A novel, facile and straightforward approach to achieve high-performance and efficient utilization of sustainable tyrosine cyclic peptide

He, Xiancong; Chen, Menghao; Wu, Hao; Liao, Shenjun; Hu, Jianghuai; Zeng, Ke; Ye, Gang

doi:10.1016/j.polymer.2021.123417

Cited by 5 publications

(4 citation statements)

References 63 publications

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“…Either of triazine (1370 cm À1 ) and isoindoline (1090 cm À1 ) absorption for PIPN-1-300 and PIPN-2-300 can be observed. 48,49 However, the characteristic absorption of triazine and isoindoline of pre-cured resins can't be quantified straightly, due to overlap of the absorption of the imide structure (1370 cm À1 ) and aromatic ether bond (1090 cm À1 ) of the oligomers. 20,50,51 Therefore, the conversion of cyano group, triazine and isoindoline of the resins was obtained by normalization method based on FTIR results, which calculates the intensity variation of the groups.…”

Section: Thermal Behaviors and Curing Behaviors Of Phthalonitrile Oli...mentioning

confidence: 99%

Synthesis of oligomeric phthalonitrile resins containing imide units and study of the methylene-cyano thermal synergistic polymerization effect

Xie

et al. 2022

High Performance Polymers

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The meta- and para-catenated methylene-containing phthalonitrile oligomers were prepared from the reaction of an excess amount of 4,4′-(4,4′-isopropylidenediphenoxy) bis-(phthalic anhydride) (BPADA) with 4,4′-Methylenedianiline (MDA) in a N, N-dimethylformamide/ toluene solvent mixture, followed by end-capping agent with 4-nitrophthalonitrile or 4-phenoxyaniline in a two-step, one-pot reaction. Differential scanning calorimetry (DSC) showed that both PN oligomers exhibited low softening points. The self-catalyzed curing reactivity of the PN oligomers was confirmed by the isothermal rheological measurements. Fourier transform infrared spectroscopy (FTIR) and ultraviolet and visible spectrophotometry (UV–Vis) data of the pre-curing resins were employed to investigate the chemical structure of the pre-cured resins, suggesting that oligomers generated crosslinking sites, including triazine, isoindoline, and phthalocyanine. The results further confirmed the self-catalyzed curing reactivity of the oligomers. Thermal properties were investigated by dynamic mechanical analysis (DMA) and thermal gravimetric analysis (TGA), demonstrating good thermal properties of the cured resins. The glass transition temperatures (Tgs) of PIPN-1-325, PIPN-1-350, PIPN-1-375 were in the range of 285–345°C, the 5% weight loss temperature (T5%) was observed at 482°C. The PIPN-2-325, PIPN-2-350, PIPN-2-375 showed Tgs ranging from 293 to 370°C, and T5% of the resins were in the range of 481–501°C. Then the isothermal rheological results of model compound and PN oligomers implied that the curing process of PN oligomers was closely related to the methylene-cyano radical thermal synergistic polymerization (TSP) effect proposed in our previous research, and then a revised curing mechanism (radical TSP mechanism) was proposed.

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Section: Thermal Behaviors and Curing Behaviors Of Phthalonitrile Oli...mentioning

confidence: 99%

Synthesis of oligomeric phthalonitrile resins containing imide units and study of the methylene-cyano thermal synergistic polymerization effect

Xie

et al. 2022

High Performance Polymers

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“…As is wellknown, aromatic units are crucial for maintaining the thermal performance of polymers. 47 Therefore, the introduction of biobased aromatic raw materials to high-performance biobased thermosets is currently a major challenge.…”

Section: Introductionmentioning

confidence: 99%

“…In order to further develop a source of biomass raw materials, we still expect to strengthen the work of preparing high-performance biomass thermosetting plastics. As is well-known, aromatic units are crucial for maintaining the thermal performance of polymers . Therefore, the introduction of biobased aromatic raw materials to high-performance biobased thermosets is currently a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Vanillin- and Isovanillin-Based Phthalonitrile Resins Containing Spirocycle Acetal Structures

Li,

Sun,

Yin

et al. 2023

ACS Appl. Polym. Mater.

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Preparing biobased high-performance thermosetting resins is one of the most important factors for sustainable development. In this work, two kinds of phthalonitrile resins containing spirocycle acetal structures were synthesized from pentaerythritol and renewable vanillin and isovanillin by an efficient two-step process. The structures of vanillin-and isovanillin-based phthalonitrile (VPN and IVPN) monomers were characterized by Fourier transform infrared (FTIR), NMR, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and elemental analysis. The curing behaviors of these monomers were studied by differential scanning calorimetry and FTIR. The thermal stability and dynamic mechanical properties of the cured resins were investigated by thermogravimetric analysis and dynamic mechanical thermal analysis. The processing properties were studied by a rheological analysis. Compared with traditional petroleum-based phthalonitrile resins such as bisphenol A and bisphenol, cured VPN and IVPN resins exhibited good thermal stability and thermomechanical properties, high glass transition temperature (T g ), and excellent processability.

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“…They're made utilizing a two-step, onepot nucleophilic displacement reaction involving activated or inactivated Di haloaromatic compounds and a suitable bisphenol, followed by 4-nitrophthalonitrile end-capping. The low melting temperatures of the second-generation PN resins allow them to be processed at far lower temperatures than the first-generation PN resins [9,10]. Given the unique physical properties of PN resin, we decided to use the solution of phthalonitrile (Benzene-1,2-dicarbonitrile) to impregnate cotton fabrics to ascertain its suitability as flame retardant based on parameters such as add-on, after flame time, after-glow time, ignition time, and char formation [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Phthalonitrile and Alum on Flame Retardation Properties of 100% Cotton Fabric

et al. 2022

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Speculations have it that phthalonitrile imparts flame retardancy on substrates. This study aimed to investigate the activities of phthalonitrile as flame retardant on 100% cotton fabric. The fabric samples tested were cut into 25:4 x 7 cm pieces, scoured, dried, and weighed. They were then impregnated with different concentrations of phthalonitrile in different solvents (benzene and acetone) and emulsion alongside alum dissolved in water. At the same time, the untreated fabric was used as a control. All the impregnated pieces of fabric were dried at room temperature and reweighed. The fabrics were subjected to add-on%, after flame time, after-glow time, and % char formation tests. The results showed that cotton-tested flame retardant properties increase with the increase in the concentration of phthalonitrile. Phthalonitrile has flame retardant properties on 100% cotton fabric.

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A novel, facile and straightforward approach to achieve high-performance and efficient utilization of sustainable tyrosine cyclic peptide

Cited by 5 publications

References 63 publications

Synthesis of oligomeric phthalonitrile resins containing imide units and study of the methylene-cyano thermal synergistic polymerization effect

Synthesis of oligomeric phthalonitrile resins containing imide units and study of the methylene-cyano thermal synergistic polymerization effect

Vanillin- and Isovanillin-Based Phthalonitrile Resins Containing Spirocycle Acetal Structures

Effect of Phthalonitrile and Alum on Flame Retardation Properties of 100% Cotton Fabric

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