Journal ArticleDOI
End-functionalized thermoplastic-toughened phthalonitrile composites: influence on cure reaction and mechanical and thermal properties
TLDR
In this paper, the feasibility of toughening novolac-phthalonitrile (NPN) resins using chemically modified poly(ether ether ketone) (PEEK).Abstract:
Phthalonitrile polymers are known for their high thermal stability and good mechanical properties. However, their brittle nature limits their application as structural composites in many critical areas. The present study investigates the feasibility of toughening novolac–phthalonitrile (NPN) resin using chemically modified poly(ether ether ketone) (PEEK). A telechelic PEEK bearing a phthalonitrile end group (PEEKPN) was synthesized via nucleophilic substitution of nitrophthalonitrile with the corresponding phenol–telechelic poly(ether ether ketone) (PEEKOH). Different compositions of NPN and PEEKOH–PEEKPN blends with curing agent, i.e. diaminodiphenylsulfone, were investigated for their cure behaviour and mechanical properties of their carbon fabric composites. In NPN–PEEKOH blends, crosslinking of the phthalonitrile groups was facilitated by phenol-mediated reactions resulting in the reduction of cure temperatures by around 130 °C with substantial improvement in thermal stability. Blending the resin with the thermoplastic enhanced the mechanical properties of the composites. The apparent flexural strength and impact strength of carbon fabric-reinforced composites were improved by more than 200 and 150%, respectively, on incorporation of 20 wt% PEEKOH in the NPN matrix. However, higher concentration of PEEKOH had a detrimental effect on the properties. Substitution of phenol end groups by phthalonitrile moieties led to integration of the PEEK moieties with the NPN matrix. However, it was not as conducive as PEEKOH for improving the matrix properties. The better performance of PEEKOH is attributed to the formation of polar heterocyclic groups like isoindoline by way of the phenol–nitrile reaction. © 2014 Society of Chemical Industryread more
Citations
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Thermal and mechanical properties enhancements obtained by reinforcing a bisphenol‐a based phthalonitrile resin with silane surface‐modified alumina nanoparticles
Mehdi Derradji,Noureddine Ramdani,Zhang Tong,Jun Wang,Lin-dan Gong,Xiaodong Xu,Zai-wen Lin,Abdelkhalek Henniche,H.K.S. Rahoma,Wen-bin Liu +9 more
TL;DR: In this paper, a new type of nanocomposites based on a high performance bisphenol-A phthalonitrile resin and surface-modified alumina nanoparticles was prepared by a hot compression molding technique.
Journal ArticleDOI
Enhanced thermal properties of phthalonitrile networks by cooperating phenyl-s-triazine moieties in backbones
TL;DR: In this paper, a two-step, one-pot reaction was used to obtain high glass transition temperatures at around 400°C and outstanding thermo-oxidative stability with weight retention of 95% ranging from 539°C to 552°C, suggesting an improvement of thermal properties imposed by phenyl-s-triazine units.
Journal ArticleDOI
One component propargyl phthalonitrile novolac: Synthesis and characterization
TL;DR: In this paper, a number of copolymers bearing varying proportions of propargyl and phthalonitrile groups on the same backbone and capable of self and co-curing to a thermally stable matrix have been synthesized.
Journal ArticleDOI
Phthalonitrile-Terminated Silicon-Containing Oligomers: Synthesis, Polymerization, and Properties
TL;DR: In this article, a silicon-containing phthalonitrile-terminated fluorene-based oligomer was synthesized by a novel method, and the structure was characterized by Fourier transfrom infrared spectroscopy, 1H NM.
Journal ArticleDOI
Studied on mechanical, thermal and dielectric properties of BPh/PEN-OH copolymer
TL;DR: In this paper, a copolymer 4,4′-bis(3,4-dicyanophenoxy)biphenyl (BPh) was modified with the hydroxyterminated poly(aryl ether nitrile) (PEN-OH).
References
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Book
Advanced Organic Chemistry: Reactions, Mechanisms, and Structure
TL;DR: Localized Chemical bonding Delocalized Chemical Bonding Bonding Weaker than Covalent Stereochemistry Carbocations, Carbanions, Free Radicals, Carbenes and Nitrenes Mechanisms and Methods of Determining them Photochemistry Acids and Bases Effects of Structure on Reactivity Aliphatic Nucleophilic Substitution Aromatic Electrophilic Substitutes Aliphatically Electrophilic Substitution Free-Radical Substitution Addition to Carbon-Carbon Multiple Bonds Adding to Carbon Hetero Multiple Bonds Eliminations Rearrangements Ox
Journal ArticleDOI
Synthesis and characterization of sulfonated poly(ether ether ketone) for proton exchange membranes
Peixiang Xing,Peixiang Xing,Gilles P. Robertson,Michael D. Guiver,Serguei D. Mikhailenko,Keping Wang,Serge Kaliaguine +6 more
TL;DR: In this article, a series of sulfonated poly(ether ether ketone)s (SPEEKs) were prepared by sulfonation of commercial Victrex ® and Gatone ® PEEK for a comparative study of proton exchange membranes (PEM) intended for fuel cell applications.
Journal ArticleDOI
Syntheses and characterization of heteroatom-bridged metal-free phthalocyanine network polymers and model compounds
TL;DR: In this paper, le polymeres et composes modeles ont une resistivite electrique elevee and ne peuvent etre dopes par l'iode.
Journal ArticleDOI
Synthesis and properties of a bisphenol A based phthalonitrile resin
TL;DR: In this article, a multiple aromatic ether linked phthalonitrile was synthesized and characterized, which exhibited good structural integrity upon heating to elevated temperatures and exhibited excellent thermal properties along with long-term oxidative stability.
Journal ArticleDOI
Phthalonitrile cure reaction with aromatic diamines
Satya B. Sastri,Teddy M. Keller +1 more
TL;DR: In this paper, a sulfone-containing diamine, bis[4-(4-aminophenoxy)phenyl] sulfone (p-BAPS), was used for phthalonitrile cure.