NDLI: An improved grafting technique for producing imprinted thin film composite beads

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Back cover

Polymer Chemistry Vol - 3 Issue - 3

Polymer Chemistry Vol - 3 Issue - 2

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

An improved grafting technique for producing imprinted thin film composite beads

Content Provider	Royal Society of Chemistry (RSC)
Author	Schillinger, Eric Titirici, M. Magdalena Sulitzky, Claudia Halhalli, Mahadeo R. Sellergren, Börje Aureliano, Carla S. A.
Copyright Year	2012
Abstract	Thin molecularly imprinted polymer (MIP) films were grafted from porous silica using immobilized azoinitiators in the absence or presence of RAFT mediated control or by controlled radical polymerization using immobilized iniferters. The resulting composites were compared in terms of film thickness, the grafted layer homogeneity, effect of different support morphologies and their chromatographic performance regarding enantioselectivity, and efficiency. Film thickness was controlled either kinetically by interrupted polymerization or stoichiometrically based on complete monomer conversion. Thus, L-phenylalanine anilide (L-PA) imprinted poly(MAA-co-EDMA) silica composites prepared by the former technique using the iniferter modified supports exhibited heterogeneous distribution of grafted polymer as shown by the absence of correlations between the pore system parameters and the graft density. This contrasted with the linear correlations observed by both the kinetic and stoichiometric grafting techniques based on azoinitiator or RAFT modified supports indicating that these exhibit homogeneous grafted films. These results were corroborated by chromatographic tests. Whereas the iniferter composites produced by interrupted polymerization were not capable of racemic resolution and generally showed very low or non-existent enantioselectivity, the azo-composites showed a pronounced enantioselectivity which was strongly dependent on the film thickness, monomer dilution, the RAFT/initiator ratio and the method of grafting. Hence, composites prepared by exhaustive polymerization under dilute conditions using high RAFT/initiator ratios displayed strongly enhanced chromatographic performance in terms of retentivity and enantioselectivity.
Starting Page	1033
Ending Page	1042
Page Count	10
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	3
Issue Number	4
Journal	Polymer Chemistry
DOI	10.1039/c2py00544a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Stoichiometry Phenylalanine Living free-radical polymerization Polymerization Polymer Grafting Silicon dioxide Chromatography Racemic mixture Aniline Molecularly imprinted polymer Monomer Remanence
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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