Novel polyimide-b-polyurea supramacromolecule with remarkable thermomechanical and dielectric properties

Feng, Linqian; Iroh, Jude O.

doi:10.1016/j.eurpolymj.2013.04.007

Cited by 32 publications

(34 citation statements)

References 50 publications

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“…The changes in the ATR‐FTIR spectra for PUI copolymer coatings as a function of exposure time in a 3.5 wt % of NaCl solution are given in Figure (a,b). The presence of combination of H‐bonded ordered urea and disordered urea in PUI copolymers suggests that hydrogen bonds are formed between the adjacent copolymer chains as was reported previously . In order to quantitatively describe the effect of exposure time on imide ring in PUI copolymers with varying composition, the time dependent relative imidization degree, α c ( t ) was calculated for PUI copolymer with varying PU mole fraction of “ c ” %, as shown in eq.…”

Section: Resultsmentioning

confidence: 87%

“…In order to effectively protect PI against hydrolysis, the phenomenon of structural reorganization and self‐assembling into a dense supra‐macromolecular structure reported in the previous papers enables the protection of the PI unit through the shielding of the cyclic imide functional group from hydrolysis. The changes in the ATR‐FTIR spectra for PUI copolymer coatings as a function of exposure time in a 3.5 wt % of NaCl solution are given in Figure (a,b).…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis of polyimide‐ b ‐polyurea was carried out by following the procedure outlined in the literature . Anhydride terminated poly(4,4′‐oxydiphenylene‐pyromellitamic acid), PAA, was synthesized by condensation polymerization.…”

Section: Methodsmentioning

confidence: 99%

“…According to the previous report, a novel type of polyimide‐ b ‐polyurea block copolymers prepared by Iroh and coworkers showed promise as an effective anti‐corrosion polymeric coating because of its ultra‐low dielectric constant in a 3.5 wt % NaCl solution. The presences of hydrogen bond (H‐bond) donor and H‐bond acceptor atoms in PI and polyurea blocks can lead to well‐controlled intra‐ and inter‐hydrogen bonding induced self‐assembly.…”

Section: Introductionmentioning

confidence: 99%

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Polyimide–polyurea copolymer coating with outstanding corrosion inhibition properties

Feng

Iroh

2017

J of Applied Polymer Sci

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A novel class of copolymers containing polyimide and polyurea blocks with unique physical properties and capable of providing effective protection to aluminum alloy 2024‐T3 substrate against corrosion has been prepared. The structure and properties of polyurea‐b‐polyimide (PUI) copolymers were controlled by varying the co‐monomer concentration. The PUI block copolymer can reorganize into a supra‐molecular structure by forming intra‐ and inter‐hydrogen bonding interactions between adjacent copolymer chains, resulting in a dense and compact structure capable of protecting the imide ring from hydrolysis when exposed to a corrosive environment. Apart from minimized surface hydrolysis, the establishment of compacted morphology also leads to a drastically improved barrier property and reduced diffusivity. The corrosion rate and polarization resistances of PUI‐coated aluminum alloys were measured by using direct current polarization technique. Increasing polyurea concentration resulted in a remarkable decrease in diffussivity and surface energy, consistent with the measured remarkable increase in the coatings durability and corrosion performance. Corrosion inhibition tests were carried out for more than 30 weeks in a saturated NaCl solution containing 3.5 wt % of salt. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45861.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyimide–polyurea copolymer coating with outstanding corrosion inhibition properties

Feng

Iroh

2017

J of Applied Polymer Sci

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“…[1][2][3][4] The structural similarity of PIs and PAIs is such that they have found common use in integrated optics, [5,6] membrane separations, [7,8] microelectromechanical devices, [9,10] etc. Nevertheless, the application of these polymers is limited due to their poor solubility in organic solvents, which is caused by high aromaticity and strong imide linkages in the polymer chain.…”

Section: Introductionmentioning

confidence: 99%

Thermal Cycloimidization Study of Polyimides and Poly(amide imide)s Synthesized from Low-Temperature Solution Polymerization

Dodda

Remiš

Martı́n

et al. 2015

Journal of Macromolecular Science, Part B

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Polyimides (PI)s and Poly(amide imide)s (PAI)s containing di/tri-structural arrangements of monomer constituents were synthesized from 1,2,4,5 benzenetetracarboxylic anhydride/3,3 0 ,4,4 0 benzophenonetetracarboxylic dianhydride, diamines and trimellitic dianhydride chloride, i.e., a mixture of dianhydrides and diamines, using low-temperature solution polymerization. The majority of the resulting polymers were readily soluble in polar aprotic solvents such as dimethylformamide, dimethylsulfoxide, dimethylacetamide, etc. Thermal cycloimidization studies by thermogravimetic analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) revealed that the rate of cycloimidization was much faster during the initial 15 min, and then occurred at much slower rates till the completion. The activation energies (Ea) for thermal cycloimidization of poly(amic acid)s was calculated from the rate of mass loss of the polymer heated at different temperatures according to the Coats and Redfern method. PI and PAIs derived from diamines containing single cyclic/benzene ring structures, such as mphenylenediamine and 1,3-cyclohexanebis(methylamine), showed less amount of char yield than those having two benzene rings and separated by methylene, sulfone, or ether linkages. The structure of both diamine and trimellitic chloride had a profound effect on the polymer chain mobility, as indicated by the big variation in the glass transition temperatures. Thermally stable polymers were developed into membranes and tested for their mechanical strength by dynamic mechanical analysis(DMA).

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General Methodology to Identify the Minimum Alphabet Size for Heteropolymer Design

Cardelli

Nerattini

Tubiana

et al. 2019

Advcd Theory and Sims

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Understanding how to design the structure of heteropolymers through their monomer sequence will have a significant impact on the creation of novel artificial materials. According to mean‐field theories, the minimum number—or alphabet—of distinct monomers necessary to achieve such designability is directly related to the conformational entropy ω of compact polymer structures. Here, a computational strategy to calculate this conformational entropy is introduced and thus predict the minimum alphabet to achieve designability, for a generalized heteropolymer model. The comparison of the predictions with previous results proves the robustness of the approach. It is quantified for the first time how the number of directional interactions is critical for achieving the designability. The methodology that is introduced can be easily generalized to models representing specific polymers. A comparison between conventional polymers monomers are provided, and it is predicted that polyurea, polyamide, and polyurethane residues are optimal candidates to be functionalized for the experimental synthesis of designable heteropolymers. As such, our method can guide the engineering of new types of self‐assembling modular polymers, that will open new possibilities for polymer‐based materials with unmatched versatility and control.

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Novel polyimide-b-polyurea supramacromolecule with remarkable thermomechanical and dielectric properties

Cited by 32 publications

References 50 publications

Polyimide–polyurea copolymer coating with outstanding corrosion inhibition properties

Polyimide–polyurea copolymer coating with outstanding corrosion inhibition properties

Thermal Cycloimidization Study of Polyimides and Poly(amide imide)s Synthesized from Low-Temperature Solution Polymerization

General Methodology to Identify the Minimum Alphabet Size for Heteropolymer Design

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