Download or read book The Synthesis and Characterization of Monodisperse Polydimethylsiloxane poly methyl Methacrylate AB ABA and Star Block Copolymers written by James Peter Mason and published by . This book was released on 1989 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1990 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Faculties Publications and Doctoral Theses in Chemistry and Chemical Engineering at United States Universities written by American Chemical Society. Committee on Professional Training and published by . This book was released on 1991 with total page 1646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Papers Presented at the Meeting written by American Chemical Society. Division of Polymer Chemistry and published by . This book was released on 1989 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstracts of Papers written by American Chemical Society. Meeting and published by . This book was released on 1990 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Properties of the First Macrocyclic Polystyrene polydimethylsiloxane Block Copolymers written by Rui Yin and published by . This book was released on 1993 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Polycarbonate polydimethylsiloxane Block Copolymers written by Judy S. Riffle and published by . This book was released on 1980 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Polymandelide and Lactide methacrylate Block Copolymers written by Tianqi Liu and published by . This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of PDMS based Block Copolymers Toward Sub 10nm Nanopatterning written by Yingdong Luo and published by . This book was released on 2015 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymer self-assembly has been used as nanopatterning towards applications of lithography for decades. For the purpose of smaller, faster and cheaper transistor developments, block copolymers with high Flory-Huggins parameter and better etching contrast need to be further developed. PDMS based block copolymers are of the most interest among all candidates. I synthesized a library of well defined PDMS-b-PMMA, PDMS-b-PS and PDMS-b-PEO through "click" chemistry. The Flory-Huggins interaction parameters of these block copolymers are characterized much higher than conventional block copolymers as expected. Therefore, sub-10 nm domain periods are achieved by these materials in bulk. Significantly, long range ordered nanoline and nanodot patterns have been produced by PDMS-b-PMMA. Furthermore, a small molecule (L)-tartaric acid used as a hydrogen bonding donor was proved to efficiently suppress the crystallinity of PEO and significantly enhance the self-assembly behavior. Finally, the triazole moiety in the middle of the block copolymer which synthesized by "click" chemistry was functionalized to produce an ionic junction block copolymer. The electrostatic interactions before the opposite charges act as an extra enthalpy to help the self-assembly. Therefore, order disorder transition temperature of the block copolymer was dramatically increased.
Download or read book Synthesis and Morphology Characterization of Polydimethylsiloxane containing Block Copolymers written by Maurice Wadley and published by . This book was released on 2011 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thin film morphology characteristics of polydimethylsiloxane-containing block copolymers have been investigated. For this investigation, a commercially available hydroxyl terminated PDMS was purchased from Gelest and attached to a carboxylic acid functional reversible addition-fragmentation chain transfer (RAFT) agent by Steglich esterification. This produced macro-RAFT agents to which styrene monomer was polymerized. By using this approach the generation of low polydispersity polystyrene-block-polydimethylsiloxane (PS-block-PDMS) copolymers of various molecular weights spanning a wide volume fraction range in which the PDMS block remained the same in each polymerization. Synthesized block copolymers were characterized by gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy. Bulk and thin film characterization of PS-block-PDMS copolymers was done by small-angle x-ray scattering (SAXS), transmission electron microscopy (TEM), contact angle measurements, scanning force microscopy (SFM), and grazing incidence small-angle X-ray scattering (GISAXS). The following observations have been made. For PS-rich PS-block-PDMS copolymer thin films the low surface tension of PDMS caused it to migrate to the film surface regardless of solvent choice. The surface morphology was found to depend strongly on the solubility parameter of the solvent and exhibited SFM images consistent with parallel cylinder, perforated lamellar, and lamellar surface layers with increasing solvent solubility parameter. This behavior was due to the selective swelling of the individual blocks under slightly selective, good solvent conditions. A custom solvent annealing apparatus provided similar results in which order-order transitions in the thin films were observed with increasing solvent solubility parameter. Additionally improvements in the long-range order were observed after 1 h of solvent annealing. PS-rich PS-block-PDMS copolymer thin films also displayed PDMS rich surfaces after casting. Etching of this wetting layer by exposure to ultraviolet/ozone (UVO) cleaner allowed characterization of the interior film morphology. GISAXS was also able to characterize domain orientation in the as-cast and selectively etched thin films. PDMS cylinder orientation in PS-block-PDMS copolymer was found to be dependent on solvent choice and polymer molecular weight. The likely mechanism for perpendicularly oriented PDMS cylinders in selective solvents was an order-order transition to spheres where cylinders would nucleate at the air/film surface and template a perpendicularly oriented morphology during evaporation induced ordering. Perpendicularly oriented PDMS cylinders were observed in the lower molecular weight PS-rich PS-block-PDMS thin film samples indicating a preferential molecular weight range for the formation of perpendicular domains. Solvent annealing in PS selective chlorobenzene improved the long range order, but was not a strong driving force in altering domain orientation.
Download or read book Synthesis and Characterization of Block Copolymers of Polyvinylpyridine PVP Or Polyalphamethylstyrene PAMS with Polydimethylsiloxane PDMS and Self Assembly of PVP PDMS and Polyvinylphenol written by James A. Lee and published by . This book was released on 2000 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Block Copolymers of Methyl Siloxane Phenyl Siloxane Vinyl Siloxane Etc written by John Akolisa Ibemesi and published by . This book was released on 1979 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesis of homo poly(dimethylsiloxane) PDMS, homo poly(diphenylsiloxane PDPS, and di- and tri- block copolymers of PDMS and PDPS have been carried out by anionic living polymerization, using the following reagents: hexamethylcyclotrisiloxane, HMTS and hexaphenylcyclotrisiloxane, HPTS (monomers), n-BuLi and dilithium diphenyldisilanolate, DLS (initiators), DMSO and THF (promoters) and Toluene (solvent). Lithium based catalysts are used in order to minimize siloxane rearrangement (equilibration) reactions.
Download or read book Synthesis and Characterisation of Novel Copolymers and Latexes Via ATRP written by Shaun Antony Furlong and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Styrene methyl Methacrylate Block Copolymers written by Tracy L. Morris and published by . This book was released on 1983 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Poly methyl Methacrylate Particles Sterically Stabilized by Polyisobutylene written by Brett Jon Williamson and published by . This book was released on 1985 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Stereoblock Polymers of Poly methyl Methacrylate written by Martin A. Doherty and published by . This book was released on 1984 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
