclear magnetic resonance ( 1 H NMR), and carbon-13 nuclear magnetic resonance ( 13 C NMR) spectroscopic techniques. The structure of the polymers were characterized by FTIR and 1 H-NMR spectroscopy, and the physical properties of the polymers, including the glass transition temperature (in the range of 199-319 C), thermal and thermooxidative stability (10% weight loss temperature is in the range of 375-539 C in air and 403-542 C in nitrogen atmospheres), the char yield in the range of 37.91-56.65% at 800 C, solubility, solution viscosity (0.81-1.81), molecular weight data, optical properties, crystallinity, mechanical properties like tensile strength (86-102 MPa), elongation at break (12.5-16.5%), tensile modulus (1.2-1.8 GPa), and moisture absorption were also studied.

show abstract

Section: Crystallinity and Optical Propertiesmentioning

confidence: 99%

Synthesis and characterization of new soluble polyimides based on pyridine unit with flexible linkages

Amutha

Tharakan

Sarojadevi

2015

High Performance Polymers

View full text Add to dashboard Cite

show abstract

“…Owing to their rigid backbones and strong intermolecular interactions, most linear polyimides are usually insoluble and infusible which result in difficult processing and further limit their applications. 10,11 In recent years, tremendous efforts have been invested in developing various melt-processing or organic solvent soluble linear polyimides, which derived from novel diamine or dianhydride having one or more special functional structures, such as exible linkages, [12][13][14][15] bulky substituents, [16][17][18] uorinated 19 or sulfur 20 groups, non-coplanar and unsymmetrical structures, [21][22][23] etc. These are effective methods to overcome the above-mentioned shortcomings without sacricing their inherent excellent thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel star-branched polyimides derived from 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane

Feng

Zhou

2017

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Aromatic polyimides are high-performance polymers that exhibit exceptional thermal, mechanical, and electrical properties, and are widely used in many high-tech fields, such as in the aerospace industry, as heat-resistant insulating materials, and as packing materials for electronics [1][2][3][4][5]. After several decades of scientific and technical investigations of polyimides, they have been gradually found increasing use in advanced optoelectronic applications because their molecular structures can be modified to satisfy the precise requirements of various optical applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of thioether-containing polyimides with high refractive indices

Huang

et al. 2012

J Polym Res

View full text Add to dashboard Cite

Colorless and transparent polymers with high refractive indices and high temperature resistance have aroused great interest in the industrial community. Here, a series of polyimides (PIs) were prepared from a newly synthesized thioether-containing dianhydride, 1,4-bis(3,4-dicarboxy-phenylenesulfanyl)-benzene dianhydride, and various diamines by a two-step polycondensation reaction. Some flexible and tough films were obtained by casting solutions of them in poly(amic acid) (PAA). The tensile strengths and elongations at break of these PI films were greater than 58 MPa and 10%, respectively. All of them were thermally stable up to 500°C in both air and nitrogen. Their glass transition temperatures were in the range from 204.5 to 265.8°C. PI films with a thickness of 10-20 μm showed good optical transparency in the visible light region. Their cutoff wavelengths were lower than 400 nm and their transmittance was higher than 80% at 460 nm. The thioether linkages in the PIs endowed them with high average refractive indices (n AV ) of 1.68-1.74 and low birefringence values (Δn) of 0.0085-0.0120.

show abstract

Heat stable and organosoluble polyimides containing laterally-attached phenoxy phenylene groups

Cited by 19 publications

References 26 publications

Synthesis and characterization of new soluble polyimides based on pyridine unit with flexible linkages

Synthesis and characterization of new soluble polyimides based on pyridine unit with flexible linkages

Synthesis and characterization of novel star-branched polyimides derived from 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane

Synthesis and characterization of thioether-containing polyimides with high refractive indices

Contact Info

Product

Resources

About