半稀Polymer溶液自扩散和协同扩散的荧光相关光谱研究
Self-diffusion and Cooperative Diffusion in Semidilute Polymer Solutions as measured by Fluorescence Correlation Spectroscopy
摘要：
我们提出了一个全面的调查聚合物扩散在半稀释制度的荧光相关光谱（FCS）和动态光散射（DLS）。使用单标记的聚苯乙烯链，FCS导致自扩散系数，而DLS给出完全相同的分子量和浓度的合作扩散系数。使用FCS，我们观察到一个新的快模式在半纠缠浓度制度以外的慢模式，这是由于自扩散。FCS数据与DLS获得的数据在相同的聚合物的比较表明，在FCS中观察到的第二模式是相同的合作扩散系数与DLS测量。通过深入分析和与现有理论模型的比较表明，FCS中观察到的这种新的合作模式是由于链之间通过瞬态纠缠网络进行有效的长程相互作用。
英文摘要：
We present a comprehensive investigation of polymer diffusion in the semidilute regime by fluorescence correlation spectroscopy (FCS) and dynamic light scattering (DLS). Using single-labeled polystyrene chains, FCS leads to the self-diffusion coefficient while DLS gives the cooperative diffusion coefficient for exactly the same molecular weights and concentrations. Using FCS we observe a new fast mode in the semidilute entangled concentration regime beyond the slower mode which is due to self-diffusion. Comparison of FCS data with data obtained by DLS on the same polymers shows that the second mode observed in FCS is identical to the cooperative diffusion coefficient measured with DLS. An in-depth analysis and a comparison with current theoretical models demonstrates that the new cooperative mode observed in FCS is due to the effective long-range interaction of the chains through the transient entanglement network.
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