Growth of Polymer Nanorods with Different Core–Shell Dynamics via Capillary Force in Nanopores
Growth of Polymer Nanorods with Different Core–Shell Dynamics via Capillary Force in Nanopores
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DOI：
10.1021/ma5017715
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发表时间：
2014-12
期刊：
影响因子：
5.5
通讯作者：
Ye Sha;Linling Li;Xiaoliang Wang;Yuanxin Wan;Jie Yu;G. Xue;Dongshan Zhou
中科院分区：
文献类型：
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作者：
Ye Sha;Linling Li;Xiaoliang Wang;Yuanxin Wan;Jie Yu;G. Xue;Dongshan Zhou
采用差示扫描量热法（DSC）和荧光非辐射能量转移法（NRET）研究了聚甲基丙烯酸正丁酯（PMMA）在多孔阳极氧化铝（AAO）模板中的动力学行为。两个玻璃化转变温度（Tg，低和Tg，高）获得在较高的渗透温度通过毛细管力，然后缓慢冷却。Tg，low类似于体相的Tg，代表芯层的转变。Tg，high表示受限聚合物玻璃中吸附层的转变。形成一个或两个玻璃化转变的温度阈值通过调节渗透温度和孔径来确定。结果表明，吸附层相对于本体具有增加的链间接近性。此外，玻璃化转变行为被假设为介导的有限空间中的尺寸和界面效应的平衡。结果表明，该方法制备的核壳结构纳米纤维具有良好的力学性能。
The dynamics of poly(n-butyl methacrylate) confined in porous anodic aluminum oxide (AAO) templates are investigated using differential scanning calorimetry (DSC) and fluorescence nonradiative energy transfer (NRET). Two glass transition temperatures (Tg,low and Tg,high) are obtained at higher infiltration temperatures via capillary force followed by slow cooling. Tg,low resembles the Tg of the bulk phase and represents the transition of the core layer. Tg,high represents the transition of the adsorbed layer in the confined polymer glass. The temperature threshold to form one or two glass transitions is determined by adjusting the infiltration temperatures and the pore diameters. It is shown that the adsorbed layer has increased interchain proximity relative to the bulk. In addition, the glass transition behavior is hypothesized to be mediated by the counterbalance of the size and interfacial effects in the confined space. The easily synthesized core–shell nanofibers with one glassy and one rubbery compon...