Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Preparation of Cubic Micro Particles from Poly (phenylene oxide)-block-poly (phenyl isocyanate) Copolymer

Document Type : Research Article

Authors
Mohammad Ali Semsarzadeh
Arezoo Sh. Dadkhah
Polymer Group, Chemical Engineering Department, Tarbiat Modares University, P.O.Box: 14155/143, Tehran, I.R. IRAN
Abstract
In this research, poly (ether)-block-poly (amide) copolymer was synthesized from polyphenylene oxide (PPO) and phenyl isocyanate (PIC) via coordination polymerization in the presence of TiCl4 and dried toluene. The effects of temperature, reaction time, TiCl4/PPO ratio, the concentration of monomer and toluene as a solvent on the yield of copolymerization were investigated. Chemical structure of block copolymer was confirmed by Hydrogen Nuclear Magnetic Resonance (1H NMR) spectroscopy. 1H NMR results were in good agreement with gel permeation chromatography (GPC). Molecular weight and molecular weight distribution of the copolymer are 5806 g/mol and 1.25, respectively. Thermal properties of the copolymer were studied by Differential Scanning Calorimetry (DSC) measurement, in which the glass transition (Tg) of amide and ether blocks were 84˚C and 164˚C, respectively. The freeze-grinding method was used for the preparation of particles (grinding time = 2 hours). Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM) images exhibited micrometric and nano metric particles with regular and cubic structure. Obtained results from X-Ray Diffraction (XRD) showed that synthesized copolymer particles have a simple cubic crystal lattice of [100], [110], and [111].
Keywords
Ether-amide copolymer
Phenylene oxide
Phenyl isocyanate
Particles
Cubic

Subjects

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