List of Articles Zahra Khoubi-Arani

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  Zahra Khoubi-Arani
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  Zahra Khoubi-Arani
  20.1001.1.25383345.1400.6.21.1.9
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  3 - Semi-Experimental Methods for Determination of Flory-Huggins Interaction Parameter in Polymeric Mixtures: A Review
  Zahra Khoubi-Arani
  The Flory-Huggins interaction parameter (χ) is a crucial factor affecting the miscibility and morphology of components in polymer mixtures and their final properties and applications. The reliable measurement of the interaction parameter is worthwhile in fundamental und More

  The Flory-Huggins interaction parameter (χ) is a crucial factor affecting the miscibility and morphology of components in polymer mixtures and their final properties and applications. The reliable measurement of the interaction parameter is worthwhile in fundamental understanding and quantitative determination of structure-performance relation and finally in practical applications of polymers in different fields. Different methods are used for evaluation of this parameter. In this study, six semi-experimental methods are reviewed: measurement of melting point depression, equilibrium swelling, contact angle, phase separation points, vapor pressure, and inverse gas chromatography. In these methods, equilibrium melting temperatures of pure polymer and its mixtures, degree of equilibrium swelling of the cross-linked polymer in the presence of swelling agent, surface energy of components in the polymeric mixtures, equilibrium components composition in the two-phase system, the ratio of partial vapor pressure of solvent to its saturated one and retention volume are experimentally measured, respectively. Then a proper equation is fitted on the data and the interaction parameter is obtained. In some methods, such as measurement of contact angle, only a positive interaction parameter at temperature of the test is obtained. But in some others, such as measurement of melting point depression, there is no constraint for the sign of interaction parameter. In addition, some methods can determine the composition dependency of the interaction parameter, such as determination of phase separation points. Manuscript profile
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  4 - Recycling of Waste Tires
  Zahra Khoubi-Arani
  Waste tires are the main source of waste rubbers. Their recycling raises environmental concerns due to the high volume of production as well as a very crosslinked and non-biodegradable structure. This leads to finding easy, low-cost, and energy-efficient methods for rec More

  Waste tires are the main source of waste rubbers. Their recycling raises environmental concerns due to the high volume of production as well as a very crosslinked and non-biodegradable structure. This leads to finding easy, low-cost, and energy-efficient methods for recycling waste tires. To now, many studies have been devoted to the improvement of conventional recycling methods and the introduction of new ones for the management of waste tires. Methods for recycling waste tires include retreading, incineration, pyrolysis, and grinding. The lifetime of a tire can be extended using the retreading process, in which the old tread is removed and a new one is inserted. The produced energy from the incineration of the waste tire can be used as a fuel source for steam, electrical energy, paper paste, paper, lime, and steel production. In the pyrolysis process, oil, gas, and char are produced through thermal decomposition. The main method of waste tire recycling is grinding for the incorporation of produced particles in the polymer matrices. The ambient and cryogenic grinding are the most conventional methods for grinding waste tires. The size reduction results in a higher specific area and better distribution of rubber particles in the matrix. The produced particles can be used as fillers in asphalt, concrete and glassy polymers. Manuscript profile