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Showing 1 to 20 of 20 for “"Macroinitiator"”.
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Branched Glycopolymers
… using a silsesquioxane nanoparticles-based macroinitiator of ca. 58 initiator functions and MAIGlc as monomer via ATRP using the “core first” approach. Well-defined glycostars could be synthesized by restricting the polymerization to low conversion. The molecular weights of the star polymers …
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Synthesis, characterization and properties of epoxide containing block and alternating copolymers
… have been synthesized with poly(ethylene oxide) macroinitiators ranging from O.75K-40K. Monohydroxy functionalized PEO oligomers have been synthesized with potassium tert-butoxide as an initiator in tetrahydrofuran, and in the bulk. The PEO oligomers were reacted with 4-(chloromethyl) benzoyl …
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Preparation of Nitrile Containing Siloxane Triblock COpolymers and Their APplication As Stabilizers For Siloxane Magnetic Fluids
… initiated by lithium silanolate endcapped PCPMS macroinitiators. The macroinitiators were prepared by equilibrating mixtures of 3- cyanopropylmethylcyclosiloxanes (DxCN) and dilithium diphenylsilanediolate (DLDPS). DxCNs were synthesized by hydrolysis of 3-cyanopropylmethyldichlorosilane, …
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New block copolymers of Isobutylene by combination of cationic and anionic polymerizations
… was synthesized using hydroxyl end-capped PIB as macroinitiator in conjunction with tBu-P4. The aggregation behavior in dilute aqueous solutions of a PIB-b-PEO copolymer, produced from the combination of cationic and anionic polymerizations, was investigated by dynamic light scattering in aqueous …
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Synthesis and characterization of stimuli-responsive microgels based on poly(glycidol)block copolymers
… ATRP polymerization Cl-terminated poly(glycidol) macroinitiators were prepared by modification of (Omega)-hydroxyl group of poly(glycidol acetal) using 2-chloropropionyl chloride fallowed by selective acidic deprotection of acetal groups. The obtained macroinitiators of different molar masses were …
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Poly(2-alkyl-2-oxazoline) containing multiphase systems
… containing copolymers were prepared using macroinitiator methods, with poly(2-alkyl-2-oxazoline) being either the macroinitiator or the second component synthesized. Narrow distribution poly(dimethylsiloxane) oligomers terminated with benzyl chloride endgroups were prepared by living …
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Synthesis and characterization of polymacromonomers based on polyethers
… The ATRP carried out in water using PEO macroinitiator led to polymacromonomers with polydispersity indices from 1,1 to 1,3 and desiried molecular weight. In all cases the conversion of macromonomer (able to polymerization) was close to 100%. The polymerization product could easily be …
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Synthesis and Characterization of Polylactide-siloxane Block Copolymers as Magnetite Nanoparticle Dispersion Stabilizers
… reactions. These oligomers were utilized as macroinitiators for ring-opening L-lactide to provide triblock materials with polymethylvinylsiloxane central blocks and poly(L-lactide) endblocks. The molecular weights of the poly(L-lactide) endblocks were controlled by the mass of L-lactide …
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Synthesis, characterization and kinetic investigations of heterophase materials prepared using group transfer polymerization
… functional group on the PDMS provided a suitable macroinitiator for the GTP of methyl methacrylate, which leads to siloxane-b-methacrylate copolymers via a novel route.
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CONTROLLED SYNTHESIS OF TOPOLOGICALLY TEMPLATED CATENANE AND KNOTTY POLYMER
… four-armed type homopolymer template was used as macroinitiator to polymerize another monomer by ATRP. The resulting block copolymer template was subjected to template-closing via slightly modified ATRC method. Chapter 4 demonstrates another novel approach to synthesize polymer catenanes by first …
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The synthesis of biodegradable polymers using aluminium alkoxide initiators
… with an aluminium alkyl to form a di-alkoxide macroinitiator which was subsequently used as an initiator for the polymerisation of ε-caprolactone to form an ABA type tri-block co-polymer. The molecular weight and other properties were predictable from the initial monomer/initiator ratios.
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Block and Graft Copolymers Containing Carboxylate or Phosphonate Anions
… Modification on one of these afforded a PEO macroinitiator with a bromide on one end and a protected amine on the other end. ATRP polymerization of tert-butyl acrylate (tBuA) in the presence of this initiator and a copper (I) bromide (CuBr) catalyst yielded a diblock copolymer. The copolymer …
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Enabling Synthesis Toward the Production of Biocompatible Magnetic Nanoparticles With Tailored Surface Properties
… The PPO was then utilized as a macroinitiator to polymerize ethylene oxide (EO) with base catalysis. Heterobifunctional PEO and PEO-b-PPO block copolymers possessing carboxylic acid functional groups on one end were synthesized by reacting the vinyl groups with mercaptoacetic …
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Design, Synthesis and Self-Assembly of Polymeric Building Blocks and Novel Ionic Liquids, Ionic Liquid-Based Polymers and Their Properties
… was synthesized from a pseudorotaxane macroinitiator derived from a complex of a crown-centered polystyrene and a dufunctional paraquat compound. A single peak with higher molecular weight from size exclusion chromatography proved the copolymer formation. Supramolecular interactions …
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Hybrids Based on Layered Silicates
… was organophilized with a specifically designed macroinitiator created by statistical Reversible Addition Fragmentation Chain Transfer (RAFT) copolymerization of DMAEMA and the initator-monomer 2-(2-bromoisobutyryloxy)ethyl methacrylate (BIEM). The copolymer was firmly anchored through multiple …
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Self assembled transmembrane protein polymer conjugates for the generation of nano thin membranes and micro compartments
… two steps – a) FhuA was first converted into a macroinitiator by covalently linking a water soluble functional CRP initiator to the lysine residues. b) Copper mediated CRP was then carried out in pure buffer conditions with and without sacrificial initiator to generate the conjugates. The …
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Synthesis and Characterization of Poly(2-Ethyl-2-Oxazoline) Functional Prepolymers and Block Copolymers
… block copolymers were prepared using the macroinitiator method. First, amphiphilic triblock copolymers with hydrophobic poly(arylene ether sulfone) (PSF) central block and hydrophilic PEtOx side blocks were synthesized via polymerization of EtOx sequences from tosylate functional …
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Donor-Acceptor Block Copolymers for Charge Separation at Nanostructured Interfaces
… with 4-vinyltriphenylamine, different PvTPA 23 macroinitiators were synthesized. A series of block copolymers 24C-24F were prepared using the same PvTPA macroinitiator 23C, thus only varying the perylene bisimide block. Furthermore, a series of block copolymers 24A-24C were synthesized using …
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Chain-Growth Polymerization of 3-Hexylthiophene Towards Well-Defined Semiconductor Block Copolymers
… approach to create high molecular weight P3HT macroinitiators for nitroxide mediated radical polymerization. First, the synthesis of alkyne functionalized P3HT was optimized. HCl as a quenching reagent caused hydrohalogenation and hydration reactions and MeOH proved to be the quenching reagent …
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Nanotherapies for Treating Prostate Cancer
… of LA, CB and MAC using mPEG as an macroinitiator and 1,8- diazabicycloundec-7-ene (DBU) as a catalyst. These amphiphilic copolymers which exhibited low polydispersity (1.08) and CMC values (0.8-1 mg/L) were used to prepare micelles with or without drug and stabilized by crosslinking …