The Lifshitz line of the disordered and microemulsion phase in an A/B/A–B three component homopolymer/diblock copolymer mixture

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• 作者：Pipich ; Vitaliy ; Schwahn ; Dietmar ; Willner ; Lutz
• 关键词：61.25.Hq ; 64.60.Cu ; 64.60.Fr ; Ternary polymer blend ; Lifshitz line ; Double critical point ; SANS
• 刊名：Physica B
• 出版年：2004
• 出版时间：July 15, 2004
• 年：2004
• 卷：350
• 期：1-3, Supplement
• 页码：E897-E900
• 全文大小：347 K

文摘

Thermal composition fluctuations were measured in a homopolymer blend dPB/PS (dPB/dPS) of critical composition mixed with different amounts of a symmetric diblock copolymer dPB–PS (PB and PS being polybutadiene and polystyrene, respectively) with small-angle neutron scattering (SANS). From thermal fluctuations the two-phase boundary, two critical universality classes and the Lifshitz line were derived. The bicontinuous microemulsion phase could be identified by the characteristic peak positions of samples prepared in bulk, block and film contrast. A non-monotonic Lifshitz line (LL) showing a dependence on temperature was found. LL is located in the disordered and bicontinuous microemulsion phase.