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Zohreh Abdollahi,Masoud Frounchi,Susan Dadbin 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
High molecular weight homopolymers of acrylamide (PAM) and (2-methacryloyloxyethyl) trimethyl ammonium chloride (PDMC) and copolymer ofDMC with acrylamide (P(AM-co-DMC)) were synthesized using solution polymerization technique. The synthesized polymers were characterized by Fourier transform infrared (FTIR), 1HNMR, 13CNMR spectroscopy and differential scanning calorimetry (DSC)and viscometery. 1HNMR and 13CNMR studies confirmed the structure of the synthesized polymers. The behavior of the synthesized polymers was investigated in water–acetone and water–methanolmixtures. The plot of intrinsic viscosity of either PAM or P(AM-co-DMC) with respect to acetone (methanol)/water ratio in water–acetone (methanol) demonstrated a maximum indicating a balance between acetone or methanol hydrogen bonds with water and non-solvency effect of acetone or methanol. However, the intrinsic viscosity of PDMC decreased steadily with increasing acetone (methanol)/water ratio. The jar test results with kaolin suspensions demonstrated the best clarification with PDMC as flocculant whilst the largest size of flocs obtained using PAM.
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Composites of Carbon Nanotubes with the Blend of Poly(vinylidene fluoride)/Poly(vinyl acetate)
Razieh Davand,Masoud Frounchi 한국고분자학회 2016 폴리머 Vol.40 No.2
Poly(vinylidene fluoride)/poly(vinyl acetate)/carbon nanotubes, PVDF/PVAc/CNT, composite films were prepared at various compositions via a solution casting method. The amorphous PVAc formed a miscible blend with PVDF and drastically improved dispersion of CNT in PVDF/CNT composites. Combination of ductile PVAc and rigid CNT had favorable effects on mechanical properties of PVDF. The elongation of PVDF increased from 8% to 300% with addition of 40 wt% PVAc and 0.5 wt% CNT and the modulus at 1.5 wt% CNT was almost 2.3 fold of that of the neat PVDF while retaining high ductility and tensile strength. XRD and FTIR results showed that CNT favored formation of β-crystalline phase in PVDF. Also DSC results showed that the addition of CNT resulted in higher melting temperatures, Tm, and higher crystallinity. Electrical conductivity of the composite films increased sharply by addition of only 1 wt% CNT that attributed to development of CNT network morphology in PVDF/PVAc matrix.
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