نتایج جستجو برای: aromatic polymer

تعداد نتایج: 134468  

Journal: :The journal of physical chemistry. B 2011
Hsuan-Chih Chu Yu-Hsien Lee Shou-Jen Hsu Po-Jen Yang Atsushi Yabushita Hong-Cheu Lin

A novel light-emitting monomer M1 and its side-chain polymer P1 containing three conjugated aromatic pendants, including one pyridyl terminus, were successfully synthesized via Wittig and Pd-catalyzed Heck coupling reactions. The fluorescence of polymer P1 was efficiently quenched upon addition of different metal ions due to the facile energy transfers from the pendent groups of polymer P1 to s...

2016
Amit Kumar Seiji Tateyama Katsuaki Yasaki Mohammad Asif Ali Naoki Takaya Rajeev Singh Tatsuo Kaneko

Structural investigation of polymers by various available analytical methods is important in order to correlate the structure with polymer properties for which understanding of polymer structure is very important factor. The data presented here in this article shows the (1)H NMR spectra used for the characterization of prepared poly(amic acid)s (PAAs). It is often difficult to assigns the peak ...

Journal: :Polymer Testing 2021

Liquid polymers are used in elastomeric compounds to modify their processing and final characteristics. The material is considered as a polymeric plasticizer substitute or supplement conventional like paraffinic aromatic oils, hydrocarbon resins. Their plasticizing effect contribution the crosslinking sulfur cured SSBR mixtures studied. Aromatic oil, aliphatic resin different liquid polymers, v...

2011
M. RASHID

The cyclic potential sweep (CPS) was applied to aniline and substituted aniline to study the kinetic aspects and mechanism of polymerization of anilines, the dependence of the deposition rate of aromatic amines (i.e., deposition charge on number of cycles, scan rate and concentration of monomer). In this method, the mass of polymer deposited at electrode is a function of anodic peak current tha...

Journal: :Biomaterials 2000
L Erdmann K E Uhrich

A biodegradable poly(anhydride-ester) was synthesized by melt condensation polymerization of the acetylated monomer to yield a novel polymeric prodrug. The polymer we have synthesized is composed of alkyl chains linked by ester bonds to aromatic moieties, specifically salicylic acid--the active component of aspirin. With the medicinal properties attributed to salicylic acid and the ease of meta...

2003
M. G. Zolotukhin D. R. Rueda F. J. Balta

High molecular weight aromatic poly(ether ketone ketone)s were synthesized by the Friedel-Crafts polyacylation condensation of isoand terephthaloyl chlorides with diphenyl ether, 1,4and 1,3-bis(4phenoxybenzoyl)benzenes. Depending on the monomers used for polycondensation, polyketones of regular structure with different iso-/tereisomer repeating unit ratio (100/0, 50/50, 0/100) in the main chain...

Journal: :ACS applied materials & interfaces 2014
Hyung-Jun Koo Kristopher V Waynant Chunjie Zhang Paul V Braun

We present a facile microfluidic method for forming narrow chemical gradients in polymer brushes. Co-flow of an alkylating agent solution and a neat solvent in a microfluidic channel forms a diffusion-driven concentration gradient, and thus a gradient in reaction rate at the interface of the two flows, leading to a quaternization gradient in the underlying poly(2-(dimethylamino)ethyl methacryla...

Journal: :Environmental science & technology 2003
Hui Li Linda S Lee Darrell G Schulze Christopher A Guest

Soil-induced oxidation and subsequent polymerization of aromatic amines is an important pathway for reducing the mobility of amines in soils and their hazard potential in the environment. This study assesses the hypothesis that manganese(III/IV) oxides/hydroxides play a significant role in the oxidation of aromatic amines in whole soils. Aromatic amines including alpha-naphthylamine, p-methoxya...

Journal: :The journal of physical chemistry. B 2009
Licínia L G Justino M Luísa Ramos Paulo E Abreu Rui A Carvalho Abilio J F N Sobral Ullrich Scherf Hugh D Burrows

Relationships have been obtained between intermonomer torsional angle and NMR chemical shifts ((1)H and (13)C) for isolated chains of two of the most important poly(9,9-dialkylfluorenes), poly[9,9-bis(2-ethylhexyl)fluorene-2,7-diyl] (PF2/6) and the copolymer poly(9,9-dioctylfluorene-co-[2,1,3]benzothiadiazole-4,7-diyl) (F8BT), using DFT calculations. The correlations provide a model for NMR spe...

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