The puzzle of poly(ethylene oxide) aggregation in water:: Experimental findings
The puzzle of poly(ethylene oxide) aggregation in water:: Experimental findings
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DOI：
10.1063/1.477888
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发表时间：
1999-01-15
影响因子：
4.4
通讯作者：
Villari, V
中科院分区：
文献类型：
--
作者：
Faraone, A;Magazù, S;Villari, V
利用超声波技术、光子相关光谱（PCS）和核磁共振（NMR）研究了聚环氧乙烷（PEO）在宽分子量范围（从乙二醇到聚环氧乙烷4 000 000 Da）内的水溶液。超声波数据显示，混合过程是不理想的，并显示聚合物-水的相互作用强度增加的聚合度。PCS和NMR，另一方面，提供了一个自由粒子扩散系数，它满足一个独特的标度律从8000至4 000 000 Da，并证明了良好的溶剂性质的水。这些实验结果表明，聚合物-聚合物聚集过程不是这些系统的固有特性。(C)1999年美国物理学会。[S0021-9606（99）51302-0]。
Aqueous solutions of poly(ethylene oxide) were investigated using the ultrasonic technique, photon correlation spectroscopy (PCS) and nuclear magnetic resonance (NMR), in a wide range of molecular weight (from ethylene glycol to poly(ethylene oxide) 4 000 000 Da). Ultrasonic data reveal that the mixing process is not ideal and show that the polymer-water interaction strength increases with the polymerization degree. PCS and NMR, on the other hand, furnish a free particle diffusion coefficient which satisfies a unique scaling law from 8000 to 4 000 000 Da and demonstrates the good solvent nature of water. These experimental findings indicate that polymer-polymer aggregation processes are not an inherent property of these systems. (C) 1999 American Institute of Physics. [S0021-9606(99)51302-0].