Synthesis and Properties of Partially Fluorinated Polyimides for Optical Applications

Matsuura, Takeshi; Ando, Shinji; Sasaki, S.

doi:10.1007/0-306-46919-7_15

Cited by 7 publications

(10 citation statements)

References 43 publications

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“…Such properties inhibit noncovalent inter‐ and intramolecular chain interactions, chain ordering, and crystallinity and thus allow the realization of polyimides with solid mechanical properties and good solubility in both the poly(amic acid) and polyimide forms while maintaining the excellent thermooxidative stability of traditional aromatic polyimides. Additionally, isopropylidene groups lead to reduced surface free energy, increased fractional free volumes, increased diffusion coefficients, reduced moisture absorptivity, reduced permittivity, reduced refractive index, and markedly reduced absorptivity in the visible region of the EM spectrum 81–87. Indeed, 6FDA/4‐BDAF is one of several fluorinated polyimides often called colorless 88…”

Section: Resultsmentioning

confidence: 99%

Treatment recommendations for primary extradural meningiomas

Mattox

Hughes

Oleson

et al. 2010

Cancer

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Highly reflective, surface‐metalized, flexible polyimide films were prepared by the incorporation of a soluble silver‐ion complex, (hexafluoroacetylacetonato)silver(I) (AgHFA), into dimethylacetamide solutions of poly(amic acid) prepared from 2,2‐bis(3,4‐dicarboxyphenyl)hexafluoropropane dianhydride and 2,2‐bis[4‐(4‐aminophenoxy)phenyl]hexafluoropropane. The thermal curing of solution‐cast silver(I)–poly(amic acid) films to 300°C led to cycloimidization of the amic acid with concomitant silver(I) reduction and the formation of a reflective, air‐side‐silvered surface at very low (2 wt % and 0.3 vol %) silver concentrations. The reflective surface evolved only when the cure temperature reached about 275°C, although X‐ray diffraction showed metallic silver in the hybrid film by 200°C. After a maximum specular reflectivity greater than 80% was achieved for the 2 wt % silver film, the specular reflectivity diminished sharply with further heating at a constant temperature of 300°C. Incorporating the AgHFA complex into the soluble, fully imidized form of poly{(1,3‐dihydro‐1,3‐dioxo‐2H‐isoindole‐2,5‐diyl)[2,2,2‐trifluoro‐1‐(trifluoromethyl)ethylidene](1,3‐dihydro‐1,3‐dioxo‐2H‐isoindole‐5,2‐diyl)‐1,4‐phenyleneoxy‐1,4‐phenylene[2,2,2‐trifluoro‐1‐(trifluoromethyl)ethylidene]‐1,4‐phenyleneoxy‐1,4‐phenylene} gave films that were 25% less reflective than those beginning with poly(amic acid). Though highly reflective, the films were not electrically conductive. The metalized membranes were thermally stable and maintained mechanical properties similar to those of the parent polyimide. Transmission electron microscopy revealed an air‐side, near‐surface layer of silver that was about 40 nm thick; the interior of the film had well‐dispersed metal particles with diameters mostly less than 2 nm. The near‐surface silver layer maintained its integrity because of physical entrapment of the metal nanoparticles beneath a thin layer of polyimide; that is, the practical adhesion of the metal layer was good. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2409–2418, 2007

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Section: Resultsmentioning

confidence: 99%

Treatment recommendations for primary extradural meningiomas

Mattox

Hughes

Oleson

et al. 2010

Cancer

View full text Add to dashboard Cite

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“…27 Optical transparency increases with decreased molecular interactions and with shorter intermolecular π-conjugation. 2 All the prepared PI films were transparent and colorless compared with the traditional aromatic kapton-IF70 film. This film was derived from 1,2,4,5-benzenetetracarboxylic anhydride and octadecylamine, which showed deep yellow to brown color due to the formation of charge transfer (CT) complex in the molecule.…”

Section: Thermal Behaviors Of Pi Filmsmentioning

confidence: 97%

“…High water absorption is one of problems with insulation materials, because it causes corrosion of metal wiring and instability of electrical properties such as dielectric constant. 2 Other films had lower water absorptivities due to the introduction of siloxane, compared with kapton-IF70 film. Conventional polyimides have relatively high water absorptivities due to their chemical and phase structures, especially in-plane orientations and molecular chain lengths.…”

Section: Thermal Behaviors Of Pi Filmsmentioning

confidence: 98%

“…1,2 Owing to its good thermal stability, mechanical properties, and dielectric characteristics, PI has been widely used in aerospace and microelectronics industries, as insulating coatings for aircraft wires, thin films and coatings for microelectronic, etc. 1,2 Owing to its good thermal stability, mechanical properties, and dielectric characteristics, PI has been widely used in aerospace and microelectronics industries, as insulating coatings for aircraft wires, thin films and coatings for microelectronic, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Polyimide (PI) has been widely researched ever since it was synthesized and commercialized by DuPont in the 1960s. 1,2 Owing to its good thermal stability, mechanical properties, and dielectric characteristics, PI has been widely used in aerospace and microelectronics industries, as insulating coatings for aircraft wires, thin films and coatings for microelectronic, etc. [3][4][5][6] It is well-known that, the outstanding properties of PI are closely associated with its chemical structure, molecular composition and intermolecular interactions, and generally the structure is modified to improve its properties.…”

Section: Introductionmentioning

confidence: 99%

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Factors influencing thermal, mechanical, optical, and adhesive properties of segmented poly(imide siloxane) copolymers films

Zhao

Chen

et al. 2019

J of Applied Polymer Sci

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Poly(imide siloxane), block and blend copolymer, were synthesized using different methods to explore the influence of siloxane chains. The flexible siloxane chains enrichment on surface of copolymer, enhance hydrophobic and adhesive with copper foil. It also improves light transmittance of polyimide film in the visible light region. The effect of different preparation methods on the aggregation in polymers and on polymer properties, especially adhesion and water absorptivity, are also discussed. The imidization temperature and synthesis method (blend and block) during the reaction has a significant effect on the properties of the product, especially thermal properties (T g values are 207 C for block and 180 C for blend) and mechanical properties (elongation of 130% for block and 50% for blend). The bonding strength of polymer films used as hot melt adhesive was also tested.

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