Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"PMAA"”.
-
Environmental Factors Affecting Pre-Maturity <i>Alpha</i>-Amylase Activity in Winter Wheat (<i>Triticum aestivum</i>)
Pre-maturity <i>alpha</i>-amylase activity (PMAA) in the absence of sprouting is one of four causes of low Hagberg falling number (HFN) in UK winter wheat (<i>Triticum aestivum</i>), reducing the quality and value of milled flour. Other causes include the retention of pericarp <i>alpha</i>-amylase …
-
Micelles and Interpolyelectrolyte Complexes formed by Polyisobutylene-block-Poly([meth]acrylic acid) - Synthesis of Polymers and Characterization in Aqueous Solutions
In this work PIB-b-PMAA copolymers with low PDI were studied, which self-assemble in aqueous solutions. A wide range of hydrophobic and hydrophilic block lengths were synthesized via combination of cationic an anionic polymerization. The data we have obtained by means of SANS and DLS point to an …
-
Polyelectrolyte Complexes and their Therapeutic Potential
… shell consisting of an IPEC between P2VPq and PMAA is present and finally a corona of excess PMAA stabilizes the micelles in aqueous solution. At sufficiently high pH a portion of the corona carries negative charges, which were then used to form further IPECs with either cationic homopolymers …
-
Weak polyacid brushes : synthesis, swelling behavior, complex formation and micropatterning
… of the properties of poly(methacrylic acid) (PMAA) brushes, a weak polyelectrolyte whose charge density can be tuned by adjustment of external parameters such as the solution pH-value. The PMAA brushes were swollen in aqueous solutions of different ionic composition and their properties were …
-
Surface modification of polymer membranes by self-organization
… backbones and POEM or poly(methacrylic acid) (PMAA) side chains are prepared. PVDF membranes prepared in a single step from blends containing >5 wt % PVDF-g- POEM are spontaneously wettable by water. Similarly prepared membranes containing 10 wt % PVDF-g-PMAA are environmentally-responsive, in …
-
Modification of nanoparticle surfaces for emulsion stabilization and encapsulation of active molecules for anti-corrosive coatings
… of an adsorbed weak polyelectrolyte layer (e.g. PMAA, PAH) influence the wettability of nanoparticles (e.g. alumina, silica, see Scheme 1(b)). Furthermore, the isoelectric point and the pH range of colloidal stability of particle-polyelectrolyte composites depend on the thickness of the weak …
-
Self-Organized Nanostructures from Stimuli-Responsive Triblock Terpolymers
… hydrolysis of PtBMA to poly(methacrylic acid) (PMAA) or quaternization of PDMAEMA to PDMAEMAq, terpolymers with weak or strong polyelectrolyte blocks were generated. Consequently, choosing the appropriate preparation pathway allowed control over the size, architecture, and charge of the micellar …
-
Functional Triblock Terpolymers for Multicompartment Micelle and Janus Particle Synthesis
… to have one PHS and one poly(methacrylic acid) (PMAA) hemicylinder, resulting in water-soluble particles. Further, solution structures of tSBD and tSBT triblock terpolymers were investigated. In water, tSBD formed core-corona micelles that exhibited pH-responsive and LCST behavior due to the …
-
Novel Routes for the Design of Poly((meth)acrylic acid) Containing Polymer Structures by Controlled Radical Polymerization
… acid) (PAA) and poly(methacrylic acid) (PMAA) are well-known polymers in a high number of applications because of their pH-responsive nature, their hydrophylic characteristics and for their interaction with metal ions. PAA, high tech material An increasing part of high tech polymer …
-
Engineering the microfabrication of layer-by-layer polyelectrolyte assembly
… acid) (PAA) and poly(methacrylic acid) (PMAA) were adsorbed at pH 2.5. 4.8, 7, and IO on patterned COOH and EG SAMs to determine optimal patterned deposition conditions. Each polyacid and polyamine had a secondary interaction that changed the affinity of the multi layers for the COOH and …
-
Functional Nanostructures from well-defined Block Copolymers: Stimuli-responsive Membranes, Multicompartment Micelles, and Interpolyelectrolyte Complexes
… elektrostatisch induzierte IPEC-Bildung zwischen PMAA und P2VPq geformt werden. PEO diente als stabilisierende Corona der neu gebildeten Strukturen. Die zeitliche Entwicklung solcher Aggregate wurde weiter untersucht und sternförmige Zwischenzustände konnten identifiziert werden. Abschließend …
-
Complex nanostructures in triblock terpolymer thin films
… forces exerted on the strongly swollen PMAA. In contrast to the PL phase core-shell cylinders oriented parallel to the interfaces cannot withstand these forces and are solubilised at high pH-values.
-
NMR/MRI SIGNAL ENHANCEMENT BY REVERSIBLE EXCHANGE (SABRE) AND HETEROGENEOUS SABRE (HET-SABRE)
… catalysts to support materials comprised of TiO2/PMAA (poly methacrylic acid) and PVP (polyvinyl pyridine), respectively, and characterized by AAS, NMR, and DLS. Following pH2 delivery to mixtures containing one type of "nano-SABRE" catalyst, a target substrate, and ethanol, up to ~(-)40-fold and …
-
Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
Freeze casting is a colloidal processing technique that shows great promise for development of nanostructured materials. A ceramic nanopowder is dispersed with a polymer in water, under carefully controlled pH. The suspension is cast into a suitable mold and frozen, then de-molded and exposed to a …