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 72 for “"triblock copolymers"”.
-
Amphiphilic BAB-triblock copolymers bearing fluorocarbon groups : synthesis and self-organization in aqueous media
… end- group analysis of the synthesized block copolymers via 1H-, 19F-NMR, and in some cases also UV-vis spectroscopy, were performed attaching suitable fluorinated moieties to the Z- and/or R-groups of the CTAs. Symmetric triblock copolymers of type BAB and non-symmetric fluorine end- capped …
-
Application of PEO-PPO-PEO Triblock Copolymers in Synthesis of Silica and Organosilica Nanomaterials
… work focused on the application of Pluronic triblock copolymers, poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO), in the synthesis of mesoporous material, such as double-helical silica nanotube structures as well as bridged organosilica nanotubes by using swollen …
-
Characterization, orientation, and deformation behavior of the double gyroid phase in elastomeric triblock copolymers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
-
The multifarious self-assembly of triblock copolymers : from multi-responsive polymers and multi-compartment micelles
New ABC triblock copolymers were synthesized by controlled free-radical polymerization via Reversible Addition-Fragmentation chain Transfer (RAFT). Compared to amphiphilic diblock copolymers, the prepared materials formed more complex self-assembled structures in water due to three different …
-
Synthesis and characterization of hafnium and molybdenum bifunctional initiators for the preparation of triblock copolymers
Chapter 1. Three monofunctional mixed alkyl hafnium complexes containing the (MesNpy)2 ligand ([(MesitylNCH2)2CMe(2-CsH4N)]2) were synthesized. (MesNpy)Hf(Neo)R ((2b), R = Me; Neo = CH2CMe2Ph) and (MesNpy)Hf(CH2TMS)(R), ((3b), R = Me and (4b), R = i-Bu)) were activated with {Ph3C} {B(C6F5)4} and …
-
A comparison of AB diblock and ABA triblock copolymers of polystyrene and polyferocenylsilane for nanolithography applications
… have looked at several combinations of block copolymers we focus on the use of solvent annealing as a method to tune the morphology of PS-b-PFS and PS-b- PFS-b-PS block copolymers. These polymers have shown promise as precursors to a variety of materials and in particular this combination of …
-
Preparation of Nitrile Containing Siloxane Triblock COpolymers and Their APplication As Stabilizers For Siloxane Magnetic Fluids
Nitrile containing siloxane block copolymers were developed as stabilizers for siloxane magnetic fluids. The siloxane magnetic fluids have been recently proposed as internal tamponades for retinal detachment surgery. PDMS-b-PCPMS-b-PDMSs (PDMS = polydimethylsiloxane, PCPMS = …
-
Design, Synthesis and Characterisation of Amphiphilic Symmetrical triblock copolymers by the RAFT process : their self-organisation in dilute and concentrated aqueous solutions
… of symmetrical amphiphilic ABA and BAB triblock copolymers in dilute, semi-concentrated and highly concentrated aqueous solution. A series of new bifunctional bistrithiocarbonates as RAFT agents was used to synthesise these triblock copolymers, which are characterised by a long …
-
Examining Structure-Morphology-Property Relationships of Novel Styrenic-Based Macromolecules for Emerging Applications
For the first time, triblock copolymers of novel styrenic-based macromolecules were investigated in detail and examined for structure-morphology-performance relationships. We were able to design novel imidazolium- and phosphonium-containing styrenic macromolecules using controlled radical …
-
Fully-renewable and degradable thermoplastic elastomers.
… as the middle block in a PLA-containing ABA triblock copolymer. Tensile measurements demonstrated impressive elongations and elastomeric properties typical of thermoplastic elastomers, however, the materials were relatively weak. The tensile properties of the polymers were found to be highly …
-
Effets des agents interfaciaux copolymères tribloc sur le comportement en rupture et en écoulement du mélange de polystyrène/caoutchouc-éthylène-propylène
In a previous study two triblock copolymers of styrene/ethylene - butylene/styrene (SEBS), of different molecular weights, were used to compatibilize a blend of 80 volume % of polystyrene (PS) and 20 volume % of ethylene - propylene rubber (EPA). The aim of this work is to foster the understanding …
-
Development of Thermoplastic Elastomers with Improved Elastic Properties Based on Semicrystalline Block Copolymers
… ester)s with semicrystalline hard segments and triblock copolymer soft segments. The second class of TPEs are systems based on ABA and ABC triblock copolymers with two glassy and one or two semicrystalline end blocks, respectively. The used strategy for increasing the elasticity of conventional …
-
Development of Sustainable Thermoplastic Elastomers
… acrylate)-b-styrene) (SAS) triblock copolymers containing a rubbery midblock derived from fatty acids were designed with targeted properties appropriate for thermoplastic elastomer applications. Well-defined polymers with desired compositions and controlled molecular weight …
-
Polymer Stabilized Magnetite Nanoparticles and Poly(propylene oxide) Modified Styrene-Dimethacrylate Networks
… dispersions using well-defined, non-toxic, block copolymers, so that the resultant magnetite-polymer complexes can be used in a range of biomedical materials. Hydrophilic triblock copolymers with controlled concentrations of pendent carboxylic acids were prepared. The triblock copolymers contain …
-
Synthesis and self-assembly of multiple thermoresponsive amphiphilic block copolymers
… self-assembly of multi thermoresponsive block copolymers in dilute aqueous solution was investigated by a combination of turbidimetry, dynamic light scattering, TEM measurements, NMR as well as fluorescence spectroscopy. The successive conversion of such block copolymers from a hydrophilic into …
-
Non-Covalent Interactions in Block Copolymers Synthesized via Living Polymerization Techniques
… controlled radical polymerization of triblock copolymers. Complementary hydrogen bonding triblock copolymers containing adenine (A) and thymine (T) nucleobase-functionalized outer blocks were synthesized. Hydrogen bonding interactions were observed for blends of the complementary …
-
Synthesis, Characterization, and Properties of Tailored Functional Block Copolymers
… and application of functional block copolymers (BCP) based on a polymer analogous approach and includes three main subjects. The first subject is the implementation of a specially constructed reactor setup for sequential anionic polymerization that allows parallel block copolymer …
-
Synthesis and Characterization of Zwitterion-Containing Acrylic (Block) Copolymers for Emerging Electroactive and Biomedical Applications
… Dynamic mechanical analyses (DMA) of the copolymers showed a rubbery plateau region due to physical crosslinks between charges for zwitterionomers only. We attributed improved microphase-separation and superior elastomeric performance of the zwitterionomers to stronger association between …
-
Structure and Dynamics of Polymers: From Bulk Solutions to Single Polymer Translocation
… Chapter 3 studies the sol-gel transition of triblock copolymers. Chapter 4 and 5 investigate the translocation of a single polymer through a nanopore, focusing on the polymer translocation dynamics under external driving forces and the distribution of ions and water molecules inside …
-
Synthesis of Silicone Magnetic Fluids for Use in Eye Surgery
… (PDMS-PCPMS-PDMS) triblock copolymers as steric stabilizers. A series of the polysiloxane triblock copolymers with systematically varied molecular weights were prepared via anionic polymerization using LiOH as an initiator. These copolymers formed micelles in toluene …
Page 1 of 4