Experimental Study of the Influence of Periodic Boundary Conditions: Effects of Finite Size and Faster Cooling Rates on Dissimilar Polymer–Polymer Interfaces
Experimental Study of the Influence of Periodic Boundary Conditions: Effects of Finite Size and Faster Cooling Rates on Dissimilar Polymer–Polymer Interfaces
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周期性边界条件影响的实验研究:有限尺寸和较快冷却速率对异种聚合物-聚合物界面的影响
DOI:
10.1021/acsmacrolett.7b00485
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发表时间:
2017
影响因子:
7.015
通讯作者:
Roth, Connie B.
中科院分区:
文献类型:
--
作者:
Baglay, Roman R.;Roth, Connie B.
Building on our recent work that mapped the profile in local glass transition temperatureTg(z) across a single polystyrene (PS)/poly(n-butyl methacrylate) (PnBMA) interface, we explore the impact of limiting domain size and increasing cooling rate. This study is motivated by traditional computational approaches employed to overcome computer-power limitations, extrapolating short time scales and using periodic boundary conditions that introduce repeating interfaces. Using a localized fluorescence method, we find addition of a second PS/PnBMA interface perturbs the local PSTg(z) at a distance ofz= 100 nm from the first interface when the second interface approaches a distance closer than 300 nm. The localTg(z) profile across a finite PS domain size of 300 nm for a range of cooling rates shows that limiting domain size and increasing cooling rate (faster time scales) diminishes and truncates the broad asymmetricTg(z) profile, weakening the confinement effect for dissimilar polymer–polymer interfaces, consistent with previous studies on single-layer polymer films.
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影响因子:
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--
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期刊:
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