AI 中文总结
该研究针对痕量大质量散射体掩盖聚合物本征信号的问题，提出模式分辨光散射法，成功分离聚合物与散射体贡献，恢复聚合物热力学性质，为相关定量分析提供可靠基础。
AI 中文摘要
光散射可直接获取聚合物的构象与热力学性质，但聚合物溶液中不可避免会形成聚集体、纳米气泡等痕量大质量散射体，这类散射体主导散射强度，掩盖了聚合物的本征信号。我们证明，通过分子运动分辨静态散射强度，可清晰分离聚合物与大散射体的贡献。将该模式分辨分析应用于聚乙二醇水溶液，即使这类散射体占总强度的90%以上，我们仍能分离出聚合物的散射信号。经分辨的聚合物强度可在288至358K温度范围内，从稀溶液到半稀溶液区间恢复通用渗透状态方程。该方法为测量溶液中相互作用大分子的热力学性质建立了可靠基础，这类溶液因不可重复的大质量散射体长期阻碍定量分析。
英文摘要
Light scattering provides direct access to polymer conformations and thermodynamics. However, trace large-mass scatterers such as aggregates and nanobubbles form unavoidably in polymer solutions and dominate the scattered intensity, obscuring the intrinsic polymer signal. We demonstrate that resolving the static scattering intensity by molecular mobility cleanly separates the polymer and large-scatterer contributions. Applying this mode-resolved analysis to aqueous poly(ethylene glycol) solutions, we isolate the polymer scattering even when these scatterers account for more than 90 % of the total intensity. The resolved polymer intensity recovers the universal osmotic equation of state from the dilute to the semidilute regime over 288 to 358 K. This approach establishes a reliable basis for measuring the thermodynamics of interacting macromolecules in solutions where irreproducible large-mass scatterers have precluded quantitative analysis.
Comments8+14 pages, 6+15 figures
