Tailored “Grafting‐From” Functionalization of Microfiltration Membrane Surface Photo‐Initiated by Immobilized Iniferter

He, Dongming; Ulbricht, Mathias

doi:10.1002/macp.200900069

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…A novel methylacrylic monomer iniferter was chemically tethered to the growing polymeric backbone, enabling the production of photopatternable grafted polymer networks. , Nishida, Endo, and co-workers investigated a graft polymerization of vinyl monomers on a photoiniferter precoated solid material under UV irradiation; controlled radical polymerization of vaporized monomers on the solid surface was achieved . By immobilizing photoiniferters on polypropylene microfiltration membranes, the Ulbricht group achieved surface-selective graft functionalization, promoting the preparation of advanced macroporous membranes with a wide range of functional properties.…”

Section: Applicationsmentioning

confidence: 99%

Light-Controlled Radical Polymerization: Mechanisms, Methods, and Applications

2016

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The use of light to mediate controlled radical polymerization has emerged as a powerful strategy for rational polymer synthesis and advanced materials fabrication. This review provides a comprehensive survey of photocontrolled, living radical polymerizations (photo-CRPs). From the perspective of mechanism, all known photo-CRPs are divided into either (1) intramolecular photochemical processes or (2) photoredox processes. Within these mechanistic regimes, a large number of methods are summarized and further classified into subcategories based on the specific reagents, catalysts, etc., involved. To provide a clear understanding of each subcategory, reaction mechanisms are discussed. In addition, applications of photo-CRP reported so far, which include surface fabrication, particle preparation, photoresponsive gel design, and continuous flow technology, are summarized. We hope this review will not only provide informative knowledge to researchers in this field but also stimulate new ideas and applications to further advance photocontrolled reactions.

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Section: Applicationsmentioning

confidence: 99%

Light-Controlled Radical Polymerization: Mechanisms, Methods, and Applications

2016

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“…A slightly different approach was shown by Ulbricht and colleagues, who modified hydrophilized PP microfiltration membranes by utilizing three straightforward solid phase reactions. First, aminolysis was executed to introduce amino groups onto the surface, followed by a reaction with 2-bromoisobutyryl bromide introducing a bromine leaving group at the surface which was finally reacted with DC-H leading to an iniferter-modified PP-surface from which a copolymer of AAm and ethylene glycol dimethacrylate were polymerized [ 127 ].…”

Section: Light Mediated Controlled Radical Polymerization From Surfacesmentioning

confidence: 99%

Surface-Immobilized Photoinitiators for Light Induced Polymerization and Coupling Reactions

2022

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Straightforward and versatile surface modification, functionalization and coating have become a significant topic in material sciences. While physical modification suffers from severe drawbacks, such as insufficient stability, chemical induced grafting processes efficiently modify organic and inorganic materials and surfaces due to covalent linkage. These processes include the “grafting from” method, where polymer chains are directly grown from the surface in terms of a surface-initiated polymerization and the “grafting to” method where a preformed (macro)-molecule is introduced to a preliminary treated surface via a coupling reaction. Both methods require an initiating species that is immobilized at the surface and can be triggered either by heat or light, whereas light induced processes have recently received increasing interest. Therefore, a major challenge is the ongoing search for suitable anchor moieties that provide covalent linkage to the surface and include initiators for surface-initiated polymerization and coupling reactions, respectively. This review containing 205 references provides an overview on photoinitiators which are covalently coupled to different surfaces, and are utilized for subsequent photopolymerizations and photocoupling reactions. An emphasis is placed on the coupling strategies for different surfaces, including oxides, metals, and cellulosic materials, with a focus on surface coupled free radical photoinitiators (type I and type II). Furthermore, the concept of surface initiation mediated by photoiniferters (PIMP) is reviewed. Regarding controlled radical polymerization from surfaces, a large section of the paper reviews surface-tethered co-initiators, ATRP initiators, and RAFT agents. In combination with photoinitiators or photoredox catalysts, these compounds are employed for surface initiated photopolymerizations. Moreover, examples for coupled photoacids and photoacid generators are presented. Another large section of the article reviews photocoupling and photoclick techniques. Here, the focus is set on light sensitive groups, such as organic azides, tetrazoles and diazirines, which have proven useful in biochemistry, composite technology and many other fields.

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“…However, the research to date tends to focus on improving the OSN performance of neat ceramic membranes rather than exploring the ideal structure of the grafted membranes. Two different approaches can be applied for covalently grafting porous membranes, (i) grafting of the internal surface of the membrane pores to obtain smaller pore size [12,[20][21][22][23] and (ii) covering the membrane surface without shrinkage of the ceramic pore [24][25][26].…”

Section: Introductionmentioning

confidence: 99%