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 20 of 27 for “"star polymers"”.
-
Amphiphilic star polymers as solubilizing agents for environmental spearations
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
-
Star Polymers and Dendrimers Based on Highly Functional Resorcin- and Pyrogallolarenes
… were used as platform for the synthesis of novel star polymers and dendritic structures. The objectives of this work can be portrayed under the following points: First: Synthesis and modification of calix[4]resorcin- and calix[4]pyrogallolarenes with a varying number and varying type of functional …
-
The Synthesis and Study of Dendrimers and Star Polymers Without Cores
Dendrimers having 16, 24, 32, or 64 alkene groups were synthesized and intramolecularly cross-linked. The combined use of MALDI-TOF MS and SEC analysis of the resulting structures indicated that in each case, as the degree of dendrimer cross-linking increased, its radius of gyration (Rg) decreased …
-
Design and development of Brush-Arm Star Polymers for applications in drug delivery
… of a unique polymer architecture - the Brush-Arm Star Polymer (BASP) - that represents a modular, customizable therapeutic platform with potential in drug delivery. In this thesis, BASPs are synthesized by ring opening metathesis polymerization (ROMP) of a norbornene functionalized PEG-based …
-
Part I. Supramolecular Star Polymers Based on Ditopic Hydrogen-Bonding Modules. Part II. The Concept of Fidelity as a Framework for Evaluating the Behavior of Complex Supramolecular Systems
There is currently no common framework to discuss the quality of these more complex multi-component recognition systems. Part 2 of this dissertation reports undesired, cross-recognition in several commonly used triply and quadruply hydrogen-bonded complexes to assess the likelihood of orthogonal …
-
Development of novel polymeric nanoparticles with tailored architectures and functionalities/
… nanoparticle architecture called a brush-arm star polymer (BASP), which has polymer brushes on the periphery shielding the core. Such nanoparticles were synthesized by, first, "graft-through" ring-opening metathesis polymerization (ROMP) of a norbornene-macromonomer to create the brush-arms, …
-
Honeycomb structured porous films from different polymer architectures - preparation, mechanism, analysis and post-treatment
… polymer architectures ranging from linear, comb, star polymers and a random copolymer. Four casting methods were designed and applied for the production of structured porous materials. The airflow casting technique, cold-stage casting technique, casting on water technique and emulsion casting …
-
Infululence of Polymer Nanoparticles on the Dewetting of Polymer Thin Films
The influence of polystyrene star based nanoparticles on the dewetting of spun-cast linear polystyrene (PS) films on Si/SiOx surfaces is investigated as a function of temperature, concentration and type of the nanoparticles. The star polymers have polystyrene-benzocyclobutene copolymer arms which …
-
Solution and Adsorption Characterization of Novel Water-Soluble Ionic Block Copolymers for Stabilization of Magnetite Nanoparticles
… with polymer brush layers using adapted star polymer models for brush extension and pair potential. Block copolymer micelles were first utilized for experimental validation by using the brush extension model to predict the size and the interaction model to predict the second virial …
-
Single molecule studies of branched polymer dynamics in non-dilute solutions
The macroscopic properties of polymers are dictated by their molecular architecture and microstructure. Branched polymers exhibit a multitude of distinct rheological phenomena, such as shear thinning and enhanced strain hardening, compared to linear polymers as a direct consequence of their …
-
Rheology of polyelectrolyte multilayer modified suspension
… properties. Prominent examples are multiarm star polymers, microgels, thermosensitive colloids, and depletion gels. These systems are tailored to correlate microscopic interactions with macroscopic behavior, which is poorly understood for complex systems. The interparticle interactions are …
-
Diffusion of a rodlike virus in complex solutions
… been done using probes ranging from linear and star polymers to various colloidal particles; however, relatively few studies have used rodlike probes. Rodlike probes are potentially more interesting due to the added information that may be gained by following rotational as well as translational …
-
Design of PolyMOCs and the synthesis of crosslinkers for the BASP platform
… integration of metal-organic cages (MOCs) into polymers were explored. The first strategy creates Block Co-PolyMOCs (BCPMOCs), which feature the integration of MOCs into block copolymers (BCPs). In the first assembly step, BCPs functionalized with a bispyridyl ligand on the chain end undergo Pd …
-
Development of novel polymeric architectures for applications in drug delivery and studies towards the synthesis of perfect polymers by iterative exponential growth "Plus" (IEG+)
… for the formation of acid-degradable brush-arm star polymers (BASPs) via the brush-first ring-opening metathesis polymerization (ROMP) method. A bis-norbornene acetal structure was identified that, when employed in conjunction with a poly(ethylene glycol) (PEG) macromonomer, provided highly …
-
Novel Routes for the Design of Poly((meth)acrylic acid) Containing Polymer Structures by Controlled Radical Polymerization
Easy preparation of specialty polymers containing poly((meth)acrylic acid) Poly(acrylic 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 …
-
Fracture Mechanics of Networks
… connectivity. End-linking then deswelling star polymers produces a class of elastomers with low defects and no trapped entanglements, enabling ultrahigh straininduced crystallinity of up to 50% and stretchability that scales beyond the saturated limit. These features promote a pronounced …
-
Design of Cleavable Monomers and Cross-Linkers for the Synthesis of Degradable Polymer Architectures
… introduction of labile bonds to already known polymers offers, thus, a much simpler approach for the manufacture of degradable materials. Here, we report the design of cleavable monomers and cross-linkers for the synthesis of degradable materials with different polymer architectures. The first …
-
Synthesis and applications of core functional hyperbranched polyglycerol
… describes two methods for the synthesis of the polymers and its formal [3+2] cycloaddition with organic azides in the presence of copper, commonly referred to as click chemistry. The two methods allow preparation of low molecular weight polymers, MW < 10,000 g/mol and high MW > 100,000 g/mol. …
-
Glassy viscoelasticity of dense suspensions of soft colloids and structure & miscibility of soft filler polymer nanocomposites
… finite range soft repulsive particles (many arm star polymers and microgel-like Hertzian spheres). The alpha relaxation time in the activated hopping regime is a rich function of volume fraction and temperature, including exhibiting a maximum value at ultra-high volume fraction due to a soft …
Page 1 of 2