Subtle End Group Functionalization of Polymer Chains Drives Surface Depletion of Entire Polymer Chains,ACS Macro Letters

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Subtle End Group Functionalization of Polymer Chains Drives Surface Depletion of Entire Polymer Chains
ACS Macro Letters ( IF 5.1 ) Pub Date : 2018-06-21 00:00:00 , DOI: 10.1021/acsmacrolett.8b00394
Jacob A Hill ₁ , Kevin J Endres ₁ , John Meyerhofer _{1,

2} , Qiming He ₁ , Chrys Wesdemiotis _{1,

3} , Mark D Foster ₁

Affiliation

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.

中文翻译：

聚合物链的微妙端基官能化驱动整个聚合物链的表面消耗

用羟甲基末端官能化的 6 kDa 聚苯乙烯和 6 kDa 聚苯乙烯的混合物的表面不仅耗尽了较高能量的端基，而且也耗尽了属于官能化链的任何链段。使用新兴的表面层基质辅助激光解吸电离飞行时间质谱 (SL-MALDI-ToF-MS) 技术证明了这一点，该技术检测在外表面具有任何重复单元的整个链，并且不需要标签。检测整条链提供了有关链功能化与整条链的表面分离行为之间关系的信息。由于单链末端的官能度小于 0，因此表面缺少官能化链的内部链段以及末端是显着的。

更新日期：2018-06-21

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