Anisotropy of hole structures in polymers probed by two-dimensional angular correlation of annihilation radiation.
Anisotropy of hole structures in polymers probed by two-dimensional angular correlation of annihilation radiation.
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DOI：
10.1103/physrevb.54.1785
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发表时间：
1996-07
期刊：
影响因子：
--
通讯作者：
Jean;Rhee;Lou;Yen;Cao;Cheong;Gu
中科院分区：
文献类型：
--
作者：
Jean;Rhee;Lou;Yen;Cao;Cheong;Gu
用二维角关联湮没辐射（2D-ACAR）实验研究了半结晶聚合物聚芳醚醚酮的湮没辐射。由动量分布确定的未拉伸和拉伸聚合物的二维孔结构分别为球形和椭圆形。在未拉伸的样品中，平均孔半径被确定为2.6 μ m，在拉伸的样品中，平均孔半径在1.9和3.6 μ m之间。本文讨论了二维ACAR方法在分子系统三维空穴、自由体积和空腔结构成像中的应用。© 1996美国物理学会。
Two-dimensional angular correlation of annihilation radiation (2D-ACAR) experiments have been performed in a semicrystalline polymer, polyaryl-ether-ether-ketone. The two-dimensional hole structures of unstretched and stretched polymers, determined from the momentum distributions, are found to be spherical and ellipsoidal, respectively. The average hole radii are determined to be 2.6 Å in the unstretched sample and between 1.9 and 3.6 Å in the stretched sample. Applications of the 2D-ACAR method to image the three-dimensional hole, free-volume, and cavity structures of molecular systems are discussed.© 1996 The American Physical Society.