New diphenylamine-based donor–acceptor-type conjugated polymers as potential photonic materials
摘要:
A new series of donor-acceptor-type conjugated polymers (P1 and P2) carrying a diphenyl amine moiety were synthesized via Wittig condensation technique. The polymers structures were well established by FT-IR, H-1 NMR, elemental analysis and gel permeation chromatographic techniques. They exhibited good thermal stability with an onset decomposition temperature of approximately 325 degrees C under nitrogen atmosphere. The optical and electrochemical properties of the polymers were studied by UV-vis, fluorescence emission spectroscopy and cyclic voltammetry. They exhibited good fluorescence in dilute solutions and showed solvatochromic behavior in various polar solvents. The electrochemical studies revealed that the polymers possess low-lying LUMO energy levels that ranging from -3.47 to -3.73 eV and high-lying HOMO energy levels that ranging from -5.57 to -5.81 eV. The thirdorder nonlinear optical properties of the polymers were investigated using the Z-scan technique. The effective two-photon absorption (TPA) coefficients (beta) of the polymers were found to be 0.645 x 10(-10) and 0.212 x 10(-10) m/W. (C) 2011 Elsevier Ltd. All rights reserved.
New diphenylamine-based donor–acceptor-type conjugated polymers as potential photonic materials
摘要:
A new series of donor-acceptor-type conjugated polymers (P1 and P2) carrying a diphenyl amine moiety were synthesized via Wittig condensation technique. The polymers structures were well established by FT-IR, H-1 NMR, elemental analysis and gel permeation chromatographic techniques. They exhibited good thermal stability with an onset decomposition temperature of approximately 325 degrees C under nitrogen atmosphere. The optical and electrochemical properties of the polymers were studied by UV-vis, fluorescence emission spectroscopy and cyclic voltammetry. They exhibited good fluorescence in dilute solutions and showed solvatochromic behavior in various polar solvents. The electrochemical studies revealed that the polymers possess low-lying LUMO energy levels that ranging from -3.47 to -3.73 eV and high-lying HOMO energy levels that ranging from -5.57 to -5.81 eV. The thirdorder nonlinear optical properties of the polymers were investigated using the Z-scan technique. The effective two-photon absorption (TPA) coefficients (beta) of the polymers were found to be 0.645 x 10(-10) and 0.212 x 10(-10) m/W. (C) 2011 Elsevier Ltd. All rights reserved.
LUBRICANT COMPOSITIONS CONTAINING A HETEROAROMATIC COMPOUND
申请人:MATHUR Naresh
公开号:US20120291737A1
公开(公告)日:2012-11-22
An ashless additive for lubricating oil compositions, lubricating oil compositions and methods for lubricating that are effective to improve the total base number (TBN) of a lubricant composition. The additive is a reaction product of a compound of the formula:
with NH
3
, an alcohol, an amine, or a hydrocarbyl amine, wherein R
1
is selected from H, a hydrocarbyl group, the alcohol or amine contains from 1 to about 24 carbon atoms, and the hydrocarbyl amine has a number average molecular weight ranging from about 100 to about 6000
Additives and lubricant formulations for improved antioxidant properties
申请人:Esche K. Carl
公开号:US20060205615A1
公开(公告)日:2006-09-14
A method and compositions for lubricating surfaces with lubricating oils exhibiting increased antioxidant properties. The lubricated surface includes a lubricant composition containing a base oil of lubricating viscosity and an amount of at least one hydrocarbon soluble metal compound effective to provide a reduction in oxidation of the lubricant composition greater than a reduction in oxidation of the lubricant composition devoid of the hydrocarbon soluble metal compound. The metal of the metal compound is selected from the group consisting of titanium, zirconium, and manganese.
Benzotriazole stabilizers for polyols and polyurethane foam
申请人:R.T. VANDERBILT COMPANY, Inc.
公开号:EP0839861A2
公开(公告)日:1998-05-06
Polyether and polyester poloyols and polyurethane foams are stabilized by including therein stabilizers selected from (1) diphenylaminomethylbenzotriazole substituted by alkyl or phenylalkyl groups or (2) synergistic compositions consisting of (a) benzotriazole or alkylbenzotriazole and (b) secondary aromatic amine substituted by alkyl or phenylalkyl groups wherein the benzotriazole and amine is present in critical ratios.
Furthermore, a method is disclosed for preparation of polyurethane foams from polyols and polyisocyanate that have reduced discoloration due to scorch by adding diphenylamino methylbenzotriazole or compositions of benzotriazole and secondary aromatic amine as scorch inhibitors to the polyol, foaming the polyol and curing.
An antioxidant additives combination for lubricants containing a molybdenum complex and an alkylated phenothiazine
申请人:ETHYL CORPORATION
公开号:EP1369469A1
公开(公告)日:2003-12-10
A lubricating oil composition having improved antioxidant properties, contains a molybdenum compound and an alkylated phenothiazine and may also include a secondary diarylamine.
There is provided a lubricating composition having a major amount of a lubricating oil having less than about 40% by weight alkylcycloparaffins and a minor amount of at least one diarylamine, and processes for making and using thereof.