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Showing 1 to 20 of 25 for “"NIPAM"”.
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Synthesis of poly(NIPAM-co-vmbpy) microspheres and transition metal monomers for metallopolymeric material construction
<p>Poly-N-isopropylacrylamide (PNIPAM) gels grafted to redox-active metal monomers undergo sudden expansion-contraction activity in response to change in environmental conditions, such as temperature, pH, ion concentration, and oxidation states of the metal. The relevance of these conditions to …
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An Investigation of Poly(N-Isopropylacrylamide) for Applications with Microfluidic Paper-Based Analytical Devices
… poly(N-isopropylacrylamide), also known as P(NIPAM), was developed as a fluid delivery system for use with microfluidic paper-based analytical devices (microPADs). MicroPADs are postage-stamp-sized devices made out of paper that can be used as platforms for low-cost, simple-to-use …
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Co-polymer microgels: contemporary physico-chemical, structural and analytical investigations
Poly(N-isopropylacrylamide), [poly(NIPAM)], is a thermosensitive polymer which undergoes a conformational transition at approximately 32°C in aqueous solution. NIPAM is a monomer commonly employed in microgel synthesis and the resultant particles are thermosensitive, a property which can be altered …
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Synthesis, physico-chemical properties and potential applications of colloidal gel particles
Four new N-isopropylacrylamide (NIPAM) based particles have been synthesized and characterized. The first experimental chapter reports that fluorescent poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive …
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Colloidal microgels: synthesis, characterisation and applications
Four sets of NIPAM and non-NIPAM based colloidal microgels have been synthesized by a surfactant-free emulsion polymerisation (SFEP) technique, which are: (i) poly (NIPAM) based homo-polymer, (ii) poly (NIPAM) based co-polymer, (iii) hydrophobically modified homo-polymer and (iv) hydrophobically …
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Structure and dynamics of new intelligent copolymer hydrogels and hydrogel nanoparticle hybrids
… of hydrogels, poly(N isopropylacrylamide) (poly(NIPAM)) crosslinked with N,N' methylene-bisacrylamide (BIS) is the most well-known member of the class of thermoresponsive "smart" polymers. This work covers the characterization of thermoresponsive poly(NIPAM) gels an shows different kinds of …
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The development of novel smart wound dressings based on colloidal microgels and cotton fabric
… based on an N-isopropylacrylamide (NIPAM) monomer. Poly(NIPAM) is a thermo sensitive polymer which undergoes a conformational transition close to the human skin temperature. Poly(NIPAM) was co-polymerized with hydrophobic butyl acrylate (BA) to provide a more favourable environment …
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Colloidal microgels as (trans)dermal drug delivery systems
… (90%)-co-butyl acrylate (10%) (NIPAM/BA) (90/10)(w/w)%, in the presence of and in the absence of ibuprofen (IBU), methyl paraben (MP), and propyl paraben (PP), by a surfactant-free emulsion polymerisation (SFEP) in water. Physico-chemical properties of the microgels were …
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Interfacial Properties of Environmentally Responsive Polymers
… in the molecular properties of end-grafted NIPAM-N-Gly-(C18) 2 monolayers. At pH 8.0, where the glycine side chains are ionized, the polymers exhibit stereotypical polyelectrolyte behavior. Side chain neutralization at pH 5.0 causes a substantial decrease in the film thickness, and the …
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Synthesis and Crystallization of Anisotropic Polymer Colloids
… spheres are swollen with N-isopropylacrylamide (NiPAM) to give particles with a polystyrene seed part and a poly NiPAM protrusion that can be made hydrophilic or hydrophobic depending on temperature. Evidence is given that chemical anisotropy has been developed for these particles. For future …
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Synthesis and characterization of stimuli-responsive microgels based on poly(glycidol)block copolymers
… masses were successfully employed in ATRP of NIPAM and 4VP to give well-defined stimuli sensitive block copolymers of targeted molar ratio of blocks. The results obtained from light scattering methods showed formation of stable aggregates upon stimuli (pH or temperature) by all the obtained …
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Cone Beam Optical Computed Tomography-Based Gel Dosimetry
… an optically scattering N-isopropylacrylamide (NIPAM)-based polymer gel, with the same comparison criteria. Full treatment process quality assurance is also possible using a NIPAM dosimeter in-phantom, but is limited in its accuracy due to the inherent difficulty of managing the effects of stray …
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Thermoresponsive Glycopolymers via Controlled Radical Polymerization (RAFT) for Biomolecular Recognition
… artificial organs. Poly(N-isopropylacrylamide) (PNIPAM) is one of the most widely studied polymers due to its lower critical solution temperature (LCST) at ~ 32° C in aqueous solution. Additionally, glycopolymers, where free sugar units are present, have potentially interesting applications …
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Controlling the interfacial behaviour of colloidal microgel systems
… polymerization of N-isopropylacrylamide (NIPAM) with more hydrophobic vinyl ether/ester/silane co-monomers (10 % total mass monomer). Most of the resultant dispersions were novel co-polymer microgels and all exhibited a thermo-sensitive volume phase transition. Key properties of the …
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Experimental spectroscopic and theoretical studies of organic compounds and polymeric structures
… poly(N-isopropylacrylamide/4-vinylpyridine) [poly(NIPAM/4-VP)] microgels (the latter synthesized using percentage composition of 4-VP in the range of 7.5 – 90 %, w/w in the original reaction mixture) were prepared by surfactant-free emulsion polymerization. Freeze-dried samples of the microgels …
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Auswirkungen eines inneren Polymerskeletts auf liposomale Membranen
Die hydrophilen Monomere N-Isopropylacrylamid (NIPAM) bzw. 4-Hydroxy-propylmethacrylat werden mit dem Vernetzer Tetraethylenglycoldimethacrylat (TEGDM) in künstliche Membranvesikel aus Phospholipid-Doppelschichten (Liposo-men) eingeschlossen. In die liposomale Membran sind 2 mol eines reaktiven …
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Inorganic/organic hybrid polymers
… of either N-Isopropylacrylamide (NIPAM) or styrene with vinyltrimethoxysilane and the intercalation of styrene or NIP AM into montmorillonite. All samples were characterised using a range of instrumental techniques including infrared spectroscopy (IR), nuclear magnetic resonance …
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Exploring new materials for caloric cooling
… smart polymer, poly(N-isopropylacrylamide) [p(NIPAM)], and its acidic functional derivative, by using changes in solvent concentrations and pH to drive a first-order conformational phase transition. The caloric responses from these previously unexplored caloric driving fields, herein termed …
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Amphiphilic BAB-triblock copolymers bearing fluorocarbon groups : synthesis and self-organization in aqueous media
… monomers such as N-isopropylacrylamide (NIPAM) (M1) as well as N-acryloylpyrrolidine (NAP) (M2) for the A-blocks and of the hydrophobic monomers styrene (M3), 2-fluorostyrene (M4), 3-fluorostyrene (M5), 4-fluorostyrene (M6) and 2,3,4,5,6-pentafluorostyrene (M7) for the B-blocks. The …
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POLY(N-ISOPROPYL ACRYLAMIDE)-COATED SURFACES: INVESTIGATION OF CYTOTOXICITY WITH MAMMALIAN CELLS AND THE MECHANISM OF CELL DETACHMENT
… such material is poly(N-isopropyl acrylamide), (pNIPAM), which undergoes a conformation change in a physiologically relevant temperature range to release intact mammalian cell monolayers capable of being used to engineer tissues. Two factors currently limit the use of cell sheets for this purpose: …
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