Thermotropic transition from a state of liquid order to a macrolattice in asymmetric diblock copolymers.
Thermotropic transition from a state of liquid order to a macrolattice in asymmetric diblock copolymers.
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不对称二嵌段共聚物中从液态有序状态到大晶格状态的热致转变。
DOI：
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发表时间：
1996
影响因子：
8.6
通讯作者：
B. Stühn
中科院分区：
文献类型：
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作者：
M. Schwab;B. Stühn
用小角X射线散射法研究了不对称聚苯乙烯/聚异戊二烯两嵌段共聚物的无序-有序转变。在高温下的均匀无序态和体心立方有序的球体阵列之间，我们发现了球域之间的液体有序的稳定状态。在硬球液体的Percus-Yevick理论的框架内，对这个级数的定量分析是可能的。当球体体积分数为0.47时，发生向有序状态的转变。球体的大小可以在无序和有序状态下确定，并且随着温度的降低而不断增加。
The disorder-to-order transition in asymmetric diblock copolymers of polystyrene/polyisoprene is studied using small angle x-ray scattering. In between the homogeneously disordered state at high temperature and the bcc ordered array of spheres we find a stable state of liquidlike order between the spherical domains. Quantitative analysis of this order is possible in the framework of the Percus-Yevick theory for hard sphere liquids. The transition to the ordered state occurs at a sphere volume fraction of 0.47. The size of the spheres may be determined in the disordered as well as the ordered state and is found to increase continuously with decreasing temperature.