کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5197251 1381413 1998 8 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Low molar mass polybutadiene made crosslinkable by silane moities introduced via addition of thiol to double bond: 3. Synthesis and kinetic study
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Low molar mass polybutadiene made crosslinkable by silane moities introduced via addition of thiol to double bond: 3. Synthesis and kinetic study
چکیده انگلیسی
Low molar mass polybutadiene was made crosslinkable under moisture by the addition of mercapto propyl triethoxy silane to double bonds. The reaction was carried out at 75°C in the presence of AIBN as initiator. AIBN concentration and time showed that triethoxy silane groups were introduced quantitatively in the range of 1.05 to 7.9 per chain. A 1H n.m.r. study showed clearly that only vinylic units reacted at low modification rates. Volumetric titration of the remaining thiol was used to follow the reaction. A new mechanism is proposed here to lead to a kinetic relation, similar to the one already used by several authors, but kinetically provable. Moreover, it has been pointed out that there is probably an evolution of kinetic constants with the progress of the reaction due to, among other reasons, a local steric hindrance at the level of vinyl sequences and/or a variation in chain conformation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 39, Issue 20, September 1998, Pages 4955-4962
نویسندگان
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