Sanz Alejandro, Ezquerra Tiberio A, García-Gutiérrez Mari Cruz, Puente-Orench Inés, Campo Javier, Nogales Aurora
Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, 28006 Madrid, Spain.
Eur Phys J E Soft Matter. 2013 Mar;36(3):24. doi: 10.1140/epje/i2013-13024-1. Epub 2013 Mar 19.
One of the simplest ways to confine polymeric materials is by self-assembling during the crystallization process. The remaining amorphous phase is then constrained by the lamellar crystals. In this manuscript, we aim to shed additional light in the understanding of the amorphous chains dynamics of semicrystalline polymers above the Tg by using incoherent quasielastic neutron scattering QENS in a nanoscopic time scale (10(-9)-10(-10)s) on poly(ethylene terephthalate). The observed dynamics is satisfactorily described by a theoretical model that considers that the proton mobility follows a random jump-diffusion in a restricted environment. We demonstrate that the combination of macroscopic with nanoscopic dynamic tools allows a complete description of the confined dynamics on a paradigmatic semicrystalline polymer like poly(ethylene terephthalate).
限制聚合物材料的最简单方法之一是在结晶过程中通过自组装来实现。然后，剩余的非晶相被片晶所限制。在本论文中，我们旨在通过在纳米时间尺度（10^(-9)-10^(-10)s）上对聚对苯二甲酸乙二酯使用非相干准弹性中子散射（QENS），进一步深入了解半结晶聚合物在玻璃化转变温度（Tg）以上的非晶链动力学。通过一个理论模型可以令人满意地描述所观察到的动力学，该模型认为质子迁移率在受限环境中遵循随机跳跃扩散。我们证明，宏观动力学工具与纳米动力学工具的结合能够完整描述像聚对苯二甲酸乙二酯这样典型的半结晶聚合物的受限动力学。
