Macromolecular Chemistry and Physics

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Structure and Properties of Poly(butyl acrylate‐block‐sulfone‐block‐butyl acrylate) Triblock Copolymers Prepared by ATRP
Macromolecular Chemistry and Physics - Tập 206 Số 1 - Trang 33-42 - 2005
Ying Zhang, Im Sik Chung, Jinyu Huang, Krzysztof Matyjaszewski, Tadeusz Pakuła
AbstractSummary: A series of telechelic OH polysulfones (PSU) were converted to atom transfer radical polymerization (ATRP) macroinitiators by reaction with 2‐bromoisobutyryl bromide. Three macroinitiators with different chain lengths were extended with poly(butyl acrylate) (PBA) to form ABA triblock copolymers. The structure and dynamics of ...... hiện toàn bộ
Fluoroelastomer Copolymers Incorporating Polyhedral Oligomeric Silsesquioxane
Macromolecular Chemistry and Physics - Tập 209 Số 19 - Trang 2040-2048 - 2008
Bradley Seurer, E. Bryan Coughlin
AbstractThe aggregation of polyhedral oligomeric silsesquioxane (POSS) in copolymers was studied by incorporation of POSS into fluorinated copolymers, namely poly(octafluoropentyl acrylate) elastomers. The aggregation of POSS in copolymers affords unique materials. Studies of these novel polymers show POSS aggregates in these copolymers with both the phenyl and iso...... hiện toàn bộ
Polyurethane Networks Modified with Octa(propylglycidyl ether) Polyhedral Oligomeric Silsesquioxane
Macromolecular Chemistry and Physics - Tập 207 Số 20 - Trang 1842-1851 - 2006
Yonghong Liu, Yong Ni, Sixun Zheng
AbstractSummary: OpePOSS was incorporated into polyurethane to make organic‐inorganic hybrid composites and nano‐composites containing up to 20 wt.‐% POSS were prepared. The formation of the hybrid polyurethane networks is ascribed to two principal cross‐linking reactions: i) the cross‐linking reaction between MOCA and the polyurethane prepol...... hiện toàn bộ
Epoxy Resin Containing Octamaleimidophenyl Polyhedral Oligomeric Silsesquioxane
Macromolecular Chemistry and Physics - Tập 206 Số 20 - Trang 2075-2083 - 2005
Yong Ni, Sixun Zheng
AbstractSummary: Octamaleimidophenyl polyhedral oligomeric silsesquioxane (OmipPOSS) was synthesized via the imidization reaction between octaaminophenyl polyhedral oligomeric silsesquioxane (OapPOSS) and maleic anhydride, and it was characterized by means of Fourier transform infrared (FTIR) and NMR spectroscopies. OmipPOSS was further emplo...... hiện toàn bộ
Influence of Type of Initiation on Thiol–Ene “Click” Chemistry
Macromolecular Chemistry and Physics - Tập 211 Số 1 - Trang 103-110 - 2010
Mustafa Uyğun, Mehmet Atilla Taşdelen, Yusuf Yağcı
AbstractThermally and photochemically initiated thiol–ene click reactions using thiol‐ and allyl‐ end functionalized linear polystyrenes with various enes (allyl bromide, methyl acrylate, and methyl methacrylate) and thiol (3‐mercaptopropionic acid) have been investigated. Allyl‐ and thiol‐end‐capped polystyrenes with controlled molecular weight and low polydispers...... hiện toàn bộ
Modification of Natural Rubber by Grafting with Hydrophilic Vinyl Monomers
Macromolecular Chemistry and Physics - Tập 206 Số 24 - Trang 2450-2460 - 2005
Wiyong Kangwansupamonkon, Robert G. Gilbert, Suda Kiatkamjornwong
AbstractSummary: The grafting of two hydrophilic vinyl monomers, dimethylaminoethyl acrylate (DMAEA) and dimethylaminoethyl methacrylate (DMAEMA), onto natural rubber latex was carried out by emulsion polymerization using redox initiation. The effects of the redox initiator concentration and type (cumene hydroperoxide/tetraethylenepentamine, ...... hiện toàn bộ
Mechanism of the Formation of Amorphous Gold Nanoparticles within Spherical Polyelectrolyte Brushes
Macromolecular Chemistry and Physics - Tập 208 Số 14 - Trang 1542-1547 - 2007
Marc Schrinner, Frank Polzer, Yu Mei, Yan Lü, Björn Haupt, Matthias Ballauff, Astrid Göldel, Markus Drechsler, Johannes Preußner, Uwe Glatzel
AbstractWe present a comprehensive investigation on the formation of gold nanoparticles in spherical polyelectrolyte brushes. These colloidal carrier particles consist of a solid polystyrene core onto which long cationic polyelectrolyte chains are grafted. Immersed in water these polyelectrolyte chains can be used to enrich AuCl ions. The metal ions thus confined in the polyelectrolyte layer can be reduced to gold nanoparticles of approximately 1 nm diameter. Cryogenic transmission electron microscopy shows that the Au particles are located near the surface and exhibit a narrow size distribution. Measurements by dynamic light scattering demonstrate that the polyelectrolyte chains are located near the surface of the core particles. This is explained by a crosslinking of the cationic polyelectrolyte chains by the nanoparticles that carry a negative charge. If the Au nanoparticles are removed, the spherical polyelectrolyte brushes re‐expand. High‐resolution electron microscopy together with wide‐angle X‐ray scattering measurements demonstrates that the Au nanoparticles are amorphous. We demonstrate that these Au nanoparticles exhibit catalytic activity for hydrogenation reactions that is slightly below the one of Pt and Pd nanoparticles. hiện toàn bộ
Synthesis and characterization of novel triazeno‐group containing photopolymers
Macromolecular Chemistry and Physics - Tập 196 Số 3 - Trang 739-749 - 1995
Oskar Nuyken, Jürgen Stebani, Thomas Lippert, Alexander Wokaun, Andrej Staško
AbstractThe synthesis of novel triazeno‐group containing photopolymers is described including their characterization by spectroscopic methods, differential scanning calorimetry, and thermogravimetric analysis. Triazene polymers synthesized by a polycondensation reaction between a bisdizaonium salt and a bifunctional secondary amine are well soluble in usual organic...... hiện toàn bộ
Photolysis, thermolysis, and protolytic decomposition of a triazene polymer in solution
Macromolecular Chemistry and Physics - Tập 196 Số 3 - Trang 751-761 - 1995
Oskar Nuyken, Jürgen Stebani, Thomas Lippert, Alexander Wokaun, Andrej Staško
AbstractThe depolymerization of a triazeno‐group containing photopolymer, poly[oxy‐1,4‐phenyleneazo(methylimino)hexamethylene(methylimino)azo‐1,4‐phenylene], is investigated in a tetrahydrofuran (THF) solution. Irradiation of the material leads to a clean decomposition of the photolabile polymer, as monitored by UV spectroscopy and gel‐permeation chromatography (GP...... hiện toàn bộ
Anionic Polymerization of Cyclohexa‐1,3‐diene in Cyclohexane with High Stereoregularity and the Formation of Crystalline Poly(cyclohexa‐1,3‐diene)
Macromolecular Chemistry and Physics - Tập 204 Số 5-6 - Trang 755-761 - 2003
Roderic P. Quirk, Fengxiang You, Lei Zhu, Stephen Z. D. Cheng
AbstractPolymerization of cyclohexa‐1,3‐diene using sec‐BuLi as initiator in cyclohexane produces both soluble (70–90 wt.‐%) and insoluble (10–30 wt.‐%) fractions depending on the temperature. The insoluble poly(cyclohexa‐1,3‐diene) was crystalline as determined by X‐ray diffraction and differential scanning calorimetry analysis (... hiện toàn bộ
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