High-performance family of polymeric particles prepared from poly(phenylene oxide)-poly(hexyl isocyanate) liquid crystal block copolymer: synthesis and properties study

• Published in: Polymers & polymer composites Vol. 30
• Main Authors: Semsarzadeh, Mohammad Ali, Sh Dadkhah, Arezoo, sabzevari, Alireza
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.06.2022; Sage Publications Ltd
• Subjects: Block copolymers; Chemical synthesis; Copolymers; Fourier transforms; Infrared spectra; Isocyanates; Ligands; Liquid crystals; Mechanical properties; Methods; Microscopy; Molecular weight; NMR; Nuclear magnetic resonance; Optical microscopes; Polymerization; Polymers; Room temperature; Solvents; Spectrum analysis; Temperature; Thermogravimetric analysis; Titanium; organotitanium copolymerization; poly(hexyl isocyanate) (PHIC); Poly(phenylene oxide) (PPO); particles; liquid crystal
• ISSN: 0967-3911; 1478-2391
• DOI: 10.1177/09673911221104678

The poly (phenylene oxide)-block-poly (hexyl isocyanate) copolymers (PPO-b-PHIC)s were synthesized in various ratios of blocks using the organotitanium coordination method at room temperature. The copolymer particles were prepared by precipitation of concentrated solution of the copolymers in non-solvent under stirring. The synthesized copolymers and their particles were characterized by 1H and 13C nuclear magnetic resonance (1H and 13C NMR), Fourier transform infrared (FTIR) spectra, differential scanning calorimetry (DSC), polarized optical microscope (POM), thermogravimetric analysis (TGA) and scanning electron microscope (SEM). The effect of block ratio on the anisotropic-isotropic transition and liquid crystal texture of copolymers as a function of temperature and concentration of the solution was investigated. The polymeric particles tend to be aligned along the fibrillar direction by increasing the block ratio of amide in the copolymer.