Aromatic hydrocarbon

About: Aromatic hydrocarbon is a research topic. Over the lifetime, 5814 publications have been published within this topic receiving 55499 citations. The topic is also known as: arene & arenes.

Diamine compound, and organic electroluminescent device containing the same

Abstract: PROBLEM TO BE SOLVED: To provide a diamine compound suitably usable as a light-emitting material for organic electroluminescent devices. SOLUTION: The new diamine compound represented by the general formula(1) and/or (1') is provided. The organic electroluminescent device low in driving voltage, long in light emission life and high in durability is such that at least one layer containing at least one kind of the diamine compound is sandwiched between a pair of electrodes. In the above formula(1) and/or (1'), Ar 1 , Ar 2 , Ar 4 , Ar 5 and Ar 6 are each a (substituted) aromatic hydrocarbon group or (substituted) aromatic heterocyclic group, wherein Ar 1 and Ar 2 and/or Ar 5 and Ar 6 may be bound to each other to form a nitrogen-containing heterocyclic ring each; R is H, cyano, a halogen atom, (substituted) straight-chain, branched or cyclic alkyl, (substituted) aromatic hydrocarbon group or (substituted) aromatic heterocyclic group; and X and Ar 3 are each a bivalent aromatic hydrocarbon group or bivalent aromatic heterocyclic group. COPYRIGHT: (C)2004,JPO&NCIPI

Heat-resistant positive photoresist composition

Abstract: PURPOSE:To obtain a heat-resistant positive type photoresist composition, composed of a heat-resistant polyimide-based polymer containing eliminative protecting group and a compound capable of inducing eliminating reaction of the protecting groups and capable of regulating physical properties of the resultant films within a wide range. CONSTITUTION:A positive type photoresist composition is obtained by blending (A) a polymer, prepared by protecting OH groups and, as necessary, COOH groups in an imide-based polymer obtained from a tetracarboxylic acid dianhydride, an OH group-containing aromatic diamine and, as necessary, an aromatic or an aliphatic diamine without OH group with eliminative protecting groups (preferably tetrahydropyranyl group or t-butyl group) under acidic or alkaline conditions and consisting essentially of structural units expressed by the formula [R is tetravalent aromatic hydrocarbon group or aliphatic hydrocarbon group; R is (2+n)-valent aromatic hydrocarbon group having one or more OH groups protected with the aforementioned protecting groups; (n) is 0-5] with (B) 5-50wt.% compound (e.g. a diallylsulfonium salt) capable of inducing the eliminating reaction of the aforementioned protecting groups by irradiation with active rays.

Cave Drip Water-Related Samples as a Natural Environment for Aromatic Hydrocarbon-Degrading Bacteria.

Abstract: Restricted contact with the external environment has allowed the development of microbial communities adapted to the oligotrophy of caves. However, nutrients can be transported to caves by drip water and affect the microbial communities inside the cave. To evaluate the influence of aromatic compounds carried by drip water on the microbial community, two limestone caves were selected in Brazil. Drip-water-saturated and unsaturated sediment, and dripping water itself, were collected from each cave and bacterial 16S rDNA amplicon sequencing and denaturing gradient gel electrophoresis (DGGE) of naphthalene dioxygenase (ndo) genes were performed. Energy-dispersive X-ray spectroscopy (EDX) and atomic absorption spectroscopy (AAS) were performed to evaluate inorganic nutrients, and GC was performed to estimate aromatic compounds in the samples. The high frequency of Sphingomonadaceae in drip water samples indicates the presence of aromatic hydrocarbon-degrading bacteria. This finding was consistent with the detection of naphthalene and acenaphthene and the presence of ndo genes in drip-water-related samples. The aromatic compounds, aromatic hydrocarbon-degrading bacteria and 16S rDNA sequencing indicate that aromatic compounds may be one of the sources of energy and carbon to the system and the drip-water-associated bacterial community contains several potentially aromatic hydrocarbon-degrading bacteria. To the best of our knowledge, this is the first work to present compelling evidence for the presence of aromatic hydrocarbon-degrading bacteria in cave drip water.

Polymeric antioxidants for elastomers and rubbers

Abstract: 1,161,909. Aromatic polyamines; antioxidants for silicone rubbers. MINISTER OF TECHNOLOGY. 12 Sept., 1967 [12 Sept., 1966], No. 40674/66. Headings C3R and C3T. The invention comprises polymers with repeating units of formula where Ar and Ar 1 , which may be the same or different, are divalent aromatic hydrocarbon groups at least Ar 1 being derived from a fused ring hydrocarbon. Preferably Ar is a phenylene group. The polymers are prepared by condensing dihydroxy aromatic compounds with diamino aromatic compounds. The polymers are used as antioxidants in silicone rubber. In an example, hydroquinone is condensed with 3,8- diaminopyrene and the polymer incorporated in a methyl vinyl silicone containing silica and an organic peroxide catalyst. Condensation of hydroquinone with diamino anthraquinone also is mentioned.