评论Justin E. Pye和Connie B. Roth，J. Polym.科学，Part B Polym.Phys. 2015，53，64-75
Comment on Justin E. Pye and Connie B. Roth, J. Polym. Sci., Part B Polym.Phys. 2015, 53, 64-75
摘要：
Pye和Roth（PR）用椭圆偏振法在独立的高分子量PS膜中发现了两个转变。PR分析表明，上、下相变均来自节段α-弛豫，上相变发生在90%的材料中。在本文中，我们使用自支撑膜的介电弛豫数据，以排除他们的建议。此外，我们通过实验证明，子劳斯模式耦合到密度，并响应于物理老化，以验证我们的解释，可以解释上跃迁。
英文摘要：
Two transitions were found by ellipsometry in freestanding high molecular weight PS films by Pye and Roth (PR). PR suggested that the upper and the lower transitions both came from the segmental a-relaxation, and the upper transition occurs in 90% of the material. In this paper we use dielectric relaxation data of freestanding films to rule out their suggestion. Furthermore, we demonstrate by experimental evidences that the sub-Rouse modes are coupled to density, and respond to physical aging to validate our interpretation and can explain the upper transition.
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