Research Center for Engineering of
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Title: An innovative synthetic approach toward the preparation of structurally-defined multiresponsive polymer (co)networks
Published In: Advanced Functional Materials
Description: The development of new, simple and cost-effective synthetic concepts that could lead to the generation of architec-turally-defined polymeric materials has been a great target in modern polymer chemistry. In this report, a new and facile synthetic approach employed for the fabrication of multiresponsive polymer conetworks characterized by predefined architecture and compo-sition is described for the first time. The presented methodology involves the crosslinking of well-defined 2-dimethyl aminoethyl (DMAEMA) homopolymers and polyDMAEMA-containing diblock and triblock copolymers prepared by Reversible Addition Fragmentation chain Transfer (RAFT) controlled radical polymerization, using 1,2-bis-(2-iodoethoxy)ethane (BIEE) as the crosslinker. Unlike in other controlled polymerization methods used for the synthesis of well-defined polymer structures, herein the crosslinking step is undemanding since no special synthetic requirements are necessary such as heat and inert conditions. Most im-portantly it enables the encapsulation of inorganic nanoparticulate systems within the 3-dimensional polymer structures, resulting to the generation of polymer-based nanocomposite (co)networks with structurally-defined characteristics. The BIEE-crosslinking step of polyDMAEMA homopolymers and DMAEMA-containing diblock and triblock copolymers of different structures and composi-tions has been carried out in the presence of pre-formed oleic acid-coated magnetite (Fe3O4) nanoparticles. Their swelling behav-iour has been investigated in organic and aqueous media at different pHs. Moreover, the magnetic response of the Fe3O4-cotaining crosslinked (co)networks has been studied by means of vibrational sample magnetometry, demonstrating their superparamagnetic behaviour at room temperature. This new approach may be easily expanded to generate structurally-defined multiblock (and hence multifunctional) copolymer conetworks and organic-inorganic nanocomposites.
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Publication year: 2014
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Authors: ACHILLEOS Mariliz , DEMETRIOU , MARINICA (BALAU) Oana , VEKAS Ladislau , KRASIA-CHRISTOFOROU Theodora ,
Type: International Journal Article
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Laboratory: Rheology Laboratory
Institution: UPT