期刊
POLYMER
卷 55, 期 26, 页码 6967-6972出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.11.011
关键词
Baroplasticity; Pressure dependence; Phase transition
资金
- NRF [2011-0022690]
- Nuclear RD Programs
- APCPI ERC - Ministry of Science, ICT & Future Planning (MSIP), Korea [2007-0056091]
- National Research Foundation of Korea [2011-0022690] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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, vertical bar dT/dP vertical bar, 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 (Delta V-mix) at transitions. (C) 2014 Elsevier Ltd. All rights reserved.
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