Interplay between local dynamics and mechanical reinforcement in glassy polymer nanocomposites

被引：32

作者：

Holt, Adam P. ^{[1
,6
]}

Bocharova, Vera ^{[2
]}

Cheng, Shiwang ^{[2
]}

Kisliuk, Alexander M. ^{[2
]}

Ehlers, Georg ^{[3
]}

Mamontov, Eugene ^{[4
]}

Novikov, Vladimir N. ^{[5
]}

Sokolov, Alexei P. ^{[1
,2
,5
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[4] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA

[5] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

[6] Naval Res Lab, Div Chem, Code 6100, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW MATERIALS | 2017年 / 1卷 / 06期

关键词：

RUBBER-SILICA NANOCOMPOSITES; DIELECTRIC-SPECTROSCOPY; MOLECULAR-WEIGHT; RELAXATION; FILMS; POLYCARBONATE; TEMPERATURE; MODEL; TRANSITION; BEHAVIOR;

D O I：

10.1103/PhysRevMaterials.1.062601

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The modification of polymer dynamics in the presence of strongly interacting nanoparticles has been shown to significantly change themacroscopic properties above the glass transition temperature of polymer nanocomposites (PNCs). However, much less attention has been paid to changes in the dynamics of glassy PNCs. Analysis of neutron and light scattering data presented herein reveals a surprising enhancement of local dynamics, e.g., fast picosecond and secondary relaxations, in glassy PNCs accompanied with a strengthening of mechanical modulus. We ascribe this counter-intuitive behavior to the complex interplay between chain packing and stretching within the interfacial layer formed at the polymer-nanoparticle interface.

引用

页数：6

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