Ethynyl‐terminated polyethers from new end‐capping agents: Synthesis and characterization

Delfort, Bruno; Lucotte, Georges; Cormier, Laurent

doi:10.1002/pola.1990.080280918

Cited by 20 publications

(3 citation statements)

References 8 publications

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“…IR (neat on NaC1) : 3150,2950,1610,1480,1210 cm-'. 'H-NMR 6.70 (d, 2H), 6.79 (d, ZH), 7.10 (m, l H ) , 7.34 (m, l H ) , 9.28 (s, 1H). The procedure for the preparation of 4a was followed except 0.80 g (1.92 mmol) of 3d was used to give 0.47 g (86% yield) of 4d as an orange oil.…”

Section: 3-dimethyltriazene 4cmentioning

confidence: 99%

Self‐Crosslinkable poly(arylene ether)s containing pendent phenylenetriazene groups

Lau¹,

Vo²,

Fone³

et al. 1994

J. Polym. Sci. A Polym. Chem.

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Self‐crosslinkable poly(arylene ether)s 6, and 8, containing pendent triazene groups were prepared by nucleophilic substitution reaction of poly(arylene ether)s 5, and 7, respectively, with 1‐[4‐(4‐hydroxyphenoxy)phenylene]triazenes, 4, in the presence of potassium carbonate in N,N‐dimethylacetamide. A series of triazenes 4 containing various substituents have been synthesized. Self‐crosslinkable polymer 6e containing phenyl‐substituted triazene pendants can be crosslinked at 215°C, which is about 40°C lower than the glass transition temperature of the virgin base polymer 5. The degree of crosslinking can be tailored by varying the concentration of the pendent phenylenetriazene groups in the polymer. After curing, the flexible polymer films (ca. 10 μm thick) exhibit high gel contents, increased glass transition temperatures, improved resistance to organic solvents, and little change in dielectric constant and thermal stability. These self‐crosslinkable poly(arylene ether)s are potential candidates for electronic applications. © 1994 John Wiley & Sons, Inc.

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Section: 3-dimethyltriazene 4cmentioning

confidence: 99%

Self‐Crosslinkable poly(arylene ether)s containing pendent phenylenetriazene groups

Lau¹,

Vo²,

Fone³

et al. 1994

J. Polym. Sci. A Polym. Chem.

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“…An alternative method to produce covalently cross-linked polysulfones synthesized oligomers with telechelic end groups and then linked together chain ends into a network. One advantage of this approach is that oligomeric materials are more soluble and easily processed than their high molecular weight counterparts . Several oligomers have been synthesized including thermally curable ethynyl, , allyl, and propargyl end groups but with varying backbone structures and acidified forms for investigation as fuel cell materials.…”

Section: Introductionmentioning

confidence: 99%

“…One advantage of this approach is that oligomeric materials are more soluble and easily processed than their high molecular weight counterparts . Several oligomers have been synthesized including thermally curable ethynyl, , allyl, and propargyl end groups but with varying backbone structures and acidified forms for investigation as fuel cell materials. The first desalination studies with telechelic oligomers involved the cross-linking of phenoxide end groups with a tetrafunctional epoxide .…”

Section: Introductionmentioning

confidence: 99%

Cross-Linking Disulfonated Poly(arylene ether sulfone) Telechelic Oligomers. 1. Synthesis, Characterization, and Membrane Preparation

Sundell

Lee

Nebipasagil

et al. 2014

Ind. Eng. Chem. Res.

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meta-Aminophenol was used during nucleophilic step copolymerization to end-cap partially disulfonated bisphenol A based random copolymers with controlled oligomeric molecular weights. The amine end groups were thermally reacted with a tetrafunctional epoxy reagent to produce networks. Very high gel fractions, up to 99%, and ductile film formation were achieved. The oligomer was further functionalized with acryloyl chloride, phenylethynyl phthalic anhydride, and maleic anhydride to obtain several novel free radically cross-linkable oligomers. The structure and molecular weights (M n) were established with 1H NMR spectroscopy of the oligomers and end groups. TGA analysis demonstrated the high thermal stability of these oligomers; DSC investigations showed that the oligomers had curing exotherms from 140 to 330 °C and that residual casting solvent during cross-linking was necessary to avoid vitrification during membrane formation. In addition to the thermally cross-linkable systems, photocross-linking was demonstrated with the telechelic acrylamide functionalized oligomers. Two compositions were identified as potential candidates for further development. Cross-linking disulfonated poly(arylene ether sulfone) copolymers limits the high water sorption and swelling of these hydrophilic materials, which enhances several properties for membrane applications. Initial transport results indicate that cross-linking greatly reduces salt permeability while modestly decreasing water permeability, resulting in improved water/NaCl selectivity.

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Behavior of volatile depletion for LaRC™‐PETI‐5 amide acid/N‐methylpyrrolidinone solution

Hou

Costen

2003

J of Applied Polymer Sci

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ABSTRACT:The fabrication of composites from polyimide precursors (polyamide acids) that involve condensation reactions requires the removal of volatiles (solvent and reaction by-products) prior to consolidation in order to achieve a void-free laminate. Volatile removal is commonly accomplished with a B-stage processing step. In this study, a PETAA/NMP (phenylethynyl terminated amide acid in Nmethylpyrrolidinone) solution and prepreg were characterized using therogravimetric analysis (TGA) and microdielectrometry. A master weight loss profile was constructed by superimposing measurements at various heating rates. The TGA results correlated well with the dielectric ionic conductivities. Under the same thermal conditions, volatiles were depleted at slower rates from the wet prepreg than the neat resin solution. Dielectric properties were more sensitive to the residual volatile contents than the TGA measurements in both the neat resin and wet prepreg. Dielectric sensing technology was demonstrated to be a feasible tool for future volatile management in the fabrication of PETI composites. This study demonstrates that the combination of TGA and dielectrometry provides useful information to develop proper processing conditions for composite fabrication from prepregs containing volatiles.

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Ethynyl‐terminated polyethers from new end‐capping agents: Synthesis and characterization

Cited by 20 publications

References 8 publications

Self‐Crosslinkable poly(arylene ether)s containing pendent phenylenetriazene groups

Self‐Crosslinkable poly(arylene ether)s containing pendent phenylenetriazene groups

Cross-Linking Disulfonated Poly(arylene ether sulfone) Telechelic Oligomers. 1. Synthesis, Characterization, and Membrane Preparation

Behavior of volatile depletion for LaRC™‐PETI‐5 amide acid/N‐methylpyrrolidinone solution

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