Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
Langmuir. 2010 May 4;26(9):6625-9. doi: 10.1021/la903961a.
Pluronics are triblock copolymers of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide). Pluronic P85 forms a rich phase behavior when dissolved in water. Unimers are observed at low temperature while micelles form at higher temperatures. Spherical, cylindrical, and lamellar micelles are observed sequentially upon heating. The effect of hydrostatic pressure on the phase boundaries is investigated here using small-angle neutron scattering from a dilute P85 solution in deuterated water. The transition temperatures between these micelle phases are found to rise with increasing pressure. A new phase corresponding to demixed lamellae was observed at high temperature. The effect of pressure was seen to decrease the onset formation line of that new phase.
普朗尼克是聚（氧化乙烯）-聚（氧化丙烯）-聚（氧化乙烯）的三嵌段共聚物。当普朗尼克 P85 溶解在水中时，会形成丰富的相态行为。在低温下观察到单体，而在较高温度下形成胶束。在加热过程中依次观察到球形、圆柱形和层状胶束。本文使用氘化水中稀释的 P85 溶液的小角中子散射研究了静压对相界的影响。发现这些胶束相之间的转变温度随压力的增加而升高。在高温下观察到对应于混合层的新相。压力的影响被认为降低了新相的起始形成线。
