Modification of PETI-5K Imide Oligomers: Effect on Viscosity

Simone, Christopher D.; Scola, Daniel A.

doi:10.1177/09540083030154006

Cited by 14 publications

(3 citation statements)

References 22 publications

(29 reference statements)

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“…PEPI is utilized to end-cap aromatic heterocyclic oligoimides. Upon heating, phenylethynyl undergos polymerization and cross-linking reactions to form thermosets. − The cure reaction of PEPI has been studied using solid state carbon NMR and infrared spectroscopy. These studies suggest that PEPI reactions proceed initially by polyene formation, followed by branching and cyclization reactions. − Several kinetic studies of oligoimides end-capped with PEPI and model PEPI compounds have shown first-order kinetics for the initial polyene reactions, with a CC conversion of under 80%. , The kinetics deviate when the slow, diffusion controlled cyclization and cross-linking chemistries occur.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transitions and Reaction Kinetics of Polyhederal Silsesquioxane containing Phenylethynylphthalimides

et al. 2010

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Thermal transitions and reaction kinetics of polyhedral oligomeric silsesquioxane (POSS) with phenylethynylphthalimide (PEPI) moieties were investigated. Specifically, this study was designed to probe the influence of the POSS peripheries, types of spacer group in between the PEPI and the SiO 1.5 core, the architecture of the PEPI arrangement with respect to the SiO 1.5 core, and the number of PEPI groups per cage on the thermal transitions and the cross-linking reaction of phenylethynyl. PEPI-POSS compounds with isobutyl peripheries exhibited lower melting temperatures as compared to those with phenyl periphery, consequently these isobutyl PEPI-POSS derivatives have a higher phenylethynyl reaction rate, although the onset of reaction temperature was not significantly affected. Changing the spacer group from propyl to phenyl causes an increase in the melting transition temperature along with a higher heat of fusion at melting; however, the more rigid phenyl spacer enables the PEPI-POSS to form a higher degree of crystallinity upon cooling. The more rigid phenyl spacer also initiates the polyene reactions at lower temperatures. For POSS with PEPI attached to either side of the cage, there are two isomers with respect to the SiO 1.5 core. This mixture of two isomers inhibits the formation of crystallinity as compared with the "pendent" derivative where both PEPI groups come off from the same corner of POSS cage. Finally, it was found that these PEPI-POSS molecules have reaction kinetics and onset temperatures on par with organic hexafluorophenylethynyl oligoimides, which make these PEPI-POSS molecules excellent candidates as nanocomposite additives in high performance composite applications.

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Section: Introductionmentioning

confidence: 99%

Thermal Transitions and Reaction Kinetics of Polyhederal Silsesquioxane containing Phenylethynylphthalimides

et al. 2010

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“…13 C‐PEPA was synthesized according to a published procedure 24. 4,4′‐Bis[(4‐phenylethynyl)phthalimide] phenoxy phenyl‐2,2′‐hexafluoroisopropylidene (PEPA‐4‐BDAF), was synthesized according to a published procedure 26…”

Section: Methodsmentioning

confidence: 99%

Free radical initiated low temperature crosslinking of phenylethynyl (PE) end‐capped oligomides

Gong

Luo

et al. 2010

J. Polym. Sci. A Polym. Chem.

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A relatively low-temperature crosslinking method for phenylethynyl (PE) end-capped oligomides was developed. PE end-capped oligomides are typically cured into crosslinked polyimides at 370 C for about 1 h. The addition of a low viscosity mixed-solvent of N-methylpyrrolidinone (NMP)/dimethyl ether of polyethylene glycol (M ¼ 250 g/mol), NMP/DM-PEG-250, or NMP/polyethylene glycol (M ¼ 400 g/mol), NMP/PEG-400, as film forming medium for PE-end-capped oligomides was investigated. Fourier transform infrared spectroscopy and 13 C NMR showed that the mixed solvent addition was effective for achieving low-temperature crosslinking of the ethynyl endcaps over the temperature range 200-250 C. The low temperature crosslinking process was explained by thermolysis of the PEG molecules over this temperature range forming free radical species such as $CH 2 CH 2 OÁ or $CH 2 CH 2 Á which initiate cure of the ethynyl groups resulting in a cross linked polyimide membrane. The PEG solvents also provide a radical source for the degradation polymerization of the solvents to a water and NMP insoluble polymer, which formed a miscible blend with the crosslinked membrane. Glass transition temperature (differential scanning calorimetry) data and thermo gravimetric analysis data provide evidence for the miscible blend.

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“…1,2 They could be used as substitutes for the widely used thermosetting composites in aerospace and automobile applications. 3 Thus far, fiber-reinforced engineering plastics, such as poly(ether ether ketone), 4 polyimide (PI), 5,6 and poly(phenylene sulfide), 7,8 have been extensively researched due to their excellent mechanical properties, heat stability, and chemical resistance. However, there are few published reports on the effects of molecular weight on the properties of composites, and these works focused mostly on the effect of temperature, additional modifiers, and aging on the mechanical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of molecular weight on the dynamic mechanical properties and interfacial properties of carbon fiber fabric-reinforced polyetherketone cardo composites

Ying

Zhang

et al. 2016

High Performance Polymers

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It's a long-standing task to explore the toughening effect of fiber-reinforced thermoplastic composites, which could be used to produce new materials demanded by the aerospace field. In this work, we investigated the effects of the molecular weight of a thermoplastic resin, polyetherketone cardo (PEK-c), on the thermal, mechanical, and interfacial properties of the composite. Carbon fiber fabrics reinforced with PEK-c composite laminates were prepared by solution-processed prepreg and hot press molding. Scanning electron microscopic results showed that the fibers were distributed uniformly in the resin, with no visible flaws detected. The results of the dynamic mechanical analysis revealed that, according to the lower mobility of the polymer chain, the glass transition temperature of composite laminates increased with the increase in molecular weight. However, the tan values showed a lower peak value with a higher molecular weight due to the improved interfacial property between the resin and the fiber. The results on interlaminar shear strength also indicate that composites with resins of higher molecular weight have better interfacial adhesion. These results are closely interrelated with and contribute to our overall understanding of the effects of molecular weight on the properties of CFRP composites.

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Modification of PETI-5K Imide Oligomers: Effect on Viscosity

Cited by 14 publications

References 22 publications

Thermal Transitions and Reaction Kinetics of Polyhederal Silsesquioxane containing Phenylethynylphthalimides

Thermal Transitions and Reaction Kinetics of Polyhederal Silsesquioxane containing Phenylethynylphthalimides

Free radical initiated low temperature crosslinking of phenylethynyl (PE) end‐capped oligomides

Effects of molecular weight on the dynamic mechanical properties and interfacial properties of carbon fiber fabric-reinforced polyetherketone cardo composites

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