Anionic polymerization with complex base. I. Polymerization of phenylisocyanate

Date

2001-01-01

Author

Usanmaz, Ali
Cevik, NN

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

86
views

0
downloads

In this work, phenylisocyanate was polymerized in bulk and in a solution of THF by the complex base (CB), NaNH2/(CH3)(3)CONa catalyst under vacuum. The percent yield for bulk polymerization at -20 degreesC first increased with a slow rate reaching 32% conversion in 3 hours, then with a greater rate up to 86% in 6 hours. However, at 0 degreesC the yields were relatively smaller and not very reproducible. The product obtained was a high molecular weight polymer, insoluble in most solvents, and partially crystalline. The polymerization in THF at -20 degrees gave 58% conversion in 9 hours with a high rate first, then a slower rate. The polymer samples were characterized by fractionation, FT-IR, DSC, NMR, TGA, and X-ray powder diffraction. The polymer samples in the solution polymerization contained trimer and oligomeric components. No glass transition temperature was observed at the temperature interval studied.

Subject Keywords

Monoisocyanade, Complex base, Ionic polymerization, Sodium amide, Sodium isobutoxide

URI

https://hdl.handle.net/11511/57426

Journal

JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY

DOI

https://doi.org/10.1081/ma-100103590

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Electrochemical and quantum chemical studies on mitomycin and adriamycin Ozalp-Yaman, S; Önal, Ahmet Muhtar; Turker, L (Elsevier BV, 2003-06-25) In-situ spectroelectrochemical redox behaviour of two prominent chemotherapeutic agents, mitomycin and adriamycin were studied at constant potential. AM 1 (UHF) type quantum chemical calculations on the neutral as well as radical anion and cation forms of mitomycin and adriamycin were performed.
PHASE-RELATIONS IN THE SYSTEM CE2O3-AL2O3 IN INERT AND REDUCING ATMOSPHERES TAS, AC; AKINC, M (Wiley, 1994-11-01) The 1:1 compound, CeAlO3, in the system Ce2O3-Al2O3 has been synthesized from the oxides and shown to have a perovskite-like tetragonal unit cell with the lattice parameters a = 3.763 and c = 3.792 Angstrom. A new XRD pattern is suggested for CeAlO3. This compound is shown to be stable up to 1950 degrees C. The 1:11 compound, CeAl11O18, has also been synthesized and shown to possess a magnetoplumbite-like hexagonal unit cell with the lattice parameters a = 5.558 and c = 22.012 Angstrom. An XRD pattern is su...
Thiophene ended epsilon-caprolactone conducting copolymers and their electrochromic properties Kerman, I; Toppare, Levent Kamil; Yilmaz, F; Yagci, Y (Informa UK Limited, 2005-04-01) epsilon-Caprolactone was polymerized by ring-opening polymerization (ROP), using thiophene methanol as the initiator and stannous octoate as the catalyst to yield poly(epsilon-caprolactone) with a thiophene end group. Homopolymerization of thiophene functionalized poly (epsilon-caprolactone) (PCL) was achieved by a constant current electrolysis method. Copolymerizations of PCL with thiophene and pyrrole were achieved in acetonitrile (ACN)-tetrabutylammonium tetrafluoroborate (TBAFB) solvent-electrolyte coup...
SYNTHESIS OF MAINLY LINEAR POLY(DICHLOROPHENYLENE OXIDE)S BY THERMAL POLYMERIZATION IN SOLUTION SANLI, O; KISAKUREK, D (1992-03-01) Thermal decomposition of bis(4-bromo-2,6-dichlorophenoxo)-(N,N,N',N'-tetramethylethylenediamine)copper(II) complex in toluene, bis(4-bromo-2,6-dichlorophenoxo)(N,N-dimethylformamide)copper(II) complex in N,N-dimethylformamide and bis(4-bromo-2,6-dichlorophenoxo)dimethyl sulfoxide)copper(II) complex in dimethyl sulfoxide was achieved at 70-degrees-C. 4-Bromo-2,6-dichlorophenol derivatives prefer 1,4-addition to 1,2-addition, leading to highly linear polymers irrespective of the substituted ligands. The compl...
Regioselective alkylation of dianions of cyclic 1.3-diketones via their monodimethylhydrazones. Synthesis of C-4 substituted cyclic 1.3-diketones Enders, Dieter; Demir, Ayhan Sıtkı (Elsevier BV, 1989-1) Cyclic 1.3-diketones are transformed into the corresponding monodimethylhydrazones, which can be alkylated regioselectively at C-4 via dianions with various alkyl halides. The regioselective alkylation of cyclic 1.3-diketones 1, to 4-substituted derivatives 4 is described.

Citation Formats

A. Usanmaz and N. Cevik, “Anionic polymerization with complex base. I. Polymerization of phenylisocyanate,” JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, pp. 559–576, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57426.