Heat‐Resistant Polymers

Cassidy, Patrick E.; Aminabhavi, Tejraj M.; Reddy, V. Sreenivasulu

doi:10.1002/0471238961.0805012003011919.a01

Cited by 13 publications

(12 citation statements)

References 90 publications

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“…Wholly aromatic polyimides are noted for their high‐temperature resistance and physicomechanical properties which make them desirable for a variety of high‐performance applications in the fields of aerospace, automobiles, microelectronics, optoelectronics and others 1–5. However, most polyimides are often insoluble, do not show a glass transition and are intractable in their fully imidized form, thus showing severe difficulties in processing.…”

Section: Introductionmentioning

confidence: 99%

Heterocyclic polyimides containing siloxane groups in the main chain

Damaceanu¹,

Bacosca²,

Brumă³

et al. 2009

Polymer International

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BACKGROUND: Among the polymers widely studied for applications in advanced techniques, aromatic polyimides have received considerable attention due to their outstanding thermal stability associated with good electrical and mechanical properties. However, these polymers are usually difficult to process, being insoluble and without a glass transition. To improve the processing characteristics of polyimides, modification of their structure is often achieved by the introduction of flexible linkages in the macromolecular chain or various substituents on the aromatic rings. RESULTS: A series of polyimides and intermediate polyamidic acids were synthesized from aromatic oxadiazole‐diamines and a dianhydride containing a siloxane bridge (R2SiOSiR2). These polymers exhibit good solubility in certain organic solvents and can be cast into thin and very thin films from their solutions. They exhibit high thermal stability with decomposition being above 440 °C and relatively low glass transition temperatures in the range 160–190 °C. These polymers show strong photoluminescence in the blue spectral region. CONCLUSION: The introduction of oxadiazole rings together with siloxane groups into the chains of aromatic polyimides gives highly thermostable polymers with remarkable solubility and film‐forming ability and that emit blue light, being attractive for applications in micro‐ and nanoelectronics and other related advanced fields. Copyright © 2009 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Heterocyclic polyimides containing siloxane groups in the main chain

Damaceanu¹,

Bacosca²,

Brumă³

et al. 2009

Polymer International

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“…Fully aromatic poly(1,3,4-oxadiazole)s form a class of high-performance polymers that are designated for use in small quantities, but with very high end-value [1,2]. The areas of high performance include electronic properties, electric conduction, optical properties, good hydrolytic stability, highly ordered systems, mechanical resistance and high thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Poly(1,3,4-oxadiazole-amide-ester)s and Thin Films Made from Them

Sava¹,

Brumă²,

Szesztay³

et al. 2005

High Performance Polymers

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Aromatic poly(1,3,4-oxadiazole-amide-ester)s were prepared by polycondensation reaction of diacid chlorides containing preformed ester groups with aromatic diamines containing 1,3,4-oxadiazole units. These polymers were easily soluble in N-methylpyrrolidinone and were cast into flexible films from such solutions. The polymers showed high thermal stability with initial decomposition temperature being above 365 1 C and glass transition temperature in the range of 215-260 1 C. The weight average molecular weight was in the range of 91 000-257 000 and polydispersity is in the range of 1.64-5. The polymer films showed good mechanical properties with tensile strength in the range of 40-91 MPa, elastic modulus in the range of 2.22-3.98 GPa and elongation at break in the range of 1.85-7.37%.

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“…It is known that aromatic poly(1,3,4‐oxadiazole)s exhibit high thermal resistance in an oxidative atmosphere, good hydrolytic stability, low dielectric constant, and tough mechanical properties 1, 2. More recently, specific properties determined by the electronic structure of oxadiazole ring, especially its electron‐withdrawing character, reinvigorated intensive research aimed at using such polymers as advanced materials in microelectronics, optoelectronics, and other industries.…”

Section: Introductionmentioning

confidence: 99%

Ultrafractionation in human malignant glioma xenografts

Krause

Joiner

Baumann

2003

Intl Journal of Cancer

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A series of six new aromatic polyamides with side oxadiazole rings has been synthesized by polycondensation reaction of aromatic diamines containing pendent substituted oxadiazole groups with a silicon‐containing diacid chloride [namely, bis(p‐chlorocarbonyl‐phenylene)diphenylsilane] or with a fluorine‐containing diacid chloride [namely, hexafluoroisopropylidene‐bis(p‐benzoyl chloride)]. All polymers were easily soluble in amidic solvents, such as N‐methylpyrrolidinone and dimethylformamide, and gave thin transparent films by casting such solutions. Very thin coatings were deposited onto silicon wafers and exhibited smooth, pinhole‐free surfaces in atomic force microscopy investigations. The polymers showed high thermal stability, with decomposition temperature >400°C. Some of them did exhibit a glass transition, in the range 152–276°C, with a reasonable interval between glass transition and decomposition. Four of these polymers showed blue photoluminescence, in the range 460–480 nm, which makes them promising candidates for future use as high‐performance materials in the construction of light‐emitting devices. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 714–721, 2003

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Heat‐Resistant Polymers

Cited by 13 publications

References 90 publications

Heterocyclic polyimides containing siloxane groups in the main chain

Heterocyclic polyimides containing siloxane groups in the main chain

Poly(1,3,4-oxadiazole-amide-ester)s and Thin Films Made from Them

Ultrafractionation in human malignant glioma xenografts

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