Growth of Polymer Nanorods with Different Core鈥揝hell Dynamics via Capillary Force in Nanopores

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• 作者：Ye Sha ; Linling Li ; Xiaoliang Wang ; Yuanxin Wan ; Jie Yu ; Gi Xue ; Dongshan Zhou
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：December 23, 2014
• 年：2014
• 卷：47
• 期：24
• 页码：8722-8728
• 全文大小：436K
• ISSN：1520-5835

文摘

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 (T_g,low and T_g,high) are obtained at higher infiltration temperatures via capillary force followed by slow cooling. T_g,low resembles the T_g of the bulk phase and represents the transition of the core layer. T_g,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鈥搒hell nanofibers with one glassy and one rubbery component without the need for block polymers have promising potential for use in several processing strategies.