کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5180826 1380944 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Baroplastic behavior of miscible block copolymer blends
ترجمه فارسی عنوان
رفتار باروپلاستی مخلوط بلوک مخلوط می شود
کلمات کلیدی
باروپلاستسیتی، وابستگی به فشار، انتقال فاز،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی


- Pressure dependence of various phase transitions for the miscible block copolymer (BCP).
- The blends consist of a PS-b-PnBMA and a dPS-b-PnHMA.
- Excellent baroplasticity in nearly symmetric composition in the BCP blends.
- A baroplastic indicator as the entropic compressibility for the miscible BCP blends.

Pressure dependence of various phase transitions for the miscible block copolymer (BCP) blends was evaluated by depolarized light scattering (DPLS) and small-angle neutron scattering (SANS) measurements, in which the blends consist of a polystyrene-b-poly(n-butyl methacrylate) (PS-b-PnBMA) and a deuterated polystyrene-b-poly(n-hexyl methacrylate) (dPS-b-PnHMA). Excellent baroplasticity was observed in nearly symmetric blends of PS-b-PnBMA/dPS-b-PnHMA, leading to the most outstanding pressure coefficients, |dT/dP|, in a closed-loop type phase behavior between a lower disorder-to-order transition (LDOT) and an order-to-disorder transition (ODT) type phase behavior. Together with the estimated pressure coefficients based on the values of enthalpic and volumetric changes at phase transitions, we demonstrate that the entropic compressibility for the miscible BCP blends is a baroplastic indicator, which was characterized by the negative volume change on mixing (ΔVmix) at transitions.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 55, Issue 26, 15 December 2014, Pages 6967-6972
نویسندگان
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