Subtle End Group Functionalization of Polymer Chains Drives Surface Depletion of Entire Polymer Chains
Subtle End Group Functionalization of Polymer Chains Drives Surface Depletion of Entire Polymer Chains
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聚合物链的微妙端基官能化驱动整个聚合物链的表面损耗
DOI：
10.1021/acsmacrolett.8b00394
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发表时间：
2018
影响因子：
7.015
通讯作者：
Foster, Mark D.
中科院分区：
文献类型：
--
作者：
Hill, Jacob A.;Endres, Kevin J.;Meyerhofer, John;He, Qiming;Wesdemiotis, Chrys;Foster, Mark D.
6 kDa 聚苯乙烯和用羟甲基末端官能化的 6 kDa 聚苯乙烯的共混物的表面不仅耗尽了较高能量端基，而且还耗尽了属于官能化链的任何链段。这是通过表面层基质辅助激光解吸电离飞行时间质谱 (SL-MALDI-ToF-MS) 新兴技术来证明的，该技术可检测外表面具有任何重复单元的整个链，并且不需要标记。检测整个链提供了有关链功能化与整个链的表面偏析行为之间的关系的信息。表面的官能化链的内部链段以及末端的耗尽是显着的，因为单链末端的官能度涉及小于0.5wt%的官能化聚合物链。
The surface of a blend of 6 kDa polystyrene and 6 kDa polystyrene functionalized with hydroxymethyl ends not only is depleted of the higher energy end groups but also is depleted of any segments belonging to the functionalized chains. This is demonstrated using the emerging technique of surface layer matrix-assisted laser desorption ionization time-of-flight mass spectrometry (SL-MALDI-ToF-MS), which detects entire chains that have any repeat unit at the outer surface, and requires no labeling. Detecting entire chains provides information about the relationship of chain functionalization to surface segregation behavior of entire chains. That the surface is depleted of interior segments of functionalized chains as well as of the ends is remarkable, since the functionality at the single chain end involves less than 0.5 wt % of the functionalized polymer chain.