Time-resolved SANS studies on guest exchange processes in co-crystals of syndiotactic polystyrene
Time-resolved SANS studies on guest exchange processes in co-crystals of syndiotactic polystyrene
复制标题
DOI：
10.1016/j.polymer.2013.04.050
复制
发表时间：
2013-06-07
期刊：
影响因子：
4.6
通讯作者：
Ute, Koichi
中科院分区：
文献类型：
--
作者：
Kaneko, Fumitoshi;Radulescu, Aurel;Ute, Koichi
原位时间分辨小角中子散射首次应用于间同立构聚苯乙烯共晶中的客体交换现象，利用两种同位素体（完全质子化和氘代化合物）作为原始占据客体和被动占据客体之间相干散射长度的显著差异。质子化甲苯和氘代甲苯之间的气相诱导的客体交换过程，其次是监测由于结晶laminate的反射，这证实了小客体分子如甲苯的交换在结晶区顺利进行。在这种情况下，交换速率远高于暴露于客体蒸气诱导的从非晶态形成结晶络合物的速率。(c)2013爱思唯尔有限公司保留所有权利。
In-situ time-resolved small angle neutron scattering is applied to the guest exchange phenomenon in the co-crystals of syndiotactic polystyrene for the first time, exploiting the significant difference in coherent scattering length between two isotopologues, fully protonated and deuterated compounds, employed as originally-occupying and subsequently-occupying guests. The vapor-induced guest exchange process between protonated toluene and deuterated one is followed by monitoring the reflection due to crystalline lamellae, which confirms that the exchange of small guest molecules like toluene proceeds smoothly in the crystalline region. In such a case, the rate of exchange is much higher than the rate of crystalline complex formation from the amorphous state induced by exposure to a vapor of guest. (c) 2013 Elsevier Ltd. All rights reserved.