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Long-ranged relaxations in poly(ethylene oxide) melts: Evidence for network behavior

机译:聚环氧乙烷熔体的远距离弛豫:网络行为的证据

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Two slow, long-ranged relaxations in melts of poly(ethylene oxide) (PEO) were studied using the noninvasive dynamic light-scattering technique of photon correlation spectroscopy (PCS). Measurements were made for two PEO samples, one with a molecular weight distinctly above the entanglement value and a second sample with a molecular weight distinctly below the entanglement value. Based on several lines of evidence, it is concluded that the faster of these relaxations, which can be identified with the "cluster" or "Fischer" mode observed earlier in other homopolymer melts, results from the gel-like behavior of a physical network formed by the polymer in the melt, while larger-scale rearrangements in the polymer network structure are responsible for the slower relaxation. (C) 1998 American Institute of Physics. [S0021-9606(98)51848-X]. [References: 24]
机译:使用光子相关光谱法(PCS)的无创动态光散射技术研究了聚环氧乙烷(PEO)熔体中的两个缓慢的远距离弛豫。对两个PEO样品进行了测量,一个样品的分子量明显高于纠缠值,另一个样品的分子量明显低于纠缠值。根据几条证据,可以得出结论,这些弛豫速度更快,可以通过较早在其他均聚物熔体中观察到的“簇”或“费歇尔”模式来识别,这是由形成的物理网络的凝胶状行为导致的聚合物在熔体中的重排是由聚合物引起的,而聚合物网络结构中的大规模重排则是导致弛豫较慢的原因。 (C)1998美国物理研究所。 [S0021-9606(98)51848-X]。 [参考:24]

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