Synthesis Of Various Poly Research Articles

Synthesis of Various Poly(2-hydroxyethyl vinyl ether)-Stabilized Latex Particles via Surfactant-Free Emulsion Polymerization in Water

Following the recent success of the controlled radical polymerization of hydroxy-functional vinyl ethers [Macromolecules 2016, 49, 1563; 2017, 50, 8346], we report a surfactant-free, batch emulsion polymerization stabilized by the poly(hydroxy-functional vinyl ether)s. A series of emulsion polymerizations of various hydrophobic monomers such as vinyl acetate (VAc), methyl methacrylate (MMA), ethyl acrylate (EA), and styrene (St) were performed using poly(2-hydroxyethyl vinyl ether) (PHEVE) with hydrophilic azoinitiator, 2,2′-azobis(2-amidinopropane) dihydrochloride. In the emulsion polymerization in water using PHEVE as a steric stabilizer, the polymerization proceeded smoothly to form PHEVE-stabilized spherical particles without any coagulation. The mean particle diameter could be controlled over a size range (261 nm–ca. 1 μm) with relatively narrow size distributions by varying the synthesis parameters. Furthermore, one-pot emulsion polymerization was also conducted from HEVE to poly(vinyl acetate) (PVA...

Cationic Polymerization of Vinyl Ethers Controlled by Visible Light.

Photoinitiated cationic polymerizations are widely used in industrial processes; however, gaining photocontrol over chain growth would expand the utility of these methods and facilitate the design of novel complex architectures. We report herein a cationic polymerization regulated by visible light. This polymerization proceeds under mild conditions: a combination of a metal-free photocatalyst, a chain-transfer agent, and light irradiation enables the synthesis of various poly(vinyl ether)s with good control over molecular weight and dispersity as well as excellent chain-end fidelity. Significantly, photoreversible cation formation in this system enables efficient control over polymer chain growth with light.

Preparation of a Library of Poly(N-sulfonylimidates) by Cu-Catalyzed Multicomponent Polymerization

Efficient synthesis of polyimidates has been a great challenge because of the difficulty of imidate bond formation and limited substrate scope. Here, we describe a successful method for the synthesis of various poly(N-sulfonylimidates) using Cu-catalyzed multicomponent polymerization (MCP). Minimizing water contamination in the polymerization, which results in low-molecular-weight oligomers, allows various combinations of three types of monomers (diynes, sulfonyl azides, and diols) that are bench stable and readily accessible, providing access to a library of polyimidates. Moreover, the formation of polyimidates is highly selective over the conventional click reactions. Most importantly, this report demonstrates a successful MCP that overcomes the drawbacks of previous MCP methods showing narrow monomer scope and producing low-molecular-weight polymers.

Electroluminescence devices made with poly(alkylthiophenes)

In our previous papers, we reported the synthesis of various poly(3-alkylthiophenes) derivatives with different side chain length, fabrication of their Langmuir-Blodgett films conductivities and Schottky diodes. Here, we extend our research to their electroluminescent properties. Multilayer light-emitting diodes composed of poly(3-octylthiophene) as light-emitting layer and hole transport layer are constructed. The current-voltage and brightness-voltage characteristics as well as the electroluminescent spectra are investigated and discussed.

Synthesis of Oligomeric P-Phenyleneimine by Self-Condensation Reaction of a Novel Monomer

ABSTRACTA new approach for the synthesis of poly(phenylenimines) and related conjugated polymers is presented. A novel bifunctional monomer, N-Boc-indoaniline 4 is synthesized as shown in scheme I. Thermolysis of the latter, either as solid, thin film or in solution of high boiling solvents, leads to polycondensation of the bifucntional monomer and results in the formation of poly(phenyleneimine) or its reduced form. Scope and limitation of this approach in the synthesis of various poly(aryleneimines) is also described.

Polymerization in a magnetic field: 1. Influence of esteric chain length on the synthesis of various poly(methacrylate)s

This paper describes the influence of an external continuous magnetic field on the radical bulk polymerization of methyl, ethyl and butyl methacrylates. The variation in the effect of the field on the ester's alkylic substituent length is described. The processes were compared with the classical bulk method. Some properties of the synthesized poly(methyl methacrylate), poly(ethyl methacrylate) and poly(butyl methacrylate) are also presented.

Cyclic ureas as solvents for poly(aryl ether) synthesis

The synthesis of various poly(aryl ethers) and related small molecule compounds were examined using the cyclic urea 1,3-Dimethyl-3,4,5,6-tetrahydro-2(IH)-pyrimidinone (N,N′-dimethylpropylene urea, DMPU) as the solvent. The results showed that generally higher molecular weight or yields were obtained under less stringent conditions, as compared to other common polymerization solvents. The enhancement was most notable for polymerizations involving aryl fluorides with a lower reactivity than conventionally activated dihalide monomers, e.g. ketones, sulfones. Poly(aryl ethers) displayed excellent solubility in DMPU, which was beneficial in the cases where more rigid heterocyclic-aryl ether polymers are formed.