文献类型：期刊文献

英文题名：Distinct Viscoelasticity of Nanoparticle-Tethering Polymers Revealed by Nonequilibrium Molecular Dynamics Simulations

作者：Xu, Pengxiang[1];Lin, Jiaping[1];Zhang, Liangshun[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ,Shanghai Key Lab Advanced Polymer Mat, Key Lab Ultrafine Mat,State Key Lab Bioreactor Eng, Shanghai 200237, Peoples R China

年份：2017

卷号：121

期号：50

起止页码：28194

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20175004536627);WOS:【SCI-EXPANDED(收录号:WOS:000418784100043)】；

基金：This work was supported by National Natural Science Foundation of China (Nos. 21234002 and 21474029). Support from Projects of Shanghai municipality (Nos. 16520721900 and 14DZ2261205) and Fundamental Research Funds for the Central Universities (No. 222201717021) is also appreciated.

语种：英文

外文关键词：Molecular dynamics - Chain length - Organic polymers - Viscoelasticity

摘要：We employed nonequilibrium molecular dynamics simulations to study viscoelastic properties of nano particle-tethering polymers. Effects of nanoparticle-polymer interaction and molecular architecture on the viscoelasticity are investigated. The results show that the nanoparticle-tethering polymers with attractive nanoparticle-polymer interaction exhibit enhanced storage and loss moduli relative to the homopolymers or bare nanoparticle/polymer blend. In addition, the storage and loss moduli of nanoparticle-tethering polymers can be further enhanced through tuning their molecular architectures, such as increasing the nanoparticle diameter or decreasing the polymer chain length: From the physical origin, the enhancement of dynamic moduli originates from the slowdown of polymer dynamics, which arises from the attractive nanoparticle-polymer interaction, the tethering covalent bond, and the obstacle of nanoparticles. The present work not only reveals the physical origin of distinct viscoelasticity of nanoparticle-tethering polymers, but also provides useful information for preparing advanced materials based on these organic/inorganic components.