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 17 of 17 for “"gel-state"”.
-
The Effect of Ionomer Architecture on the Morphology in Gel State Functionalized Sulfonated Syndiotactic Polystyrene
… the reaction in both the heterogeneous gel-state to obtain blocky copolymers and in the homogeneous solution state to obtain randomly functionalized copolymers. In order to compare both the thermal properties and morphology of these two systems several sets of samples were prepared at …
-
Tailored Chain Sequences of Brominated Syndiotactic Polystyrene Copolymers via Post-Polymerization Functionalization in the Heterogeneous Gel State
… method conducted in the heterogeneous gel state, and investigates the effect of sPS reaction state and sPS/solvent gel morphology on the copolymer microstructure and thermal properties. Gel-state (Blocky) brominated copolymers were prepared from a 10 w/v% sPS/carbon tetrachloride (CCl4) …
-
Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… ether ketone) (PEEK) through both solution-state and gel-state functionalization methods. The multiphase gel-state chemistry restricts functionalization to the amorphous regions of the semi-crystalline parent homopolymer and generates a copolymer with a blocky microstructure. Solution-state …
-
Crystallization Behavior, Tailored Microstructure, and Structure-Property Relationships of Poly(Ether Ketone Ketone) and Polyolefins
… acetone (DPA) was discovered as a novel, benign gelation solvent for PEKK, enabling heterogeneous gel-state bromination and sulfonation to afford blocky microstructures. The gel state functionalization process resulted in a blocky microstructure with runs of pristine crystallizable PEKK retained …
-
Processing and thermal properties of molecularly oriented polymers
… polyethylene sheets through stretching in the gel state. Tests have shown that bulk UHMW-PE can be stretched 50-80 times in xylene. The thermal conductivity of bulk UHMW-PE is 0.3 W/mK, while that of a sample stretched 20-25 times is over 4.5 W/mK.
-
A conjugated polymer plastic gel
We present a gel route to process highly oriented conjugated polymer films and fibers. The incorporation of hexafluoroisopropanol, a strong and stable dipolar group, to the polythiophene backbone enhances the solubility and especially, the hydrogen bond forming capabilities of the polymer. This …
-
Simulated Associating Polymer Networks
… network is formed and the system behaves like a gel. Telechelic networks are of interest since they are representative for biopolymer networks (e.g. F-actin) and are widely used in medical applications (e.g. hydrogels for tissue engineering, wound dressings) and consumer products (e.g. contact …
-
Design of PolyMOCs and the synthesis of crosslinkers for the BASP platform
… the desired BCPMOC networks in the bulk or gel state. In the second strategy, another orthogonal interaction is explored to create a different type of polyMOC. In this case, poly(methyl acrylate) (PMA) homopolymers are synthesized from initiators featuring a diene or dienophile on one end …
-
Phase Behavior, Microstructure and Mechanics of Colloid -Polymer Mixtures
… microstructure and the mechanical response of gels formed via short-range depletion attractions. First we highlight the failure of extant classical models to capture the observed phase behavior over a wide range of polymer-to-particle size asymmetries, particle volume fraction and solvent …
-
Towards Mechanochromic Devices using Biocompatible Hydroxypropyl Cellulose
… property has only been reported in the liquid state, and despite a good theoretical understanding, an applied characterisation of aqueous HPC’s mechanochromic colour-pressure response is lacking in the literature. In this thesis, a dynamic, structurally coloured HPC-gelatin hydrogel is …
-
Dynamics and mechanics of associating polymer networks
… of various types of associating polymers in the gel state through a combination of experiment and theory. By using forced Rayleigh scattering (FRS), phenomenological super-diffusion is revealed as a general feature in associating networks. Experimental findings are quantitatively explained by a …
-
Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate
… (at one high concentration indicative of polymer gel state, e.g., 8% w/w) are recommended to be performed on sodium alginate solutions to ensure interchangeability. Furthermore, among batches of the same grade, significant differences in rheological properties were observed, especially at the high …
-
Characterization of ethanol induced protein gels by ultra-small angle x-ray scattering and rheological measurements
Gelation is one of the main functions of food proteins. Protein gelation has been utilized to improve physical properties of protein-based products or for delivery of bioactive compounds. On the other hand, the control of gelation is very important to prevent formation of gel network which may …
-
Direct ink writing of microvascular networks
… microvascular networks within polymer and hydrogel matrices is demonstrated. In addition, the influence of network design of fluid transport efficiency is characterized. Planar microvascular networks composed of periodic lattices of uniformal microchannels and hierarchical, branching …
-
Dual-Responsive Polymer and Hybrid Systems: Applications for Gene Delivery and Hydrogels
… and pH) for physically cross-linked hydrogels. Initial studies on magnetic dual-responsive gene vectors revealed a facile synthesis of PDMAEMA-grafted iron oxide nanoparticles utilizing dopamine as physically binding anchor group for the polymer chains. Here, a dopamine-based ATRP …
-
Investigations on the Behaviour and Properties of Different Types of Unilamellar Vesicles
… of TTB and the system transforms from stiff gel state to liquid state with higher TTB concentration. Catanionic interaction between two oppositely charged parent-surfactants oleic acid and decyltrimethyl ammonium hydroxide (C10TAOH) is like an acid-base interaction. Phase behaviour of their …
-
Synthesis and characterization of thermosensitive hydrogels derived from polysaccharides
In this work, thermosensitive hydrogels having tunable thermo-mechanical properties were synthesized. Generally the thermal transition of thermosensitive hydrogels is based on either a lower critical solution temperature (LCST) or critical micelle concentration/ temperature (CMC/ CMT). The …