The phase transition behavior of poly(butylene adipate) in the nanoporous anodic alumina oxide
The phase transition behavior of poly(butylene adipate) in the nanoporous anodic alumina oxide
复制标题
聚己二酸丁二醇酯在纳米多孔阳极氧化铝中的相变行为
DOI：
10.1039/c5py01532d
复制
发表时间：
2016
影响因子：
4.6
通讯作者：
Yan, Shouke
中科院分区：
文献类型：
--
作者：
Ren, Zhongjie;Li, Huihui;Sun, Xiaoli;Yan, Shouke
制备了不同直径的PBA纳米管。用X射线衍射和差示扫描量热法研究了其结晶行为和相变行为。对于等温熔融结晶，结晶相的温度依赖性和阳极氧化铝（AAO）模板中的PBA晶体的取向是非常不同的块体。在AAO模板中，特别是在窄孔中，α相的b轴倾向于平行于孔的长轴取向。此外，原位X射线实验表明，在高结晶温度下，一些分子链不能填充到AAO模板中的晶格中，并且它们只有在冷却回室温后才能够结晶。AAO模板中存在PBA的核壳结构，导致在较高的结晶温度下，PBA的α晶型不能完全结晶，在冷却后的样品中形成β晶型。β-晶体在加热过程中的相变行为也受到纳米孔限制的影响。AAO模板抑制了β晶胞的膨胀，改变了β向α的相变行为。在缓慢的加热速率下，与本体中的β-PBA相比，β-晶体在模板中以较慢的速率转变为α-晶体。在快速升温条件下，较少的β晶转变为α晶，较多的β晶倾向于直接熔融在AAO模板中。
PBA nanotubes with different diameters have been prepared. The crystallization behavior and phase transition behavior have been explored by using X-ray diffraction and DSC. For isothermal melt crystallization, the temperature dependence of the crystal phase and the orientation of PBA crystals in the Anodic Alumina Oxide (AAO) templates are very different from that of the bulk. In the AAO templates, especially in the narrow nanopores, the b-axis of the α phase prefers to adopt the orientation parallel to the long axis of the pore. In addition, an in situ X-ray experiment indicates that some molecular chains cannot pack into the crystal lattice in the AAO template at high crystallization temperature, and they are able to crystallize only after cooling back to room temperature. The core–shell structure of PBA exists in the AAO template, which leads to the incomplete crystallization of the α form at higher crystallization temperature and the formation of β-crystals in the cooled sample. The phase transition behavior of β-crystals in the heating process is also affected by nanoporous confinement. The expansion of the β-crystal unit cell is depressed and the phase transition behavior of β to α is altered in the AAO template. At a slow heating rate, compared to the β-PBA in bulk, β-crystals transit to α-crystals at a slower rate in the templates. At a fast heating rate, less β-crystals transit to α-crystals and more β-crystals prefer to melt directly in the AAO templates.
登录
查看更多内容
影响因子：
4.6
作者：
Yiming Sun;M. Steinhart;Danilo Zschech;R. Adhikari;G. Michler;U. Gösele
通讯作者：
Yiming Sun;M. Steinhart;Danilo Zschech;R. Adhikari;G. Michler;U. Gösele
影响因子：
8.6
作者：
Euntaek Woo;J. Huh;Y. Jeong;Kyusoon Shin
通讯作者：
Euntaek Woo;J. Huh;Y. Jeong;Kyusoon Shin
影响因子：
9.5
作者：
Du, Ke;Gan, Zhihua
通讯作者：
Gan, Zhihua
影响因子：
5.5
作者：
Ye Sha;Linling Li;Xiaoliang Wang;Yuanxin Wan;Jie Yu;G. Xue;Dongshan Zhou
通讯作者：
Ye Sha;Linling Li;Xiaoliang Wang;Yuanxin Wan;Jie Yu;G. Xue;Dongshan Zhou
影响因子：
6.2
作者：
Gan, ZH;Kuwabara, K;Doi, Y
通讯作者：
Doi, Y