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RISS 인기검색어
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- 저자 : Hossein Barani (검색결과 4 건)
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Investigation on Polyacrylonitrile/Cellulose Acetate Blends
Barani, Hossein,Bahranmi, Seyad Hajir The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.7
The molecular interactions of polyacrylonitrile (PAN) and cellulose acetate (CA) were investigated thoroughly via dilute solution viscometry in dimethylformamide (DMF) as a common solvent at $30^{\circ}C$. The intrinsic viscosities and viscometric interaction parameters were experimentally determined for both binary (polymer/dimethylformamide) and ternary (PAN/CA/dimethylformamide) systems. As all investigated PAN/CA ternaries evidenced negative viscometric interaction parameter values $({\Delta}b\;&{\Delta}k<0)$, the existence of repulsive intermolecular interactions was deduced, and PAN/CA blends were assigned as immiscible. Moreover, the results of microscopy photograph analysis indicated that pure PAN film evidences a homophasic structure, and the size of the phase domain increases gradually with increases in CA. In DSC analysis, it was determined that the glass transition temperature of the blend film increased slightly with increases in the CA content of the blend film.
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Hossein Barani,Farnoosh Rahm 한국섬유공학회 2023 Fibers and polymers Vol.24 No.8
Opuntia ficus-indica well adapts to extreme climate conditions and grows rapidly in low water and poor soil requirement. In this study, the Opuntia ficus-indica fruit was used for natural dyeing of wool yarn. The Opuntia ficus-indica fruit has a reddish-purple color, due to the presence of water-soluble betalain colorants. When using this fruit as a natural dye, it is possible to obtain various color shades, because its color changes depending on the dyeing conditions. However, it is difficult to control the dyeing environment to reproduce the original color of Opuntia ficus-indica fruits. The aim of this study is to examine the effect of various dyeing conditions on the color strength, and color shades of Opuntia ficus-indica fruit. Ascorbic acid as a bio-mordant was applied for enhancing the stability of the betalain colorants. For this purpose, the betalain dye was extracted from Opuntia ficus-indica fruit by an aqueous extraction and used for dyeing wool samples in the presence of ascorbic acid at different dyeing process conditions. The dyed wool samples presented a red, pale red, orange, pale brown, and brown color by varying the applied pH (3, 5.5, and 8) of the dye bath, and dyeing temperature (40, 65, and 90 °C). Applying ascorbic acid as an antioxidant enhanced the color strength (~ 110%), thermal stability (~ 22%), and color fastness values. In addition, the presence of ascorbic acid did not have any significant effect on the tensile properties of the dyed wool yarns.
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Iman Islami,Amir Sadoddin,Hossein Barani,Ahmadreza Asgharpourmasoule,Masih Akhbari 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.2
Participation of local ranchers for developing livestock drinking water resources has been identified as inadequate in Yazd Province located in the central part of Iran. Thorough understanding of barriers among various factors influenc-ing the public participation is complex. In this study, to evaluate and prioritize the influencing criteria and parameters, ANP was used in which relationships are considered in form of non-linear. The information required in this study were collected using tools of questionnaire and expert knowledge elicitation. The results show a combined effect of various criteria on level of participation with different relative weights. Economic criterion in this study with normal weight of 0.455 represents 1.5 times more importance compared with climatic criterion and 2 times more importance in comparison to social criterion. Analysis indicates that following parameter of “Low income of animal husbandry” with normal weight of 0.319, as the most important influencing economic factor, climatic parameter of “Recurrent droughts and reduced rainfall” with normal weight of 0.153, and social parameter of “Poor role of NGOs” with nor-mal weight of 0.093, respectively represent the most important parameters in the context of this study. ANP model facilitates assessment and provides more detailed information for the decision makers.
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