Search results for: David Y. Son

Items from 1 to 20 out of 27 results

article

Synthesis and characterization of phenylated phenylenediamine and bisphenol a diglycidyl ether epoxy networks

Stephen M. Budy, Anderson Wey, Angelina Wu, David Y. Son

Journal of Applied Polymer Science > 139 > 11 > n/a - n/a

A new highly aromatic hardener, phenylated phenylenediamine (PDA), was synthesized utilizing a Diels‐Alder reaction to afford a mixture of para and meta conformations. This new hardener was cured with bisphenol A diglycidyl ether (BADGE). To investigate the conformational mixture, pure 1,4‐benzenediamine and 1,3‐benzenediamine were cured with BADGE. DSC was employed to observe cure curves affording...

article

Synthesis, characterization and nanoparticle formation of polyarylene poly(amic acid)s and polyimides containing fluorescent dye moieties

Stephen M Budy, Joseph Rose, Corinne Gibson, David Y Son

Polymer International > 70 > 6 > 759 - 767

New naphthalene‐ and perylene‐containing polyarylene poly(amic acid)s and polyimides were synthesized from a new phenylated phenylenediamine. A small‐molecule model compound was also synthesized with naphthalene end‐groups. The new compounds were characterized, and the structures were confirmed using ¹H NMR and attenuated total reflectance Fourier transform infrared spectroscopy. Thermal characterization...

article

Synthesis and Properties of Polymers with an Organosilicon–Acetylene Backbone

Stephen M. Budy, David Y. Son

Journal of Inorganic and Organometallic Polymers and Materials > 2018 > 28 > 5 > 1673-1687

Acetylene- and diacetylene-containing organosilicon polymers continue to be of great interest in academia, government, and industry due to their high thermo-oxidative stability combined with excellent solubility and processability characteristics. Progress in this field over the past 30 years is reported herein. We present and discuss the synthesis, characterization, and structure–property relationships...

article

Degradable epoxy resins based on bisphenol A diglycidyl ether and silyl ether amine curing agents

Zahra S. Bassampour, Stephen M. Budy, David Y. Son

Journal of Applied Polymer Science > 134 > 12 > n/a - n/a

A series of silyl ether amine curing agents were synthesized by selective substitution reactions of chloroalkylsilanes or the transetherification of alkoxysilanes. Crosslinked networks were prepared by mixing a stoichiometric ratio of bisphenol A diglycidyl ether (D.E.R 331) with the amine curing agents. The networks were characterized by ATR‐FTIR spectroscopy, TGA, DSC, and DMA. The onset of thermal...

chapter

Polycarbosilazane and Related Dendrimers and Hyperbranched Polymers

David Y. Son

Advances In Silicon Science > Silicon-Containing Dendritic Polymers > 97-103

Linear polysilazanes and polycarbosilazanes are well-known members of the organosilicon polymer family and can be prepared by a variety of methods [1, 2]. These polymers are characterized by having either a –Si–N– backbone (polysilazanes) or a –R–Si–N– backbone (polycarbosilazanes). On the other hand, dendritic analogs are relatively rare. Polysilazane dendrimers are essentially nonexistent, and the...

chapter

Cyclization Issues in Silicon-Containing Hyperbranched Polymers

David Y. Son

Advances In Silicon Science > Silicon-Containing Dendritic Polymers > 391-400

Theoretical descriptions of AB_n (n ≥ 2) hyperbranched polymerization systems have been known for some time [1], but in them, cyclization is a factor that is generally and largely ignored. However, it is now understood that cyclization is prevalent in polymerizations of this type, and that it can often affect to a significant extent both polydispersity and molecular weights of the polymer products...

article

Synthesis and anion recognition of three new preorganized colorimetric urea/thiourea compounds and their corresponding reference receptors

Abby R. Jennings, David Y. Son

Tetrahedron > 2015 > 71 > 23 > 3990-3999

Three new thiourea/urea preorganized tripodal anion receptors were synthesized in high yield utilizing the thiol-Michael reaction as a key synthetic step. The binding affinity and selectivity of the various receptors towards chloride, fluoride, acetate, and dihydrogen phosphate were evaluated through UV–vis and ¹H NMR spectroscopic titrations. In addition, four new thiourea/urea reference receptors...

article

Orthogonal reactivity of thiols toward chlorovinylsilanes: selective thiol-ene chemistry

Abby R. Jennings, Zahra S. Bassampour, Anish G. Patel, David Y. Son

Tetrahedron Letters > 2014 > 55 > 50 > 6773-6775

A variety of new chlorosilanes were synthesized by the selective thiol-ene reactions of various thiols (ethanethiol, 1,2-ethanedithiol, benzenethiol, and tetrakis(2-sulfanylethyl)silicate) with chlorovinylsilanes (chlorodimethylvinylsilane, dichloromethylvinylsilane, and trichlorovinylsilane). No silylthioester products were observed. All products were obtained in quantitative or near quantitative...

article

Efficient synthesis and anion recognition of a colorimetric preorganized tripodal thiourea compound

Abby R. Jennings, David Y. Son

Tetrahedron Letters > 2012 > 53 > 17 > 2181-2184

A preorganized colorimetric tripodal thiourea receptor was synthesized in high yield utilizing a thiol-ene reaction as a primary step. The interaction of the receptor with dihydrogen phosphate, acetate, chloride, and fluoride anions was investigated using UV–vis. and ¹ H NMR spectroscopic titration techniques. The binding stoichiometry of the receptor with dihydrogen phosphate and acetate...

article

Nafion-sulfonated dendrimer composite membranes for fuel cell applications

Anjalee D. Liyanage, John P. Ferraris, Inga H. Musselman, Duck-Joo Yang, more

Journal of Membrane Science > 2012 > 392-393 > Complete > 175-180

Novel proton conducting composite membranes were synthesized by blending Nafion ^® polymer with sulfonated organosilicon dendrimers (G3-S). Blending G3-S with Nafion resulted in stable, flexible membranes with loadings up to 10% by weight. The high amount of sulfonic acid groups on the dendrimer increased the ion exchange capacity and improved the water retention capability of the composite...

article

A Synthetic Approach to Oligomeric Phenylethynylsilylenes

Christiana Rissing, Marcelo Rains, David Y. Son

Journal of Inorganic and Organometallic Polymers and Materials > 2010 > 20 > 4 > 616-621

Oligomers consisting of alternating phenylethynyl and monosilyl or disilanyl moieties were synthesized in 15–64% precipitated yields by the reactions of dilithiated ethynylbenzene with dichlorodimethylsilane, dichlorodiphenylsilane, and 1,2-dichloro-1,1,2,2-tetramethyldisilane. Degrees of polymerization were fairly low due to chain termination reactions involving the deprotonation of ethynyl groups...

article

Facile and efficient synthesis of star-shaped oligomers from a triazine core

Chinwon Rim, David Y. Son

Tetrahedron Letters > 2009 > 50 > 28 > 4161-4163

A facile and efficient synthetic approach to tripodal star-shaped oligomers is described. Several generations of hydroxyl-terminated tripodal star-shaped oligomers were prepared in high yield from 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAT) as a core by alternating amine-catalyzed thiol-ene and acrylate esterification reactions. The compounds were fully characterized by 1D and 2D NMR spectroscopy,...

article

Application of Thiol−Ene Chemistry to the Preparation of Carbosilane−Thioether Dendrimers

Christiana Rissing, David Y. Son

Organometallics > 2009 > 28 > 11 > 3167 - 3172

article

Thiol-ene reactions of 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAT): facile access to functional tripodal thioethers

Chinwon Rim, Lauren J. Lahey, Vijita G. Patel, Hongming Zhang, more

Tetrahedron Letters > 2009 > 50 > 7 > 745-747

Efficient syntheses of tripodal thioethers have been achieved by ionic thiol-ene reactions of 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAT) with a variety of commercially available thiols. The reactions are complete within minutes and give the products in high yields (63−96%) and high purity without a complex workup. The thiol-ene reactions tolerate a wide range of functionality, including hydroxy,...

article

Silyl-Substituted Thioether Ligands and Their Ag(I) Complexes

Chinwon Rim, Hongming Zhang, David Y. Son

Inorganic Chemistry > 2008 > 47 > 24 > 11993 - 12003

article

Thiol−Ene Reaction for the Synthesis of Multifunctional Branched Organosilanes

Christiana Rissing, David Y. Son

Organometallics > 2008 > 27 > 20 > 5394 - 5397

article

Synthesis and characterization of a versatile bis(pyridylether) ligand and its complexes with Ag(I), Cu(II) and Co(II)

Christiana Siaw-Lattey, Hongming Zhang, David Y. Son

Polyhedron > 2005 > 24 > 7 > 785-790

A new bis(pyridylether) ligand L was synthesized in 46% yield from the reaction of two equivalents of 2-pyridylethanol with α,α′-dibromo-o-xylene in the presence of sodium hydroxide. Ligand L possesses structural features that allow it to react either intermolecularly or in a chelating fashion with transition metal ions. With AgNO ₃ , ligand L forms a helical metallopolymer. Ligand L, in combination...

article

Synthetic Approaches to Cyclodisilazanes and Branched Silazanes

Yingxin Xiao, David Y. Son

Organometallics > 2004 > 23 > 19 > 4438 - 4443

article

Helical metallopolymers from the coordination of new bis(pyridyl)terephthalate ligands with silver(I)

Mananjali K. Kalra, Hongming Zhang, David Y. Son

Inorganic Chemistry Communications > 2004 > 7 > 9 > 1019-1022

Two new bis(pyridyl)terephthalate ligands were synthesized in good yields from the reaction of either 2-pyridylcarbinol or 2-pyridinepropanol with terephthaloyl chloride in the presence of triethylamine. Mixing these ligands with silver(I) salts resulted in the formation of crystalline helical polymeric complexes. In the complexation involving silver triflate, two separate structures were obtained,...

article

Spacer Flexibility in Bis(pyridyl) Ligands: Chelating Organosilicon Pyridylethynyl Ligands

Parbati Sengupta, Hongming Zhang, David Y. Son

Inorganic Chemistry > 2004 > 43 > 6 > 1828 - 1830

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INFONA - science communication portal

Search results for: David Y. Son

Synthesis and characterization of phenylated phenylenediamine and bisphenol a diglycidyl ether epoxy networks

Synthesis, characterization and nanoparticle formation of polyarylene poly(amic acid)s and polyimides containing fluorescent dye moieties

Synthesis and Properties of Polymers with an Organosilicon–Acetylene Backbone

Degradable epoxy resins based on bisphenol A diglycidyl ether and silyl ether amine curing agents

Polycarbosilazane and Related Dendrimers and Hyperbranched Polymers

Cyclization Issues in Silicon-Containing Hyperbranched Polymers

Synthesis and anion recognition of three new preorganized colorimetric urea/thiourea compounds and their corresponding reference receptors

Orthogonal reactivity of thiols toward chlorovinylsilanes: selective thiol-ene chemistry

Efficient synthesis and anion recognition of a colorimetric preorganized tripodal thiourea compound

Nafion-sulfonated dendrimer composite membranes for fuel cell applications

A Synthetic Approach to Oligomeric Phenylethynylsilylenes

Facile and efficient synthesis of star-shaped oligomers from a triazine core

Application of Thiol−Ene Chemistry to the Preparation of Carbosilane−Thioether Dendrimers

Thiol-ene reactions of 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAT): facile access to functional tripodal thioethers

Silyl-Substituted Thioether Ligands and Their Ag(I) Complexes

Thiol−Ene Reaction for the Synthesis of Multifunctional Branched Organosilanes

Synthesis and characterization of a versatile bis(pyridylether) ligand and its complexes with Ag(I), Cu(II) and Co(II)

Synthetic Approaches to Cyclodisilazanes and Branched Silazanes

Helical metallopolymers from the coordination of new bis(pyridyl)terephthalate ligands with silver(I)

Spacer Flexibility in Bis(pyridyl) Ligands: Chelating Organosilicon Pyridylethynyl Ligands

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