کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187356 | 1381127 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quantification of spontaneous initiation in radical polymerization of styrene in aqueous miniemulsion at high temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The spontaneous (thermal) initiation rate (Ri,th; no added initiator) in radical polymerization of styrene in aqueous miniemulsion at 110 and 125 °C with sodium dodecylbenzenesulfonate or poly(vinyl alcohol) as surfactants (colloidal stabilizers) has been estimated using a novel approach based on the total number of chains. In qualitative agreement with previous work at lower temperatures, Ri,th was found to be 3.1-15.1 times greater than that in bulk. According to the activation energy and conversion dependence of Ri,th, the radical generation mechanism differs from that in bulk. The experimental evidence is consistent with the enhanced Ri,th in miniemulsion being related to the oil-water interface, with radical generation in the aqueous phase playing a negligible role. The implications with regards to nitroxide-mediated radical polymerization in aqueous dispersed systems are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 49, Issue 4, 18 February 2008, Pages 883-892
Journal: Polymer - Volume 49, Issue 4, 18 February 2008, Pages 883-892
نویسندگان
Md. Nur Alam, Per B. Zetterlund, Masayoshi Okubo,