Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

Abdollahi, Hossein; Salimi, Ali; Barikani, Mehdi; Samadi, Ali; Rad, S. Hosseini; Zanjanijam, Ali Reza

doi:10.1002/app.47121

Cited by 40 publications

(28 citation statements)

References 39 publications

(62 reference statements)

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“…The diagram shows characteristic bands corresponding to the amine groups at the wavenumbers of 3380, 1665, and 1600 cm -1 . The 3380 cm -1 band is responsible for the stretching vibrations of the N-H groups, while the 1665 and 1600 cm -1 bands are responsible for the bending vibrations of the N-H groups [44]. As the content of 1,3-diaminopropane increases, the intensity of the bands corresponding to the amine groups increases.…”

Section: Structure and Compositionmentioning

confidence: 98%

Structure, thermal and mechanical properties of copoly(ester amide)s based on 2,5‐furandicarboxylic acid

et al. 2021

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In this work, new bio-based copoly(ester amide)s were synthesized by a two-step melt polycondensation process, using 2,5-furanedicarboxylic acid dimethyl ester (DMFDC), 1,3-propanediol (PDO), and 1,3-diaminopropane (DAP), with different DAP content. The chemical structure of the obtained poly(trimethylene 2,5-furandicarboxylate)-co-poly(propylene furanamide) (PTF-co-PPAF) copolymers was confirmed by nuclear magnetic resonance (1H NMR) and Fourier-transform infrared (FTIR) spectroscopy. Gas chromatography/mass spectrometry was used to provide more details of the polycondensation process. Thermal properties of the obtained materials were characterized by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic–mechanical thermal analysis (DMTA). The copolymers were amorphous and their glass transition temperature increased with the increase in the poly(propylene furanamide) (PPAF) content. The synthesized PTF-co-PPAF copolymers exhibited improved thermal and thermo-oxidative stability up to 300 °C. In addition, from the performed mechanical tests, it was found that along with the increase in PPAF content, Young's modulus increased, while at the same time, the value of elongation at break decreased. Graphical Abstract

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Section: Structure and Compositionmentioning

confidence: 98%

Structure, thermal and mechanical properties of copoly(ester amide)s based on 2,5‐furandicarboxylic acid

et al. 2021

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“…Epoxy resins are widely used in a variety of applications from structural materials to modern devices due to their excellent thermal and mechanical properties [1][2][3] . Also, since there is a degree of freedom in selecting epoxy as the base resin and amine as the curing agent, it is possible to select an appropriate mixture suitable for the desired properties by combining them, which is another factor for widening the application [4][5][6][7][8][9][10][11][12] . In addition, as further properties and/or functions are desired on to the epoxy resin, a number of components are supposed to be mixed in it.…”

Section: Introductionmentioning

confidence: 99%

Molecular Size Effect on Curing Process for Epoxy and Amine Mixture

Yamamoto

Tanaka

2021

J. Soc. Rheol., Jpn

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The curing process of epoxy and amine mixtures was investigated from the viewpoint of molecular size of reactants via all-atom molecular dynamics simulation. Of four mixtures composed of either smaller or larger epoxy and amine molecules, the system of both smaller epoxy and amine reached the highest conversion at a given time, whereas the conversion for the combination of both larger epoxy and amine was the lowest. These can be explained in terms of their diffusion coeffi cients. In addition, the size effect on the reaction kinetics was more striking for epoxy than amine in the curing process. This was because epoxy reacted only once but amine did twice. When the primary amine reacted with epoxy, the resultant secondary amine was incorporated into the three-dimensional network. Hence, even if the primary amine had a higher mobility, the movement of the part after the reaction slowed down, making the further reaction to be the tertiary amine slow. Finally, it was shown that although the smaller epoxy reacted faster than the larger one in the mixed system of larger/smaller epoxy and amine, there was no difference in the reaction progress depending on the molecular size of amine.

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“…PEAs are commercially available with molecular weights ranging from 200 to 2,000 g/mol. Due to their unique flexibility and ease for conjugation, the PEAs have been extensively used as modifiers for a number of materials such as carbon fibers, and epoxy resins 13…”

Section: Introductionmentioning

confidence: 99%

<p>Cell-Penetrating And Antibacterial BUF-II Nanobioconjugates: Enhanced Potency Via Immobilization On Polyetheramine-Modified Magnetite Nanoparticles</p>

Perez¹,

Cifuentes²,

Cuellar³

et al. 2019

IJN

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IntroductionControlled delivery of therapeutic molecules in a localized manner has become an area of interest due to its potential to reduce drug exposure to healthy tissues and consequently to minimize undesirable side effects. We have recently introduced novel cell-penetrating vehicles by immobilizing the antimicrobial peptide Buforin II (BUF-II) on magnetite nanoparticles (MPNPs). Despite the potent translocating abilities of such nanobioconjugates, they failed to preserve the antimicrobial activity of native BUF-II. In this work, we explored immobilization on MNPs with the aid of polymer surface spacers, which has been considered as an attractive alternative for the highly efficient conjugation of various biomolecules.MethodsHere, we immobilized BUF-II on polyetheramine-modified magnetite nanoparticles to preserve its structural integrity. As a result, for the obtained nanobioconjugates the lost antimicrobial activity against gram-positive and gram-negative bacteria was only 50% with respect to the native BUF-II. The nanobioconjugates were also characterized via FTIR, DLS, TEM, and TGA. Delivery on THP-1, HaCaT, HFF, and Escherichia coli cells was conducted to confirm capability for cell membrane translocation.ResultsColocalization with Lysotracker showed an endosomal escape efficiency of about 73∓12% in THP-1 cells. Avoidance of endocytic pathways of internalization was qualitatively confirmed by a delivery assay at low temperature. Nuclear penetration of the nanobioconjugates was corroborated via confocal microscopy and showed high biocompatibility as demonstrated by hemolysis levels below 5% and acute cytotoxicity of around 15%.ConclusionThe obtained nanobioconjugates were capable of translocating the cell membrane and nuclei of different normal and cancerous cell lines without significantly decreasing viability. This makes the vehicle addressable for a number of applications ranging from antimicrobial topical treatments to the delivery of nucleotides and therapeutic molecules with difficulties to bypass cell membranes.

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Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

Cited by 40 publications

References 39 publications

Structure, thermal and mechanical properties of copoly(ester amide)s based on 2,5‐furandicarboxylic acid

Structure, thermal and mechanical properties of copoly(ester amide)s based on 2,5‐furandicarboxylic acid

Molecular Size Effect on Curing Process for Epoxy and Amine Mixture

<p>Cell-Penetrating And Antibacterial BUF-II Nanobioconjugates: Enhanced Potency Via Immobilization On Polyetheramine-Modified Magnetite Nanoparticles</p>

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