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几乎理想的随机与十二角对称性从五角块 AB₁CB₂D 类型的四分聚合物

Yushu Matsushita¹, Mitsuhiko Ohta¹, Noritomo Suzuki¹

¹Toyota Physical and Chemical Research Institute, Yokomichi 41-1, Nagakute, Aichi 480-1192, Japan.

|June 19, 2024

概括

五四分聚合物形成有序的,非周期的三角形/正方形,类似于准晶体. 一个特定的混合物与理论预测密切相匹配,在较小的尺度上具有最小的阶段应变.

科学领域:

聚合物科学聚合物科学
材料科学是一种材料科学.
纳米技术纳米技术

背景情况:

研究区块共聚合物的复杂自我组装对于设计先进材料至关重要.
了解聚合物架构和产生的纳米结构之间的关系是财产控制的关键.

研究的目的:

探索AB1CB2D五角块四分之一聚合物的散装圆柱体域组件中的二维形图案.
分析这些聚合物的半晶性质和对称性.

主要方法:

三种母聚合物的合成和混合,其中B1和B2块体积分数不同 (φB1/φB2).
传输电子显微镜 (TEM) 用于成像领域组件.
图像分析以确定N3/N4比率并评估对称性.
扫描场理论 (SCFT) 进行理论比较.

主要成果:

二元和三元混合物形成了有序的,非周期的三角形/方形.
N3/N4比率接近了十二角形半晶体 (DDQC) 状态的理论值.
对TEM图像的分析显示了4倍和6倍的对称性.
一个三元混合物表现出一种接近理想的随机形模式,与SCFT预测一致.
在狭窄的TEM图像区域中,Phason应变是最小的,但随着更多的顶点而增加.

结论:

五块块四分之一聚合物可以自组装成复杂的准晶状状.
观察到的瓦片显示了聚合物组成和结构秩序之间的强烈相关性.
SCFT提供了一个可靠的模型来预测这些复杂的纳米结构.
帕森菌株是影响偏离理想准晶体秩序的一个重要因素.

关键词:

五角板四分之一聚合物五角板.这是一种Phason菌株.具有十二角形对称性的准晶.随机地进行片.三角形/正方形片的使用方法

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