Observing Different Dynamic Behaviors of Weakly and Strongly Adsorbed Polystyrene Chains at Interfaces
作者：Xu Li, Xiaofeng Han, Xiaoliang Wang, Zhan Chen,* and Xiaolin Lu*
關鍵字：SFG, weakly adsorbed, strongly adsorbd, PS chains
論文來源：期刊
具體來源：Soft Matter, 2018,14, 2762-2766
發表時間：2018年
理論上界面強吸附和弱吸附的高分子鏈性質不同。
我們在藍寶石界面上制備了強吸附和弱吸附的高分子鏈，在良溶劑和非溶劑的作用下利用和頻振動光譜探測界面聚苯乙烯高分子鏈的構象。證實了強吸附的高分子鏈在界面比較剛硬，弱吸附的高分子鏈在界面比較柔軟。由于提供了分子鏈柔性與否的直接證據，文章作為Communication和front cover發表。
Published as a Soft Matter Communication and front cover one.
Understanding the dynamic behavior of polymer chains adsorbed onto a solid surface is of great importance for elucidating polymer-surface interactions. Here by using sum frequency generation (SFG) vibrational spectroscopy, we probed the conformational changes of weakly adsorbed and strongly adsorbed polystyrene (PS) chains on sapphire surfaces perturbed by nonsolvent (deuterated water, D2O) and good solvent (carbon tetrachloride, CCl4). The SFG results indicated that the PS chains in the weakly adsorbed state were flexible and the chain conformation could easily be altered. Differently, the PS chains in the strongly adsorbed state were rigid and the chain conformation could not be changed. The local structural variations for the weakly and strongly adsorbed PS chains at the interfaces were also discussed in detail with respect to the SFG spectral characteristics. These intriguing experimental results shed light on our understanding on molecular behaviors of polymer chains adsorbed onto a solid surface.
http://pubs.rsc.org/en/content/articlelanding/2018/sm/c7sm02503c#!divAbstract