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Showing 1 to 20 of 109 for “"Homopolymers"”.
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Structure-property behavior of polyimide homopolymers, copolymers, and blends
Fully imidized, high molecular weight polyimide homopolymers and random segmented poly(siloxane imide) and poly(aryl ether imide) copolymers were prepared for use as environmentally stable, tough structural matrix resins, structural adhesives, and dielectric materials. Although polyimides are well …
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Synthesis and characterization of high performance polyimide homopolymers and copolymers
… method to make fully cyclized polyimide homopolymers and polyimide siloxane copolymers. Polyimide oligomers endcapped with 2-aminopyrimidine were reacted with aminopropyl terminated poly(dimethyl siloxane) to give perfectly alternating segmented polyimide siloxane copolymers. The …
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Interfaces and Fluctuations in Diblock Copolymer Melts and Ternary Mixtures with Homopolymers
… in ternary mixtures of AB diblock copolymers, A homopolymers and B homopolymers which are high molecular counterparts of oil-water-surfactant mixtures. We show that the sign of the spontaneous curvature of an asym- metric diblock copolymer monolayer in these ternary mixtures is controlled by …
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Synthesis and Characterization of Well-Defined Poly(1,3-Cyclohexadiene) Homopolymers and Copolymers
… high molecular weight poly(1,3-cyclohexadiene) homopolymers (<Mn> = 50000) with narrow molecular weight distributions (<Mw>/<Mn> = 1.20). In contrast, the use of a conventional anionic initiation approach resulted in polymerizations that lacked significant degrees of livingness, which limited …
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Kinetics of Double Helix Formation With Homopolymers: Thermodynamic and Kinetic Studies of Dna-Ligand Interactions and Modified Dna
Made available in DSpace on 2014-12-10T23:01:36Z (GMT). No. of bitstreams: 1 7317585.pdf: 3628004 bytes, checksum: 84711905da6341d8329e58ba7d2e3308 (MD5) Previous issue date: 1973
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Synthesis and characterization of poly (butyl vinyl ether) homopolymers and copolymers utilizing the aluminum hydrogen sulfate catalyst system
… vinyl ether-2-chloroethyl vinyl ether) homopolymers and copolymers indicate fairly narrow polydispersities, and very high molecular weights. A study of this copolymerization by lH NMR revealed that the 2-chloroethyl ether monomer was being incorporated along the chain with the greater …
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Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers
Size exclusion chromatography is the method of choice for characterizing molecular weights and molecular weight distributions of polymers. An important advancement in SEC is multidetection SEC which includes multi-angle laser light scattering, viscometry, refractive index and UV spectroscopy to …
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The Physical and Spectroscopic Study of a Series of Poly(3-hexyl thiophene) Homopolymers and Poly(3-hexyl thiophene)-block-Poly(2-hydroxyethyl methacrylate) Diblock Copolymers
In block-selective solvent, the rod-coil block copolymers can form various micellar structures. With block copolymers that contain a conjugated polymer block, the conformation of the conjugated polymer can be reflected by spectral changes in the solution. Therefore, it is of interest to study the …
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Novel functionalised biodegradable polymeric micro- and nano-structures for tissue engineering and drug delivery applications
… glycol)methacrylate)) (POEGMA) homopolymers were prepared using RAFT polymerisation. Two of the POEGMA homopolymers were prepared using two different functional groups, disulphide and n-hydroxysuccinimide (NHS), to allow subsequent cell-adhesive arginine-glycine-aspartic …
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Block copolymer characterization by gel permeation chromatography
… powerful tool for the rapid characterization of homopolymers. The proposed method is introduced by considering a dual-approach: composition distribution (calibration of detectors with composition) and molecular weight distribution (calibration of columns with composition). The absence of …
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Determining the role of charges in ionic polymer blend systems
… at different compositions and compared to the homopolymers via differential scanning calorimetry (DSC), polarized optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but …
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Synthesis and controlled radical polymerization of multifunctional monomers
… methacryl derivatives to achieve well-defined homopolymers, although it was successful for control of polymerization of styrene and block copolymerization of multifunctional acryl- and methacryl derivatives with alkoxyamine terminated polystyrene. The ATRP of multifunctional acrylates and …
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Synthesis of Functionalized Sustainable Polyesters via Controlled Ring-opening Polymerization of O-carboxyanhydrides
… synthetic strategy is not limited to preparing homopolymers and block copolymers but also to producing stereoblock and gradient copolymers (Chapter 4). In particular, the gradient copolymers exhibited better ductility and toughness than their corresponding homopolymers and block copolymers, …
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Synthesis and Characterization of Surface-Functionalized Magnetic Polylactide Nanospheres
Polylactide homopolymers with pendent carboxylic acid functional groups have been designed and synthesized to be studied as magnetite nanoparticle dispersion stabilizers. Magnetic nanoparticles are of interest for a variety of biomedical applications including magnetic field-directed drug delivery …
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Imidazole-Containing Polymerized Ionic Liquids for Emerging Applications: From Gene Delivery to Thermoplastic Elastomers
… polyelectrolytes. Hydroxyl-containing homopolymers exhibited higher thermal stabilities and lower T<sub>g</sub>'s compared to the respective alkyl-analog. X-ray scattering demonstrated the polarity of the hydroxyl group facilitated solvation of the electrostatic interactions disrupting …
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Cyclopropene polymerization and enyne metathesis catalyzed by high oxidation state molybdenum alkylidenes
… (DCMNBD),and afford homopolymers of DCMNBD and methyltetracyclododecene (MTD) in a living fashion. MALDI-TOF mass spectra of ferrocene-containing homopolymers have been obtained that are consistent with the polymerization process being living.
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Novel Carbazole Based Methacrylates, Acrylates, and Dimethacrylates to Produce High Refractive Index Polymers
Homopolymers and copolymers produced from aromatic based methacrylates, acrylates, and dimethacrylates are excellent materials with many applications in dentistry, microelectronics, and optics, including optical eye wear, fiber optics, and non-linear optics, such as holography. Carbazole based …
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Dendronized Amphiphilic Copolymers Synthesized from Methacrylate Derivatives as Potential Topical Microbicides
… weight (<10,000 g/mol) polymers. Dendronized homopolymers were prepared from MIII with varying MMP concentrations (0–10 mol%). MALDI-TOF MS characterized the homopolymer prepared with 10 mol% MMP (Mn = 2,481 g/mol). In the presence of MMP, MIII (5 to 25 mol%) was copolymerized with alkyl …
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Design of Heterogeneous Surfaces for Polymer Adsorption
… chemically homogeneous surface, unlike flexible homopolymers, the adsorption kinetics of protein were strongly affected by the chemical properties of surfaces. The adsorption behavior on chemically heterogeneous surfaces was investigated in the case where the heterogeneity was on a molecular …
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