Preparation of novel T-type nonlinear optical polyimide with high thermal stability of second harmonic generation

Lee, Ga Young; Jang, Han Na; Jung, Won Taek; Lee, Ju‐Yeon

doi:10.1007/bf03218589

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Aromatic polyimides (PIs) are well known as high‐performance materials because of their excellent thermal stability and balanced mechanical and electrical properties and have been extensively used in numerous applications, mostly in the form of films and coatings . On the other hand, they are polymers of very poor solubility and, therefore, many efforts have been dedicated to design and produce novel polyimides with improved processability . Therefore, synthetic modifications have been tried by incorporating flexible linkages , bulky pendant groups , and noncoplanar biphenylene moieties into the polymer backbones.…”

Section: Introductionmentioning

confidence: 99%

Study properties of nanocomposites prepared with new polyimides and reactive nanosilica by epoxide functionalization

2014

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In this article, new types of organosoluble polyimides, poly(carbazole-quinoxaline-imide)s (PCQI), were synthesized and used in preparation of nanocomposites with modified nanosilica (mNS). The synthesized polyimides bearing different solubilizing functional moieties were casted into thin films at room temperature. SiO 2 nanoparticles were surface modified with gglycidoxypropyltriethoxysilane (GPTES) to obtain mNS containing epoxide functional groups. The PCQI/mNS nanocomposites were prepared via cure reaction of epoxide groups and polymer functional units. The PCQIs and nanocomposites films were tested for different properties including thermal using TGA and DMTA, mechanical, thermomechanical, photophysical, solubility, water uptake, and metal ions adsorption. The strong chemical bonding between mNS particles and polymer matrix reduced solubility of nanocomposite and enhanced thermal stability in term of 10% weight loss temperature (T 10% , from 509 C to 582 C) and tensile strength (from 110 MPa to 155 MPa). These polyimides and nanocomposites were also efficient chelating agents for removal of metal ions such as Cr 2 O 22 7 , Cr 31 , Pb 21 , Cd 21 , and Hg 21 from aqueous solutions either individually or in the mixture and at different pH values. POLYM. COMPOS., 36:545-555, 2015.

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Section: Introductionmentioning

confidence: 99%

Study properties of nanocomposites prepared with new polyimides and reactive nanosilica by epoxide functionalization

2014

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“…Aromatic polyimides are versatile engineering polymers that have been widely used in many applications, such as membrames for gas separation 1,2 and proton exchange, [3][4][5][6] non-linear optical materials, 7,8 liquid crystal displays, [9][10][11] photoresists 12,13 and other microelectronics and optoelectronics 14 applications because of their outstanding thermal stability, mechanical and electrical characteristics. 15,16 Unless carefully designed, however, polyimides have high softening temperatures and are often insoluble in most organic solvents in their imidized form, making them extremely difficult to fabricate.…”

Section: Introductionmentioning

confidence: 99%

Novel organosoluable aromatic polyimides derived from unsymmetrical 1,3-bis(4-aminophenoxy)naphthalene and aromatic dianhydrides

Chen

Wang

2010

Macromol. Res.

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A novel unsymmetrical diamine, 1,3-bis(4-aminophenoxy)naphthalene, was prepared through the nucleophilic displacement of 1,3-dihydroxynaphthalene with p-fluoronitrobenzene in the presence of potassium carbonate, followed by catalytic reduction with hydrazine. A series of novel aromatic polyimides containing bis(phenoxy)naphthalene units were synthesized from the unsymmetrical diamine and a range of aromatic tetracarboxylic dianhydrides via the usual two-step procedures that included ring-opening polyaddition and thermal/ chemical cyclodehydration. The poly(amic acid)s had inherent viscosities ranging from 0.65 to 2.01 dL/g. All the poly(amic acid)s could be converted thermally into transparent, flexible, and tough polyimide films. Most of the polyimides were soluble in organic solvents, such as dimethylacetamide, N-methyl-2-pyrrolidone, m-cresol, or ochlorophenol due to the unsymmetrical and bulky pendant naphthalene groups. The tensile strength and elongation at break of the polyimide films ranged from 74 to 97 MPa and 4 to 7%, respectively. These polyimides had glass transition temperatures ranging from 221 to 312 ºC. Thermogravimetric analysis revealed these polymers to be fairly stable up to 500 ºC, and the 10% weight loss temperature were recorded in the range of 531-580 ºC in nitrogen and 522-570 ºC in air. The substituted position effect of bis(phenoxy)naphthalene on the properties of the polyimides were investigated. The polyimides derived from unsymmetrical 1,3-substituted bis(4-aminophenoxy)naphthalene showed better solubility without sacrificing their thermal and mechanical properties due to the unsymmetrical and bulky pendant effects.

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“…Their insolubility and high glass transition temperature are in general merit, but sometimes these features cause a difficulty in facile synthesis and/or melt processing. 3,4 In this context synthetic modifications have been tried by incorporating flexible linkages, 5,6 bulky pendant groups, [7][8][9] and noncoplanar biphenylene moieties [10][11][12] into the polymer backbones. Poly(amide-imide)s (PAI) are one of such modified aromatic PIs and are known to have high thermal stability and good solubility in polar amide type solvents.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of rigid rod-like polyimide/flexible coil-like poly(amide-imide) molecular composite films

Choi

Kim

et al. 2010

Macromol. Res.

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We report the microstructure and properties of polyimide molecular composite films fabricated from a rigid rod-like polyimide [poly(pyromellitic dianhydride-p-phenylene diamine) (PMDA-PDA PI)] and a flexible coil-like poly(amide-imide) [poly(trimellitic anhydride chloride-4,4'-oxydianiline) (TMAC-ODA PAI)]. The molecular composite films were prepared by the thermal imidization of precursor molecular composite films consisting of soluble precursors of PMDA-PDA PI and TMAC-ODA PAI. The microstructure of the polyimide/ poly(amide-imide) molecular composite films was characterized by infrared spectroscopy and X-ray diffraction. The thermal, optical, dielectric, and mechanical properties of the molecular composite films were examined using a thermogravimetric analyzer, differential scanning calorimeter, prism coupler, impedance analyzer, and universal testing machine. The results showed that the molecular composite films exhibited a single glass transition, indicating good compatibility between the two components. However, most of the properties showed a nonlinear trend with the compositions in the presence of a critical point at PMDA-ODA PI/TMAC-ODA PAI = 40/60 (wt/wt).

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Preparation of novel T-type nonlinear optical polyimide with high thermal stability of second harmonic generation

Cited by 6 publications

References 17 publications

Study properties of nanocomposites prepared with new polyimides and reactive nanosilica by epoxide functionalization

Study properties of nanocomposites prepared with new polyimides and reactive nanosilica by epoxide functionalization

Novel organosoluable aromatic polyimides derived from unsymmetrical 1,3-bis(4-aminophenoxy)naphthalene and aromatic dianhydrides

Microstructure and properties of rigid rod-like polyimide/flexible coil-like poly(amide-imide) molecular composite films

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