Revisiting Silica Networks by Small-angle Neutron Scattering and Synchrotron Radiation X-ray Imaging Techniques  

作　　者：Xin-Wei Kang Dong Liu Ping Zhang Ming Kang Feng Chen Qing-Xi Yuan Xiu-Li Zhao Ying-Ze Song Li-Xian Song 

机构地区：[1]State Key Laboratory of Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China [2]Key Laboratory of Neutron Physics,Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621999,China [3]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China

出　　处：《Chinese Journal of Polymer Science》2020年第9期1006-1014,I0008,共10页高分子科学（英文版）

基　　金：the National Natural Science Foundation of China(Nos.11605171 and 21973076);Sichuan Science and Technology Program(No.2018GZ0155);Ph.D program Foundation of SWUST(No.18ZX7112);Longshan Program for Talents(SWUST,No.I8 LZXT11);the Project of State Key Laboratory of Environment-Friendly Energy Materials(SWUST,No.19FKSY16).

摘　　要：The silicone rubber composites present remarkable mechanical properties due to the double network structure constructed with molecular network of matrix and filler network of silica.Nevertheless,the filler network structure and corresponding reinforcement mechanism are still under debate and need to be further probed with the aid of applicative advanced analysis techniques.Herein,small-angle neutron scattering(SANS)and synchrotron radiation X-ray nano-computed tomography(Nano-CT)techniques are employed to explore the evolution of filler networks of fumed,precipitated and sol-gel silica,respectively.Our studying results reveal the formation of filler network constructed by the interconnecting of branched silica aggregates.And the silica with highly associated structure,pertaining to amorphous morphology,small size,and large surface area,presents short distance and effective molecular chain bridge between aggregates,thus forming strong and steady filler networks.This work would provide deep-seated revisiting of filler networks and corresponding reinforcement mechanism and offer guidance for optimizing the mechanical properties of silicone rubber.

关 键 词：Silica networks Reinforcement mechanism SANS Nano-CT 

分 类 号：TQ333.93[化学工程—橡胶工业]