کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675709 | 1454105 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and electrorheological properties of polyquin(2,3-b)acridine-12,14(5,7)dione-based suspensions
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
Novel polymeric electrorheological (ER) fluids were achieved by dispersing polyquin(2,3-b)acridine-12,14(5,7)dione (polyquinacridinedione, PQA) in bromodiphenylmethane (BDPM) and silicon oil, respectively; the conjugated polymer, PQA was synthesized via sequentially condensation, cyclization and oxidation from m-phenylenediamine and dimethyl 2,5-dioxocyclohexane-1,4-dicarboxylate. The structure characteristics of the PQA molecule and ER activity of the PQA-based suspensions were investigated. The results indicate that the PQA suspensions exhibited excellent ER activity both in BDPM and in silicon oil; the yield stress of the 30Â wt.% PQA suspension in BDPM reaches up to 4Â kPa under 3Â kV/mm. The yield stress of the suspensions increases with the dielectric constant of the liquid media. The excellent ER activity of the suspensions is attributed to the unique molecular structure of PQA: the non-localized Ï bond and polarizable groups within PQA molecule, as well as the plane ladder-like structure of PQA molecule, leading to high polarization of the particles of PQA, and forming strong fibrillated chain- or even net-like assembly under electric field, which leads to remarkable yield stress. The results also show that, for the PQA suspension in DBPM, the yield stress is proportion to the squared electric field and weight percent of particles, the apparent viscosity linearly increases with the squared electric field.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 264, Issues 1â3, 15 August 2005, Pages 55-60
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 264, Issues 1â3, 15 August 2005, Pages 55-60
نویسندگان
Zhanpeng Liu, Yuanbin Lin, Xiaohong Wen, Qiong Su,