Synthesis of Poly(4,5-bis-hydroxy-1,3-cyclopentadienylene vinylene) from Poly(6,8-(1,5-dichloro-2,4-dioxa-3-keto)-bicyclo[3.3.0]octylene vinylene). Generation of a Conjugated Polymer by Hydrolysis of a Precursor Polymer

1986 ◽  
Vol 18 (3) ◽  
pp. 161-165 ◽  
Author(s):  
W. James Feast ◽  
Kevin Harper
Keyword(s):  
Conjugated Polymer ◽  
Precursor Polymer ◽  
Hydrolysis Of

Fabrication of Polymer Light Emitting Diodes by Layer-by-Layer Complexation Technique

1997 ◽  
Vol 488 ◽  
Author(s):  
Jaehyun Kim ◽  
Kethinni G. Chittibabu ◽  
Mario J. Cazeca ◽  
Woohong Kim ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Multilayer Film ◽  
Multilayer Films ◽  
Spectroscopic Techniques ◽  
Layer By Layer ◽  
Light Emitting ◽  
Electroluminescence Brightness ◽  
Polymer Light Emitting Diodes ◽  
Uv Visible ◽  
Hydrolysis Of

AbstractMultilayer films were fabricated employing a new layer-by-layer complexation technique by alternatively dipping substrates in solutions of macromolecular ligands and Eu3+ ions. A luminescent poly[2-(3-thienyl)ethanol hydroxycarbonyl-methyl urethane] (H-PURET) was prepared by hydrolysis of thiophene polymer, poly[2-(3-thienyl)ethanol butoxycarbonyl-methyl urethane] (PURET), which was developed in our laboratory. H-PURET was used as macromolecular ligands. The multilayer deposition was monitored using UV-visible spectroscopy. As the number of bilayers increases, the absorption due to the polymer increases. The multilayer films were characterized by infrared and fluorescence spectroscopic techniques. Electroluminescence brightness easily obtained from the multilayer film of conjugated polymer-Eu3+ complex was measured to be about 40nW.

Thermal Conversion of Precursor Polymer to Low Bandgap Conjugated Polymer Containing Isothianaphthene Dimer Subunits

2011 ◽  
Vol 116 (1) ◽  
pp. 1256-1264 ◽  
Author(s):  
Tomokazu Umeyama ◽  
Kohei Hirose ◽  
Kei Noda ◽  
Kazumi Matsushige ◽  
Tetsuya Shishido ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Thermal Conversion ◽  
Low Bandgap ◽  
Precursor Polymer

Molecular Assemblies, Patterning, and Deposition of Conjugated Polymers: Ultrathin Films Prepared using the Layer-by-Layer and Precursor Polymer Electrodeposition Approach

2001 ◽  
Vol 665 ◽  
Author(s):  
Rigoberto Advincula ◽  
Mi-kyoung Park ◽  
Chuanjun Xia
Keyword(s):  
Ultrathin Films ◽  
Conjugated Polymer ◽  
Film Formation ◽  
Molecular Assembly ◽  
Ultrathin Film ◽  
Polymer Materials ◽  
Layer By Layer ◽  
Precursor Polymer ◽  
Wet Processing ◽  
Novel Method

ABSTRACTIn this paper we present a combined protocol for ultrathin film formation and assembly of Φ- conjugated polymer materials using the layer-by-layer (LbL) technique and a precursor polymer approach to electrodeposition. While much work has been done on investigating the chemistry (synthesis) and properties (physics) of these materials, little focus has been given on the multilayer and ordering issues associated with ultrathin film formation especially using novel “wet-processing” approaches. This work details our molecular assembly approaches on conjugated polymer systems for polyfluorene and polythiophene derivatives. This was demonstrated in the following systems: a) ionene precursor polyfluorene polymers deposited as ultrathin films using the LbL technique from an aqueous solution and b) electrodeposition of polysiloxane modified precursor polymers. Important strategies are outlined for combining the two techniques as a novel method for preparing ultrathin films and patterning.

scholarly journals Preparation of pH-Responsive Poly(aspartic acid) Nanogels in Inverse Emulsion

2016 ◽  
Vol 61 (1) ◽  
pp. 19 ◽  
Author(s):  
Enikő Krisch ◽  
Benjámin Gyarmati ◽  
András Szilágyi
Keyword(s):  
Aspartic Acid ◽  
Gelation Time ◽  
Compression Tests ◽  
Inverse Emulsion ◽  
Precursor Polymer ◽  
Negative Surface ◽  
Negative Surface Charge ◽  
Mild Hydrolysis ◽  
Hydrolysis Of

Poly(aspartic acid) (PASP) hydrogels were prepared by cross-linking polysuccinimide (PSI) with diaminobutane followed by the mild hydrolysis of the resultant PSI gels to PASP hydrogels. The composition dependence of the gelation time and the stiffness of bulk PASP hydrogels were determined by rheometry and compression tests, respectively. The composition of the prepared PASP nanogels was chosen based on the results on bulk PASP hydrogels. Prior to nanogel preparation stability of DMSO-in-oil (inverse) emulsions was tested as a function of the chemical quality of apolar phase, the concentration of the precursor polymer and the concentration of the surfactant. PASP nanogels in the size of a few hundred nanometers were prepared by the hydrolysis of PSI nanogels synthesized in inverse emulsion. PASP nanogels showed pH-dependent swelling and strongly negative surface charge at physiological pH values, thus they can be further developed to meet the specific criteria of different bio-related applications.

A label-free conjugated polymer-based fluorescence assay for the determination of adenosine triphosphate and alkaline phosphatase

2014 ◽  
Vol 38 (9) ◽  
pp. 4574-4579 ◽  
Author(s):  
Yanan Li ◽  
Yan Li ◽  
Xinyan Wang ◽  
Xingguang Su
Keyword(s):  
Alkaline Phosphatase ◽  
Adenosine Triphosphate ◽  
Conjugated Polymer ◽  
Fluorescence Assay ◽  
Label Free ◽  
Quenching Effect ◽  
Hydrolysis Of

A sensor was developed based on the quenching effect of Cu2+ on PPESO3 and the hydrolysis of ATP by ALP.

Fine Structural Localization of Acyltransferases Involved in Lipid Synthesis in Intestinal Mucosa.

1970 ◽  
Vol 28 ◽  
pp. 54-55
Author(s):  
R. J. Barrnett ◽  
J. A. Higgins
Keyword(s):  
Smooth Endoplasmic Reticulum ◽  
Lipid Synthesis ◽  
Mucosal Cell ◽  
Structural Localization ◽  
Morphological Studies ◽  
Mucosal Cells ◽  
Initial Appearance ◽  
Sh Group ◽  
Hydrolysis Of ◽  
Intestinal Mucosal Cells

The main products of intestinal hydrolysis of dietary triglycerides are free fatty acids and monoglycerides. These form micelles from which the lipids are absorbed across the mucosal cell brush border. Biochemical studies have indicated that intestinal mucosal cells possess a triglyceride synthesising system, which uses monoglyceride directly as an acylacceptor as well as the system found in other tissues in which alphaglycerophosphate is the acylacceptor. The former pathway is used preferentially for the resynthesis of triglyceride from absorbed lipid, while the latter is used mainly for phospholipid synthesis. Both lipids are incorporated into chylomicrons. Morphological studies have shown that during fat absorption there is an initial appearance of fat droplets within the cisternae of the smooth endoplasmic reticulum and that these subsequently accumulate in the golgi elements from which they are released at the lateral borders of the cell as chylomicrons.We have recently developed several methods for the fine structural localization of acyltransferases dependent on the precipitation, in an electron dense form, of CoA released during the transfer of the acyl group to an acceptor, and have now applied these methods to a study of the fine structural localization of the enzymes involved in chylomicron lipid biosynthesis. These methods are based on the reduction of ferricyanide ions by the free SH group of CoA.

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