nmr study of polyacrylamide tacticity synthesized belgique

nmr study of polyacrylamide tacticity synthesized by

NMR Study of Polyacrylamide Tacticity Synthesized by

Request PDF | NMR Study of Polyacrylamide Tacticity Synthesized by Precipitated Polymerization Method | I n this study polyacrylamide was prepared in various molar ratio contents of ethyl acetate

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sid.ir | nmr study of polyacrylamide tacticity synthesized by

SID.ir | NMR STUDY OF POLYACRYLAMIDE TACTICITY SYNTHESIZED BY

In this study polyacrylamide was prepared in various molar ratio contents of ethyl acetate and ethanol at 60 ° C by free-radical precipitated polymerization method. The assignment of all stereosequences at pentad level of methine, hexad level of methylene, and triad level of carbonyl carbons of the polyacrylamide were observed using 13 C nuclear magnetic resonance spectroscopy (13 C NMR) in

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ﺪﯿﻔﻣ ىﺎﻫ ﮏﻨﯿﻟ - sid.ir

ﺪﯿﻔﻣ ىﺎﻫ ﮏﻨﯿﻟ - SID.ir

polyacrylamide; precipitated polymerization; tacticity; NMR; microstructure. (*) To whom correspondence to be addressed. E-mail: [email protected] ABSTRACT Key Words: NMR Study of Polyacrylamide Tacticity Synthesized by Precipitated Polymerization Method Farshid Ziaee1*, Hosein Bouhendi1, and Farhood Ziaie2

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carbon-13 nmr analysis of the tacticity of polyacrylamide

Carbon-13 NMR Analysis of the Tacticity of Polyacrylamide

<ArticleTitle Language="En" xml:lang="en">Carbon-13 NMR Analysis of the Tacticity of Polyacrylamide</ArticleTitle> Skip to main content Thank you for visiting nature.com.

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tacticity, molecular weight, and temporal control by

Tacticity, molecular weight, and temporal control by

Dual control over molecular weight and tacticity in the polymerization of N,N-dimethylacyrlamide, N,N-diethylacrylamide, N-isopropylacrylamide, and acrylamide was achieved by organotellurium-mediated radical polymerization (TERP) in the presence of Y(OTf)3 or Yb(OTf)3 as a Lewis acid catalyst.

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investigation of poly(α-methyl styrene) tacticity synthesized

Investigation of poly(α-methyl styrene) tacticity synthesized

In this work, poly(α-methyl styrene) (PAS) was synthesized by free radical photo-polymerization. The tacticity and microstructure of PAS were studied by 13C nuclear magnetic resonance spectroscopy (13C NMR). Assignments of all stereo sequences were carried out at pentad and hexad levels of quaternary aliphatic, quaternary aromatic, and methylene carbons using 13C NMR in deuterated chloroform

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effect of temperature on tacticity in thermal polymerization

Effect of temperature on tacticity in thermal polymerization

Ziaee F, Bouhendi H, Ziaie F (2009) NMR study of polyacrylamide tacticity synthesized by precipitated polymerization method. Iran Polym J 18:947–956. CAS Google Scholar 18. Feil F, Harder S (2003) New stereochemical assignments of 13 C NMR signals for predominantly syndiotactic polystyrene. Macromolecules 36:3446–3448

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farshid ziaee | iran polymer and petrochemical institute

Farshid ZIAEE | Iran Polymer and Petrochemical Institute

The tacticity and microstructure of PAS were studied by 13C nuclear magnetic resonance spectroscopy (13C NMR). NMR Study of Polyacrylamide Tacticity Synthesized by Precipitated Polymerization

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‪farhood ziaie‬ - ‪google scholar‬

‪Farhood Ziaie‬ - ‪Google Scholar‬

NMR study of polyacrylamide tacticity synthesized by precipitated polymerization method F Ziaee, H Bouhendi, F Ziaie IRANIAN POLYMER JOURNAL (ENGLISH) 18 (12114), 947-956 , 2009

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the study of microstructures of poly(v1nyl alcohol) by nmr

THE STUDY OF MICROSTRUCTURES OF POLY(V1NYL ALCOHOL) BY NMR

tacticity and detection of irregular structures such as end groups, short branches, polyene structure and reversed monomer sequences. NMR is the most powerful method available for characterizing microstructures of polymer. In this paper, the results of 1H and 1%- NMR study on the microstructures of

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300 mhz 1h‐nmr study of poly(propylene sulfide), journal of

300 MHz 1H‐NMR study of poly(propylene sulfide), Journal of

MAURICE SEPULCHRE and NICOLAS SPASSKY, Laboratoire de Chimie M a c r m o l k u l a i ~ eassocii au C N R S , Universiti de Paris V I ,Paris 5e, , France, and DANIEL VAN OOTEGHEM and ERIC J. GOETHALS, Institute o f Organic Chemistry, Rijksuniversiteit Gent, Gent, Belgium. Synopsis An lH 300-MHz NMR spectroscopic study of deuterated poly

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characterization of the molecular structure of two highly

Characterization of the molecular structure of two highly

tacticity of polypropylene [8–10,15,16]. In this context, TREF has gained increasing popularity over the past few years. In the literature, TREF has been mainly used as a powerful tool to probe a qualitative tacticity distribution along with a modification of the nature of the catalysis [1,9,10,16]. In the present study, we used preparative

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inorganic-organic composite solid electrolyte based on cement

Inorganic-organic composite solid electrolyte based on cement

By this method, polymer content can be increased remarkably to 40 wt.%. Infrared and 1 H-NMR spectra confirm that Polyacrylamide (PAM) is successfully synthesized in CSE. The GPC results show that the molecular mass of the synthesized PAM in CSE increases with monomer content.

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application of polymer integration technique for enhancing

Application of polymer integration technique for enhancing

NMR measurement of integrated polymer solutions at time zero. The 1 H NMR analysis of integrated polymer using Bruker topspin 3.5 software shows a prominent peak positioned at 4.8 ppm, which represents the water content in the deuterium oxide solvent. Accordingly, the amounts of proton atoms (H) within the peak area were further calibrated.

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acrylamide modified poly(vinyl alcohol): crystalline and

Acrylamide modified poly(vinyl alcohol): crystalline and

The change in tacticity of PVA due to AAm modification is of special interest by the reason that PVA with higher tacticity, which has higher ability to form intermolecular hydrogen bond and crystals, leads to poor water solubility and eventually insolubility of PVA in hot water. 27,28 Though introducing AAm units into PVA chain to decrease the

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us20130030144a1 - star polymers having controlled tacticity

US20130030144A1 - Star polymers having controlled tacticity

Disclosed is a method for synthesizing star polymers having controlled tacticity. The method comprises reacting a lactone-based monomer having at least one stereocentre and a poly-functional initiator in the presence of at least one catalyst.

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synthetic assembly of mannose moieties using polymer

Synthetic Assembly of Mannose Moieties Using Polymer

In an explorative study, the binding of a synthesized glycopolymer to biosensor-immobilized Con A was examined, and this allowed us to determine both the kinetics parameters and affinity constant K a of the interaction, which may further aid in understanding the biological specificity and functions of both the glycoconjugate and the lectin. We

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acrylamide modified poly(vinyl alcohol): crystalline and

Acrylamide modified poly(vinyl alcohol): crystalline and

The change in tacticity of PVA due to AAm modification is of special interest by the reason that PVA with higher tacticity, which has higher ability to form intermolecular hydrogen bond and crystals, leads to poor water solubility and eventually insolubility of PVA in hot water. 27,28 Though introducing AAm units into PVA chain to decrease the

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us20130030144a1 - star polymers having controlled tacticity

US20130030144A1 - Star polymers having controlled tacticity

Disclosed is a method for synthesizing star polymers having controlled tacticity. The method comprises reacting a lactone-based monomer having at least one stereocentre and a poly-functional initiator in the presence of at least one catalyst.

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hydrogels based on poly(ether-ester)s as highly controlled 5

Hydrogels Based on Poly(Ether-Ester)s as Highly Controlled 5

mers were characterized by nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) techniques; the structure and tacticity of the macromolecules were determined. The rela-tionship between the copolymer structure and the reaction conditions was evaluated. The optimal conditions were specified as 140 C and 24 h. In the next step

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stereospecific living radical polymerization for simultaneous

Stereospecific living radical polymerization for simultaneous

This study allowed us to synthesize poly(NVP) by varying the molecular weights and the tacticity, and revealed that the T g of poly(NVP) increased with the increasing molecular weights or the decreasing syndiotacticity at least between r = 53 and 63% and can be varied between 165 and 180 °C.

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structure elucidation of clindamycin phosphate by nmr

Structure Elucidation of Clindamycin Phosphate by NMR

A Solid-State ^1^3C NMR and Laser Raman Spectroscopy Study on Synthesized Methane Hydrates Fu, Juan / Wu, Neng-you / Wu, Dai-dai / Su, Qiu-cheng | 2017 print version

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determination of the reactivity ratios, sequence distribution

Determination of the reactivity ratios, sequence distribution

The 400 MHz proton NMR spectra of butyl acrylate (BA)—methyl methacrylate (MMA) copolymers prepared by free radical polymerization in solution at 323 K were used for the determination of the reactivity ratios. The reactivity ratios rM and rB calculated by the error‐in‐variables method are 2.279 and 0.395, respectively. The methoxy region of the MMA proton signal resonance was found to be

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stereocontrol of methyl methacrylate during photoinduced

Stereocontrol of Methyl Methacrylate during Photoinduced

Photosensitive alkoxyamine 2,2,6,6-tetramethyl-1-(1-phenylethoxy)piperidin-4-yl quinoline-2-carboxylate (PE-TEMPO-Q) was synthesized. Photochemical properties of PE-TEMPO-Q were studied to develop photoinduced nitroxide-mediated polymerization of methyl methacrylate (MMA). Rapid and facile polymerization at ambient temperature with PE-TEMPO-Q as an initiator was confirmed to proceed in a

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