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您的检索式：作者名="Matthew J.Graham"
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| 1 | PHASE STRUCTURES AND TRANSITION BEHAVIORS OF A TRIPHENYLENE DISCOTIC LIQUID CRYSTAL显示文摘The phase behaviors and structures of a triphenylene-derived discotic liquid crystal (LC) hexa-n-octoxyl-triphenylene (C8HET) were studied using the combined techniques of differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), selected area electron diffraction (SAED) and polarized light microscopy (PLM). One-dimensional (1D) powder WAXD results at different temperatures coupled with DSC and PLM observations revealed that the C8HET compound possessed an LC phase and three different crystalline (K3, K2 and K1) phases below the isotropic (I) melt. The I (?) LC phase transition was thermodynamically reversible and independent of the heating and cooling rates. The development and experimental observation of the three crystalline phases relied on different thermal histories. Among the three crystalline phases in C8HET, the K3 phase is the most stable phase, while the K2 and K1 phases are metastable. Note that the K1 phase only formed via a quenching process. On the basis of structure sensitive diffraction experiments such as 2D WAXD of oriented samples and SAED of single crystals, detailed structures and molecular packings of these four ordered phases were identified. The LC phase exhibited a hexagonal columnar phase with 2D lattice dimensions of a = b = 2.38 nm andγ= 120°. All the three crystalline phases possess monoclinic unit cells, yet theγangle is not 90°in the cases of the K2 and the K3 phases, while in the case of the K1 phase theαangle is not 90°. | Kwang-Un Jeong Alexander J.Jing Bart Mansdorf Matthew J.Graham Frank W.Harris 程正迪 | 2007 | Chinese Journal of Polymer Science2007，25，1： | 0 |
| 2 | WHAT ARE THE DIFFERENCES OF POLYMER SURFACE RELAXATION FROM THE BULK?显示文摘在薄电影的聚合物表面松驰是一个长辩论问题。我们报导聚合物的表面松驰行为变瘦的学习上的一个新方法在稳固的底层上拍摄。这个方法涉及在液体与一个 pretilting 角度利用磨擦 polyimide 表面水晶的房间。由于表面排列,液体晶体沿着磨擦方向被排列。在加热液体期间水晶的房间,我们连续地监视了液体晶体的取向的变化。在液体水晶的取向被失去的温度,玻璃底层上的表面松驰发生失去 polyimide 表面取向,这被理解。液体晶体在失去他们的取向的松驰温度取决于 polyimide 的电影厚度,这被发现。在松驰温度之间的一种量的线性关系并且电影厚度相互能被观察。而且,不同拓扑学磨擦了并且放松薄电影用聚乙烯装饰方法被放大并且遵守了使用原子力量显微镜学。 | Ian Mann Ryan M.Van Horn Jason J.Ge Matthew J.Graham Frank W.Harris Stephen Z.D.Cheng | 2011 | Chinese Journal of Polymer Science2011，29，1： | 0 |
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