A Kinetic Study of the Mechanism of the Solid-State Reaction between Pyromellitic Dianhydride (PMDA) and Oxydianiline (ODA)

Dimitrakopoulos, Christos; Machlin, E.S.; Kowalczyk, S. P.

doi:10.1021/ma951728g

Cited by 20 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2, top), these modes are barely visible in the uncured vapor deposited film. These results, in accord with previous work [4], [6], suggest that as-deposited VDP material is a low-molecular weight mixture of partially reacted monomers.…”

Section: Introductionsupporting

confidence: 92%

Integration of vapor deposited polyimide into a multichip module packaging process

Liberman

Malba

Bernhardt

1997

IEEE Trans. Comp., Packag., Manufact. Technol. B

View full text Add to dashboard Cite

We report the first full integration of a vapordeposited polyimide dielectric into a multichip module (MCM) electronic packaging scheme. A robust high-throughput vapor deposition polymerization (VDP) of polyimide has been developed for an interconnection scheme in which thin film metal interconnects are patterned from the top of bare die, down the sides, and onto the substrate circuit board surface. VDP polyimides films have been extensively characterized using infrared spectroscopy and prism coupling techniques. The chemical and electrical properties of the VDP polyimide films are similar to commercially available spin cast polyimides.Index Terms-Infrared spectroscopy, multichip module, polyimide, refractive index, vapor deposition.

show abstract

Section: Introductionsupporting

confidence: 92%

Integration of vapor deposited polyimide into a multichip module packaging process

Liberman

Malba

Bernhardt

1997

IEEE Trans. Comp., Packag., Manufact. Technol. B

View full text Add to dashboard Cite

show abstract

“…These results indicate that PI fibers were successfully prepared. Besides, in ATR‐FTIR spectrum of BPDA/ODA PI fibers, stretching vibration peak of O is observed at 1240 cm −1 . In ATR‐FTIR spectrum of BPDA/DABA PI fibers, stretching vibration absorption of amide carbonyl locates at 1660 cm −1 , indicating the existence of amide bonds .…”

Section: Resultsmentioning

confidence: 92%

Effect of molecular rigidity and hydrogen bond interaction on mechanical properties of polyimide fibers

Yan

Luo

Huang

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

Six kinds of polyimide (PI) fibers with different molecular rigidity and hydrogen bond interactions were designed and prepared in order to investigate the relationship between structure and mechanical properties. The rigidity, aggregation structure, fracture morphology, hydrogen bond, and charge transfer (CT) interactions were investigated in detail. Conformational rigidity of six PI fibers were simulated and measured by D-values of energy barrier and bottom in potential energy curves of PI units. Rigid rodlike PI macromolecules tend to pack in order and show better mechanical properties. However, with the increase of D-values, fracture mechanisms change from ductile fracture to brittle fracture. Brittle fracture resulting from high conformational rigidity is adverse to improvement of mechanical properties of PI fibers. Besides, strength of hydrogen bond and CT interactions are characterized by infrared spectroscopy and ultraviolet absorption spectra, respectively. The results indicate that higher interactions lead to higher tensile strength and initial modulus. Finally, PI fibers, which possess moderate conformational rigidity and strong hydrogen bond interactions, exhibit highest tensile strength (1.82 GPa) and initial modulus (85.7 GPa) in six kinds of PI fibers.

show abstract

“…During the past three decades, since the commercialization of Kapton polyimide, an impressive variety of polyimides have been synthesized [258,259]. Polyimides possess outstanding key properties, such as thermooxidative stability [260], high mechanical strength [261], high modules, excellent electrical [262] and optical properties [263,264], and superior chemical resistance [265].…”

Section: Introductionmentioning

confidence: 99%

Laser Application of Polymers

Lippert

2004

Polymers and Light

150

View full text Add to dashboard Cite

Laser ablation of polymers has been studied with designed materials to evaluate the mechanism of ablation and the role of photochemically active groups on the ablation process, and to test possible applications of laser ablation and designed polymers. The incorporation of photochemically active groups lowers the threshold of ablation and allows high-quality structuring without contamination and modification of the remaining surface. The decomposition of the active chromophore takes place during the excitation pulse of the laser and gaseous products are ejected with supersonic velocity. Time-of-flight mass spectrometry reveals that a metastable species is among the products, suggesting that excited electronic states are involved in the ablation process. Experiments with a reference material, i.e., polyimide, for which a photothermal ablation mechanism has been suggested, exhibited pronounced differences. These results strongly suggest that, in case of designed polymers which contain photochemically active groups, a photochemical part in the ablation mechanism cannot be neglected. Various potential applications for laser ablation and the special photopolymers were evaluated and it became clear that the potential of laser ablation and specially designed material is in the field of microstructuring. Laser ablation can be used to fabricate three-dimensional elements, e.g., microoptical elements.Keywords Laser ablation · Ablation mechanism · Photopolymers · Polyimide · Spectroscopy This was not always true, of course. For many years, the laser was viewed as "an answer in search of a question". That is, it was seen as an elegant device, but one with no real useful application outside of fundamental scientific research. In the last two to three decades however, numerous laser applications have moved from the laboratory to the industrial workplace or the commercial market. Lasers are unique energy sources characterized by their spectral purity, spatial and temporal coherence, and high average peak intensity. Each of these characteristics has led to applications that take advantage of these qualities: -Spatial coherence: e.g., remote sensing, range finding and many holographic techniques. -Spectral purity: e.g., atmospheric monitoring based on high-resolution spectroscopies. -and of course the many other applications in communication and storage, e.g., CDs.All of these high-tech applications have come to define everyday life in the late twentieth century. One property of lasers, however, that of high intensity, did not immediately lead to "delicate" applications but rather to those requiring "brute force". That is, the laser was used in applications for removing material or heating. The first realistic applications involved cutting, drilling, and welding, and the laser was little more advanced than a saw, a drill, or a torch. In a humorous vein A.L. Schawlow proposed and demonstrated the first "laser eraser" in 1965 [4], using the different absorptivities of paper and ink to remove the ink without damaging the und...

show abstract

A Kinetic Study of the Mechanism of the Solid-State Reaction between Pyromellitic Dianhydride (PMDA) and Oxydianiline (ODA)

Cited by 20 publications

References 23 publications

Integration of vapor deposited polyimide into a multichip module packaging process

Integration of vapor deposited polyimide into a multichip module packaging process

Effect of molecular rigidity and hydrogen bond interaction on mechanical properties of polyimide fibers

Laser Application of Polymers

Contact Info

Product

Resources

About