Adhesive evaluation of water-soluble LARC-TPI

Progar, D. J.; Pike, R. A.

doi:10.1016/0143-7496(88)90054-1

Cited by 16 publications

(6 citation statements)

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“…PI can be processed from water by making intermediate PAA precursor water-soluble. There are different ways of making water-soluble PAA, i.e., using special starting monomers with ionic moieties or by reaction with an amine converting PAA to its carboxylate salt (PAA-salt). − Amines only with short alkyl chains such as N , N -dimethylethanol amine, triethylamine (Et 3 N), provide water solubility to PAA whereas long alkyl chains make PAA hydrophobic and insoluble in water. , Membranes made from water-soluble PAA-salt precursor show gas permeation characteristics similar to those of the corresponding membranes from organic solvents . PAA-salt precursors were used for making composite fibrous membranes with SiO 2 or Al 2 O 3 in DMAc as the use of PAA-salt precursor offers other advantages such as better hydrolytic stability and low thermal imidization temperature …”

Section: Introductionmentioning

confidence: 99%

Polyimide Nanofibers by “Green” Electrospinning via Aqueous Solution for Filtration Applications

Jiang

Hou

Agarwal

et al. 2016

ACS Sustainable Chem. Eng.

133

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The use of large amounts of environmentally unfriendly, toxic, and flammable organic solvents in electrospinning of polymers puts demand on the development of new methods and formulations for making water stable hydrophobic nanofibers from water-soluble precursor solution. Electrospun polyimide (PI) nanofibers are of particular interest for a variety of applications due to their extraordinary thermal and chemical stability. However, the intermediate precursor of polyimide, the polyamic acid (PAA) has to be electrospun from harmful solvents like dimethylformamide (DMF) which is a serious obstacle for technical applications of electrospun PI. This work highlights the formation of PI nanofibers by “green” electrospinning of ammonium salts of PAA from water. The high temperature used for imidization in the second step also removed ammonia and the template polymer by sintering giving PI nanofibers with diameter 295 ± 58 nm. The thus obtained PI nanofibers by “green” electrospinning were defined as “green” PI nanofibers. Aerosol filtration of “green” PI nanofibers showed a performance that was very similar to PI nanofibers obtained by electrospinning of PAA from DMF. Additionally, it has been shown that the “green” PI nanofibers were suitable for the filtration of hot oil as well.

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Section: Introductionmentioning

confidence: 99%

Polyimide Nanofibers by “Green” Electrospinning via Aqueous Solution for Filtration Applications

Jiang

Hou

Agarwal

et al. 2016

ACS Sustainable Chem. Eng.

133

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“…The adhesive specimens were prepared under a variety of bonding conditions and tested at a series of temperatures. These test results were compared with data previously reported for LARC-TPI [4].…”

Section: Introductionmentioning

confidence: 94%

“…[4]). Ti-6AI-4V panels were grit-blasted with 120 grit aluminum oxide, washed with methanol, and subjected to a Pasa-Jell 107* treatment to form a stable oxide on the surface.…”

Section: Adhesive Tapementioning

confidence: 99%

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Initial evaluation of novel polyamide-imides and their copolymers as adhesives

Progar

Dezern

1989

Journal of Adhesion Science and Technology

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Abstract�An adhesive screening study was performed at NASA Langley Research Center on two linear aromatic polyamide-imide (PAI) homopolymers and two linear aromatic PAI copolymers. The homopolymers were made with either of two amide diamines, 3,3'-or 4,4'-diaminobenzanilide (DABA), and 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA). The two copolymers studied were prepared with a combination of 3,3'-DABP and amide diamines. These aromatic PAIs possess high thermal stability because of intermolecular hydrogen bonding and chain stiffness.Lap shear strength (LSS) tests, conducted at room temperature, 177, 204 and 232°C, were the primary criterion for evaluation of the polymers as adhesives. Included in the study were measurements of the glass transition temperature made on fractured specimens for each bonding condition and a visual determination of the type of bond failure for specimens at each test temperature.Of the four adhesive candidates investigated, the best LSS values were obtained with the PAI copolymer identified as LARC-TPI(25% 3,3'-DABA). However, the LSS values were higher for the LARC-TPI polyimide with which the adhesive strengths were compared. The combination of a high molecular weight and the increased interchain electronic interaction associated with the amide group appears to contribute to the poor flow properties observed.

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“…A water-soluble precursor of an aromatic polyimide was first synthesized from a poly(amic acid) solution in diglyme treated with dimethyl ethanol amine. This indirect preparation gave an amine salt precursor, which was thermally converted to polyimide (9).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new water‐soluble precursors of polyimides

Clemenson

Pandiman

Pearson

et al. 1997

Polymer Engineering & Sci

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We have successfully synthesized and characterized new water‐soluble precursors of polyimides based on dianhydrides with diaminobenzene sodium sulfonate (DABSS) and diaminostilbene disodium sulfonate (DASBDSS). The precursors are soluble in water and methanol as well as in several aprotic solvents. The optimum inherent viscosities of the poly(amic acids), obtained by varying reaction temperatures, were measured using a conventional Ubbelohde viscometer. The average molar mass of the polymers expressed as the “poly(ethylene oxide)‐PEO/poly(ethylene glycol)‐PEG equivalent” molecular masses obtained by gel permeation chromatography (GPC) showed significant broad molecular mass distributions with their polydispersities ranging from 2.9 to 4.6. FT‐IR spectra revealed complete imidization of the polyimides. Their thermal properties were studied by techniques such as differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Polyimides derived from the dianhydrides and DASBDSS showed better thermal stability up to 40°C in nitrogen than in oxygen atmosphere. However, polyimides based on the dianhydrides and DABSS were slightly more stable in oxygen than in nitrogen atmosphere. In oxygen, all the synthesized polyimides exhibited weight losses of about 50% in the range of 450–510°C. The overall weight losses of these polyimides under nitrogen were less than 50% at 700°C. New network polymellitimides based on mellitic trianhydride (MTA) and DABSS, and co‐polymellitimides based on MTA, DABSS, and ODA (oxydianiline) were also synthesized and characterized successfully. Their thermal stabilities were compared with the linear polyimides using TGA and DSC.

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Adhesive evaluation of water-soluble LARC-TPI

Cited by 16 publications

References 1 publication

Polyimide Nanofibers by “Green” Electrospinning via Aqueous Solution for Filtration Applications

Polyimide Nanofibers by “Green” Electrospinning via Aqueous Solution for Filtration Applications

Initial evaluation of novel polyamide-imides and their copolymers as adhesives

Synthesis and characterization of new water‐soluble precursors of polyimides

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