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246 Newest Publications about the topic propylene oxide
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Click‐ligation of coumarin to polyether polyols for polyurethane foams
06-11-2012 | Maria M Velencoso, Agustin SB Gonzalez, Joaquin C García‐Martínez, Maria J Ramos, Antonio De Lucas, Juan F Rodriguez, Polymer International, 2012
Abstract A simple strategy for the synthesis and functionalization of polyurethanes is described. Anionic ring‐opening polymerization was combined with ‘click’ chemistry to synthesize polyols with fluorescent properties. This route allows the incorporation of a wide range of ...
CO2/ethylene oxide copolymerization and ligand variation for a highly active salen–cobalt(III) complex tethering 4 quaternary ammonium salts
06-11-2012 | Jong Yeob Jeon; Jung Jae Lee; Jobi Kodiyan Varghese; Sung Jae Na; S. Sujith; Min Jeong Go; Junseong Lee; Myung-Ahn O ..., Dalton Transactions, 2012
A cobalt(iii) complex (1) of a salcy-type ligand tethering 4 quaternary ammonium salts, which is thought to act as a highly active catalyst for CO2/propylene oxide (PO) copolymerization, also shows high activity (TOF, 25 [ ] 900 h−1; TON, 518 [ ] 000; 2.72 kg polymer per g cat) and selectivity (
Fast sol-gel synthesis of mesoporous Li2MnSiO4/C nanocomposite with improved electrochemical performance for lithium-ion batteries
05-11-2012 | Fuqing Wang, Jian Chen, Chong Wang, Baolian Yi, Journal of Electroanalytical Chemistry, 2012
A fast sol-gel process that differs in important details from previously reported methods for preparing Li2MnSiO4/C nanocomposite was reported. In the process, hydrochloric acid was used to enhance the hydrolysis of tetraethyl orthosilicate (TEOS) to obtain silanols firstly. And then ...
Self-Assembled Block Copolymer–Nanoparticle Hybrids: Interplay between Enthalpy and Entropy
01-11-2012 | Biswajit Sarkar; Paschalis Alexandridis, Langmuir, 2012
The dispersion of nanoparticles in ordered block copolymer nanostructures can provide control over particle location and orientation, and pave the way for engineered nanomaterials that have enhanced mechanical, electrical, or optical properties. Fundamental questions pertaining to the role of ...
Poly(propylene carbonate): Insight into the Microstructure and Enantioselective Ring-Opening Mechanism
31-10-2012 | Khalifah A. Salmeia; Sergei Vagin; Carly E. Anderson; Bernhard Rieger, Macromolecules, 2012
Different poly(propylene carbonate) (PPC) microstructures have been synthesized from the alternating copolymerization of CO2 with both racemic propylene oxide (PO) and various mixtures of PO enantiomers using chiral salen catalysts. The microstructures of the obtained copolymers as a function ...
Influence of the Metal (Al, Cr, and Co) and the Substituents of the Porphyrin in Controlling the Reactions Involved in the Copolymerization of Propylene Oxide and Carbon Dioxide by Porphyrin Metal(III) Complexes. 2. Chromium Chemistry
24-10-2012 | Chandrani Chatterjee; Malcolm H. Chisholm, Inorganic Chemistry, 2012
The reactivities of chromium(III) complexes LCrX, where L = 5,10,15,20-tetraphenylporphyrin (TPP), 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (TFPP), and 2,3,7,8,12,13,17,18-octaethylporphyrin (OEP) and X = Cl or OH, have been studied with respect to their ability to homopolymerize ...
General Information to Obtain Spherical Particles with Ordered Mesoporous Structures
20-10-2012 | Tatsuo Kimura, Yusuke Yamauchi, Chemistry - An Asian Journal, 2012
Abstract Conditions for the synthesis of aluminum organophosphonate (AOP) and aluminophosphate (AlPO) spheres containing periodic mesopores were optimized and demonstrated to be general morphological controls for the surfactant‐assisted synthesis of mesoporous materials. High‐quality AOP ...
Enantiospecific Desorption of R- and S-Propylene Oxide from d- or l-Lysine Modified Cu(100) Surfaces
17-10-2012 | Wai Yeng Cheong; Andrew J. Gellman, Langmuir, 2012
The enantiospecific desorption kinetics of R- and S-propylene oxide (PO) from a Cu(100) surface modified by enantiomerically pure d- or l-lysine have been studied using temperature programmed desorption. These experiments have used R- or S-PO as the chiral probe for study of enantiospecific ...
Dicarboxylic acid promoted immortal copolymerization for controllable synthesis of low‐molecular weight oligo(carbonate‐ether) diols with tunable carbonate unit content
26-09-2012 | Yonggang Gao, Lin Gu, Yusheng Qin, Xianhong Wang, Fosong Wang, Journal of Polymer Science Part A: Polymer Chemistry, 2012
Abstract Low‐molecular weight oligo(carbonate‐ether) diols are important raw materials for polyurethane formation, which with tunable carbonate unit content (CU) may endow new thermal and mechanical performances to polyurethane. Herein, facile synthesis of oligo(carbonate‐ether) diols ...
Low-Cost Polymer-Supported Quaternary Ammonium Salts as High-Efficiency Catalysts for Cycloaddition of CO2 to Epoxides
26-09-2012 | Yuan-Yuan Zhang, Lang Chen, Shuang-Feng Yin, Sheng-Lian Luo, Chak-Tong Au, Catalysis Letters, 2012
Abstract Polystyrene grafted with quaternary ammonium salts were obtained by direct quaternarization of chloromethylated polystyrene with N,N-dimethylethylamine, N,N-dimethylglycine (denoted as PS-QNS and PS-CQNS, respectively). These two polymer-supported ionic liquids were found to show ...
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