Dielectric and Chemical Characterization of the Polyimide, LARC-160

Kranbuehl, David E.; Delos, S. E.; Jue, P. K.; Schellenberg, Roman

doi:10.1007/978-1-4615-7637-2_14

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…The early reports of the use of DRS for cure monitoring of thermosetting systems were reviewed by Senturia and Sheppard [1,2] and were extended by them [1][2][3][4][5] to show how changes of permittivity and loss factor of samples contained in parallel-plate cells, or on the surface of specially designed planar dielectric sensors, provided a direct means of monitoring the curing of thermosets. At that time Kranbuehl and co-workers (see references [6][7][8][9][10] and references therein) also developed a continuous dielectric cure-monitoring procedure for epoxide-amine thermosets, polyimide resins and epoxide composites and epoxy laminates. The parameters governing ionic and dipolar mobility changed with time and were used to measure and control the cure-processing parameters under different experimental polymerization conditions including curing in an autoclave.…”

Section: Background Literaturementioning

confidence: 99%

“…The parameters governing ionic and dipolar mobility changed with time and were used to measure and control the cure-processing parameters under different experimental polymerization conditions including curing in an autoclave. The work of Senturia and Sheppard [1][2][3][4][5] and Kranbuehl and co-workers [6][7][8][9][10] showed that dielectric cure monitoring was of direct value as regards commercial thermosetting systems. Subsequently, Johari and co-workers (see references [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and references therein) made systematic studies of the time evolution of ε and ε during the polymerization of a wide range of epoxide-amine systems.…”

Section: Background Literaturementioning

confidence: 99%

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Real-time dielectric studies of polymerizing systems

Williams

Smith

Holmes

et al. 1999

J. Phys.: Condens. Matter

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The use of real-time dielectric relaxation spectroscopy (DRS) for monitoring changes in molecular mobility during reaction for thermosetting systems is described together with phenomenological and molecular theories of the time-dependent relaxation functions that are involved. Reduced molecular mobility normally leads to the diffusion control of a reaction and ultimately to glass formation at the polymerization temperature . We present new DRS results for a boroxine/epoxide system that show glass formation below a `floor temperature' and very different behaviour above , when the dielectric properties become independent of time and an elastomer is formed.

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Section: Background Literaturementioning

confidence: 99%

Section: Background Literaturementioning

confidence: 99%

Real-time dielectric studies of polymerizing systems

Williams

Smith

Holmes

et al. 1999

J. Phys.: Condens. Matter

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“…That portion of resistivity which was recovered was attributed to thermal effects. 29 It can be seen from Fig. 4 that there is some recovery of the original resistivity; however, the final resistivity upon cooling is significantly less than the original.…”

Section: Resultsmentioning

confidence: 88%

The Corrosion Behavior of Bimetallic Couples of Cu, Cr, and Ni in Polyamic Acid under Imidizing Conditions

Taylor

Doyle

Johnson

et al. 1993

J. Electrochem. Soc.

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Polyamic acid is known to release water and possibly ions during imidization. In addition, it is a strong organic acid which can react with basic metal oxide surfaces. Consequently, questions are raised as to whether significant integrated circuit (IC) line corrosion and, in particular, galvanic corrosion occur during the initial stages of IC manufacture. This study examined the corrosion behavior of Cu, Cr, and Ni in a solution of polyamic acid (PI 2525) and solvent (T9039) at room and elevated temperature, as well as Cu-Ni, Cu-Cr, and Cr-Ni galvanic couples. The anode-cathode relationships of the galvanic couples at room and elevated temperature were predictable from open-circuit behavior. Measured galvanic currents for some of the couples predicted significant material loss, particularly in the case of IC dimensions. Questions as to whether any of the anodic current might be partitioned into oxidation of the solvent or polyamic acid were answered by atomic absorption of solvent and polyamic acid/solvent solutions following potentiostatic, galvanostatic, and open-circuit experiments. Copper ion concentrations measured ion solution were higher than those predicted by Faraday's law suggesting an additional mechanism such as chemical dissolution.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.210.126.199 Downloaded on 2015-06-03 to IP

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“…Furthermore, DDA is probably the only convenient experimental technique for studying the cure process continuously, that is, to monitor the resin's curing throughout the process of going from a monomeric liquid of varying viscosity to a cross-linked, insoluble solid. Correlation of the wide variation in magnitude of the complex permittivity with both frequency and state of cure, coupled with chemical characterization work, have been used to determine resin quality, composition and age; cure cycle window boundaries; onset of flow and point of maximum flow; extent of and completion of reaction ; evolution of volatiles; Tg ; molecular-weight buildup and cross-linking [1][2][3][4][5].…”

Section: Introduction Nsaturated Polyester Resins Are Extensively Usementioning

confidence: 99%