کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5182354 1380987 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The influence of one block polydispersity on phase separation of diblock copolymers: The molecular mechanism for domain spacing expansion
ترجمه فارسی عنوان
تأثیر یک پلییدریسپسی یک بلوک بر جداسازی فاز کوپلیمرهای دیافلوک: مکانیزم مولکولی برای گسترش فاصله دامنه
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

Comprehensive dissipative particle dynamics simulations are performed to investigate the effect of A-block polydispersity on the phase behavior of AB-diblock copolymers. The experimental results of Lynd and Hillmyer on polydispersity induced domain spacing expansion at different segregations (Macromolecules 2005, 38, 8803) are well reproduced and explained in terms of interfacial free energy and molecular stretching in domain center. Short block copolymers in polydisperse system are found to preferably accumulate at A/B interface as compatibilizers causing a reduction in interfacial free energy. At the same time, domain centers are found mainly occupied by long blocks which in turn determining the spacing of the corresponding domain. More importantly, increase in polydispersity will introduce more long blocks into system and therefore will enhance the molecular packing and stretching in the domain center. Such chain stretching in domain center and reduction in interfacial free energy are found to be more severe at stronger segregation, which will lead to more severe domain spacing expansion with increasing polydispersity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 54, Issue 14, 21 June 2013, Pages 3716-3722
نویسندگان
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