“Nanocompoundsite”:Nano phased polymer dispersed in inorganic matrix via covalent bonds  

作　　者：Xiang Guo Pengfei Li Guoming Liu Ye Tian Zongbo Zhang Caihong Xu Lei Jiang 

机构地区：[1]CAS Key Laboratory of Science and Technology on High-tech Polymer Materials,Institute of Chemistry,Chinese Academy of Sciences(ICCAS),Beijing 100190,China [2]University of Chinese Academy of Sciences(UCAS),Beijing 100049,China [3]CAS Key Laboratory of Engineering Plastics,Institute of Chemistry,Chinese Academy of Sciences(ICCAS),Beijing 100190,China [4]Key Laboratory of Bio-inspired Materials and Interfacial Science,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences(TIPCCAS),Beijing 100190,China [5]Research Institute for Frontier Science,Beihang University,Beijing 100191,China

出　　处：《Nano Research》2022年第7期6582-6589,共8页纳米研究（英文版）

基　　金：The authors are grateful for the financial support from the Youth Innovation Promotion Association Chinese Academy of Sciences(CAS)and the National Natural Science Foundation of China(No.21922308).

摘　　要：Herein we demonstrate a new strategy to construct inorganic–organic“nanocompoundsite”,i.e.,a material that nano phased polymer is dispersed in consecutive inorganic matrix via covalent bonds,which is different from the conventional nanocomposite with polymer as matrix and inorganic nanomaterials as dispersed phase.As a representative system,SiOx/polydimethylsiloxane(PDMS)nanocompoundsite was prepared from a polymeric precursor of perhydropolysilazane(PHPS)modified by carbohydroxyl end-capped PDMS(HOC-PDMS),through a room-temperature vacuum ultraviolet(VUV)irradiation manner.By adjusting HOC-PDMS/PHPS ratio below 20%,PDMS fully binds to the PHPS derived SiOx matrix via Si-O-C bond to form the inorganic-organic SiOx/PDMS nanocompoundsite(ISPN)without noticeable phase separation.The introduction of PDMS into ISPN renders its initial decomposition temperature increase over 110℃.The remarkable enhancement of thermal stability for PDMS is due to the restriction of terminal hydroxyl induced back-biting reaction and main chain degradation by the inorganic matrix and the covalent binding between PDMS and SiOx.This novel strategy can further extend to hydroxyl terminated PDMS,polyethylene glycol,and acrylic resin,with the initial decomposition temperature of each polymer increasing by over 110,150 and 100℃,respectively.More importantly,the nanocompoundsite combines the characteristics of inorganic matrix and polymer.The coating based on SiOx/PDMS nanocompoundsite exhibits good flexibility,outstanding interfacial binding strength,ultra-high hardness as well as excellent hydrophobicity.

关 键 词：NANOCOMPOSITE nanocompoundsite INORGANIC-ORGANIC molecular-level confinement thermal stability 

分 类 号：TB3[一般工业技术—材料科学与工程]