کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5191899 1381242 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reaction induced phase-separation controlled by molecular topology
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Reaction induced phase-separation controlled by molecular topology
چکیده انگلیسی
Binary phase-separation driven by a difference in branch content of the two components has been widely reported in polyolefins. This concept is applied to polysiloxanes in an attempt to control morphology in chemically driven phase separation. It is shown that self-assembled, non-reversible spinodal morphologies (SD) as well as low-polydispersity nucleation and growth morphologies can be controlled through the rate of network formation in these systems. Time-resolved light scattering and optical microscopy were used to determine the character and kinetics of phase separation. The mechanism of phase separation in two similar systems was dictated by the rates of the crosslinking reactions. Both morphologies were 'locked-in' by network formation and late-stage phase-ripening was prevented by low surface energy associated with topologically driven phase-separation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 12, 26 May 2005, Pages 4454-4464
نویسندگان
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