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Showing 1 to 20 of 36 for “"telechelic"”.
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Topology and Telechelic Functionality Control in Polyester Design
… diacrylate. The oligomeric polyesters with telechelic hydroxyl functionality were synthesized from renewable monomers, adipic acid, succinic acid, and 1,3-propanediol using melt polycondensation. The molecular weights of the precursors were varied systematically to probe the influence of …
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Synthesis and Characterization of Novel Telechelic High Performance Polyester Ionomers
… group, SSBA, were successfully incorporated in a telechelic fashion. For comparison, polyesters containing telechelic alkyl groups with controllable molecular weights were also synthesized. Furthermore, ionic copolymers of dimethyl isophthalate and trans-cyclohexane dicarboxylate, dimethyl …
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Structure-property behavior of elastomeric telechelic ionomers in bulk and solution
… behavior of two types of elastomeric telechelic ionomers has been investigated. Sulfonated polyisobutylene telechelic ionomers were studied in both bulk and solution. The bulk mechanical properties of carboxylated polyisoprene telechelic ionomers were also investigated. The sulfonated …
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Telechelic Polyetherimides with Functionalized End Groups for Enhancement of Mechanical Strength, Flame Retardancy, and Optical Properties
This thesis focuses on understanding the factors that affect the properties of polyetherimide (PEI) and improving the properties. As a high-performance thermoplastic resin, the first challenge in PEI application is its high processing temperature and viscosity. Therefore, two supramolecular …
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Synthesis and characterization of m-aminophenoxide functionalized poly(tetramethylene oxide)
… with m-aminophenoxide to produce aromatic amine telechelic PTMO of controlled molecular weight and narrow molecular weight distribution. TrifHc anhydride was used to initiate a bifunctional cationic living polymerization of tetrahydrofuran (THP). An anhydrous solution of m-aminophenoxide was used …
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Simulated Associating Polymer Networks
<p>Telechelic associating polymer networks consist of polymer chains terminated by endgroups that have a different chemical composition than the polymer backbone. When dissolved in a solution, the endgroups cluster together to form aggregates. At low temperature, a strongly connected reversible …
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Structural and morphological characterization of model elastomeric ion containing polymers
… locations along the polymer backbone such as the telechelic ionomers, block ionomers, or the segmented ionomers where the ionene polymers serve as an example. The structure-property behavior of all these three types of ionomers have been investigated in this study. The telechelic ionomers were …
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Structure and Dynamics of Polyhedral Oligomeric Silsesquioxane (POSS) and Poly(Ethylene Glycol) (PEG) Based Amphiphiles as Langmuir Monolayers at the Air/Water Interface
… and a new class of novel polymeric surfactants, telechelic (POSS-PEG-POSS) and hemi-telechelic (POSS-PEG) polyhedral oligomeric silsesquioxane (POSS) derivatives of PEG. PEO with number average molar mass, Mn > ~ 18 kg·mol-1 form stable spread Langmuir films at the A/W interface, while oligomeric …
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Liquid State Theory of Equilibrium Structure and Thermodynamics of Block Copolymer Melts and Solutions
… x-ray and neutron scattering experiments on telechelic and multiblock copolymers has also been made.
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Structure-property relationships in novel ionomers
It is observed for the first time that telechelic ionomers based on sulfonated polyisobutylene exhibit primary and secondary SAXS peaks when the molecular weight distribution is narrow (Mw/Mn ca. 1.15). These SAXS peaks are interpreted as due to non-global lamellar or cylindrical ionic domain …
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Synthesis and Characterization of Multiblock Copolymers for Proton Exchange Membrane Fuel Cells (PEMFC)
… poly(2,5-benzophenone) activated aryl fluoride telechelic oligomers with different block molecular weights were then successfully synthesized by Ni (0)- catalyzed coupling of 2,5-dichloro-benzophenone and the end-capping agent 4-chloro-4'-fluorobenzophenone or 4-chlorophenly-4′-fluorophenyl …
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Synthesis and Characterization of Branched Macromolecules for High Performance Elastomers, Fibers, and Films
… A2 + B3 polymerization of phenol endcapped telechelic poly(arylene ether sulfone) oligomers (A2) and tris(4-fluorophenyl) phosphine oxide (B3) in solution. Highly branched poly(ether ester)s were also synthesized in the melt phase using the oligomeric A2 + B3 polymerization strategy. Melt …
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Synthesis and Characterization of Multicomponent Polyesters via Step-growth Polymerization
… ionomers in detail. Three series of random and telechelic PET ionomers with equivalent molecular weights and ionic contents were synthesized using conventional melt polymerization. Solid state sodium NMR spectroscopy and melt rheological analysis demonstrated that the stability of ionic …
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Synthesis and Characterization of Hydrophilic-Hydrophobic Disulfonated Poly(Arylene Ether Sulfone)-Decafluoro Biphenyl Based Poly(Arylene Ether) Multiblock Copolymers for Proton Exchange Membranes (PEMs)
… interchanges between hydrophobic and hydrophilic telechelic oligomers via a nucleophilic aromatic substitution mechanism. The hydrophilic blocks were based on the nucleophilic step polymerization of 3,3′-disulfonated, 4,4′-dichlorodiphenyl sulfone with an excess 4,4′-biphenol to afford phenoxide …
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Part I - Access to UV photocured nanostructures via selective morphological trapping of block copolymer melts. Part II - Morphological phase behavior of poly(RTIL) containing block copolymer melts
… nanorod stacked structures. However, when a telechelic polymer is introduced into the system containing both supramolecular motifs (one on each end), a network is formed between the nanorod assemblies. Without the telechelic polymer, the supramolecular material is a viscous liquid with little …
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Studies of the cationic polymerisation of vinylic and energetic cyclic ether monomers
… A series of di-, tri- and tetrafunctional telechelic polymers has been synthesised. In order to optimise the system, achieve controlled molecular weight polymers and understand the mechanism of polymerisation the effects of certain parameters on the molecular weight distribution, as …
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Accessing Model, Functional Polyolefins and Polyolefin Copolymers with Ring-Opening Metathesis Polymerization
… Chapter 2 describes the synthesis of epoxy-telechelic polyalkenamers and polyolefins made by ROMP of a cyclooctene-based monomer with difunctional chain-transfer agents. These polymers can then be rapidly photocured into model elastomers with few dangling-end defects and tunable properties …
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Synthesis and Characterization of Multiphase, Highly Branched Polymers
… The oligomeric A2 was comprised of well-defined telechelic tertiary amine endcapped poly(tetramethylene oxide). Reduced mechanical properties were observed for highly branched polymers compared to linear counterparts. Highly branched polyurethanes were synthesized with polyether soft segments …
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Non-Covalent Interactions in Block Copolymers Synthesized via Living Polymerization Techniques
… chemistry of acetoacetate functionalized telechelic oligomers to diacrylate Michael acceptors. The thermomechanical properties of the networks based on poly(propylene glycol) oligomers were analyzed with respect to the molecular weight between crosslink points (Mc) and the critical …
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