Synthesis, characterization and hydrolytic stability of poly (amic acid) ammonium salt

Cai, Dongdan; Su, Jianfeng; Mei, Huang; Liu, Yanhua; Wang, Jianjun; Dai, Lixing

doi:10.1016/j.polymdegradstab.2011.09.008

Cited by 27 publications

(29 citation statements)

References 24 publications

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“…When OMMT content further increased to 5 wt%, the modulus increased to 11.23 GPa, which is 58% higher than the pure PI s film. Moreover, the tensile strength for the pure PI s film was 145.2 MPa, while as the hybrid films PI s O 5 added to 5 wt% of OMMT, the tensile strength increased to 168.36 MPa, and the tensile strength was even higher than that of PI a derived from PAA (164.3 MPa as reported in our previous paper ). The increase of the Young's modulus reflected the reinforcement effect that was attributed to the homogeneous dispersion of OMMT into the PI matrix and strong interaction between OMMT and PI.…”

Section: Results and Disscussionsupporting

confidence: 72%

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Enhanced mechanical and thermal properties of polyimide/organically modified montmorillonite hybrid film based on stable poly(amic acid) ammonium salt

et al. 2013

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In this study, polyimide/organically modified montmorillonite (PI/OMMT) hybrid film was prepared by in situ polymerization from the stable poly(amic acid) ammonium salt/OMMT (PAAS/OMMT) precursor hybrid. PAAS was obtained by incorporating calculated triethylamine into terpolymer poly(amic acid) (PAA), which was synthesized by pyromellitic dianhydride (PMDA), 4,4′‐oxydianiline and p‐phenylenediamine in dimethylacetamide (DMAc). OMMT as a type of layered clays was prepared through surface treatment of montmorillonite (MMT) with 1‐hexadecylamine. Mechanical property measurements of PI/OMMT hybrid film indicated that the addition of 5 wt% of OMMT increased the Young's modulus of PI film up to 11.24 GPa, which is 58% higher than the pristine PI film from PAAS. Besides, the tensile strength increased to 168.36 MPa, which was higher than that of PI film derived from PAA (164.3 MPa) and PI film derived from PAAS (145.2 MPa). Moreover, the thermal stabilities of PI/OMMT hybrid film with appropriate OMMT content were also better than those of original PI films. POLYM. COMPOS., 34:2076–2081, 2013. © 2013 Society of Plastics Engineers

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Section: Results and Disscussionsupporting

confidence: 72%

“…In our previous work , the synthesis and characterization of PI film based on stable PAAS precursors has been reported. It was found that the hydrolytic stability and water‐solubility of PAAS precursors could be significantly enhanced by neutralizing the PAA's carboxylic acid groups with triethylamine (TEA).…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical and thermal properties of polyimide/organically modified montmorillonite hybrid film based on stable poly(amic acid) ammonium salt

et al. 2013

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“…salt is a more stable form of polyamic acid which is the polyimide precursor [14]. The morphology of the titanate nanosheets and nanotubes were examined with scanning electron microscopy (SEM) and transmission electron microscopy (TEM).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Titanate nanotubes and nanosheets as a mechanical reinforcement of water-soluble polyamic acid: Experimental and theoretical studies

Harito

Bavykin

Light

et al. 2017

Composites Part B: Engineering

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Titanate nanosheets (TiNS), titanate nanotubes (TiNT), and scrolled titanate nanosheets (STiNS) were used to synthesise polymer nanocomposites by solution processing. The hardness was found to increase by 90% on addition of 2% TiNS while the modulus (Er) increased by 103% compared to the pure polymer. Small angle X-ray scattering (SAXS) measurements of composite films were used to study alignment of nanostructures within the polymer. The obtained data on mechanical properties of composites have been tested against theoretical values and it was established that both nanostructures alignment as well as their mechanical properties affect the hardness and modulus of the polymer composites. At a low content of TiNS, the reinforcement behaviour matched well with Halpin-Tsai theory which assumes the filler has unidirectional orientation. After addition of 2 wt% TiNT, the hardness and modulus of the polyamic acid salt composites increased by 91% and 165%, respectively, and were higher than theoretical predictions, indicating that both TiNT and STiNS, prepared by hydrothermal synthesis, may have higher mechanical properties than bulk TiO 2. At a high filler loading (>2 wt%), the mechanical properties of composites do not fit established theories due to agglomeration of titanate nanostructures.

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“…The second problem for the traditional process is that water will make the PAA degradation rapidly if the hybrid system brings in water. People have done lots of research on PAA in order to solve these problems, which found that preparing other precursors of PIs, such as poly(amic acid) esters and poly(amic acid) ammonium salt (PAAS) , could reduce the degradation of amide linkage. Especially, PAAS is attractive because it is easy to synthesize and is soluble in water, which are beneficial for both environment and practical issues .…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of silica/polyimide nanocomposite films based on water‐soluble poly(amic acid) ammonium salt

Weng

Yang

et al. 2015

Polymer Composites

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In this article, a series of new silica/polyimide (SiO2/PI) nanocomposite films with high dielectric constant (>4.0), low dielectric loss (<0.0325), high breakdown strength (288.8 kV mm−1), and high volume resistivity (2.498 × 1014 Ω m) were prepared by the hydrolysis of tetraethyl orthosilicate in water‐soluble poly(amic acid) ammonium salt (PAAS). The chemical structure of nanocomposite films compared with the traditional pure PI was confirmed by Fourier transform infrared spectroscopy and X‐ray diffraction patterns. The results indicated that both the PAAS and the polyamide acid (PAA) material were effectively converted into the corresponding PI material through the thermal imidization and the amorphous SiO2 was embedded in the nanocomposite films without structural changes. Thermal stability of the nanocomposite films was increased though mechanical property was generally decreased with increasing the mass fraction of SiO2. All the nanocomposite films exhibited an almost single‐step thermal decomposition behavior and the average decomposition temperature was about 615°C. It was concluded that the effective dispersion of SiO2 particles in PI matrix vigorously improved the comprehensive performance of the SiO2/PI nanocomposite films and expanded their applications in the electronic and environment‐friendly industries. POLYM. COMPOS., 38:774–781, 2017. © 2015 Society of Plastics Engineers

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Synthesis, characterization and hydrolytic stability of poly (amic acid) ammonium salt

Cited by 27 publications

References 24 publications

Enhanced mechanical and thermal properties of polyimide/organically modified montmorillonite hybrid film based on stable poly(amic acid) ammonium salt

Enhanced mechanical and thermal properties of polyimide/organically modified montmorillonite hybrid film based on stable poly(amic acid) ammonium salt

Titanate nanotubes and nanosheets as a mechanical reinforcement of water-soluble polyamic acid: Experimental and theoretical studies

Preparation and characterization of silica/polyimide nanocomposite films based on water‐soluble poly(amic acid) ammonium salt

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