材料科学
电介质
纳米复合材料
聚合物
放松(心理学)
聚合物纳米复合材料
纳米颗粒
光谱学
图层(电子)
复合材料
化学工程
高分子化学
纳米技术
光电子学
工程类
物理
社会心理学
量子力学
心理学
作者
Bobby Carroll,Shiwang Cheng,Alexei P. Sokolov
出处
期刊:Macromolecules
[American Chemical Society]
日期:2017-08-02
卷期号:50 (16): 6149-6163
被引量:85
标识
DOI:10.1021/acs.macromol.7b00825
摘要
Probing the properties of the interfacial layer between the polymer matrix and nanoparticles in polymer nanocomposites (PNCs) remains a challenging task. Here, we apply three methods—a single Havriliak–Negami (HN) function fit, a two HN functions fit, and the heterogeneous model analysis (HMA)—to analyze the dielectric spectra of model poly(vinyl acetate)/SiO2 nanocomposites for the thickness and the average slowing down in dynamics of the interfacial layer. We find the HMA presents the most accurate analysis on both the thickness and dynamics of the interfacial layer, in comparison to the other two methods that have been actively applied in the field. In addition, the dielectric spectra at low temperatures reveal unexpectedly nonmonotonous changes in the secondary relaxation of the polymer with nanoparticle loadings. These results clearly demonstrate that dielectric spectroscopy is an easy and robust method to study a wide range of dynamic properties of the interfacial layer in PNCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI