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Interface of polyimide–silica grafted with different silane coupling agents: Molecular dynamic simulation
Author(s) -
Zhao Yuanliang,
Qi Xiaowen,
Ma Jian,
Song Laizhou,
Yang Yulin,
Yang Qingxiang
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.45725
Subject(s) - polyimide , materials science , silane , membrane , molecule , chemical engineering , polymer chemistry , surface modification , layer (electronics) , monolayer , oxide , composite material , nanotechnology , organic chemistry , chemistry , biochemistry , engineering , metallurgy
In this article, the effects of different silane coupling agents: 3‐glycidyloxypropyltrimethoxysilane (GOTMS), 3‐aminopropyltriethoxysilane (APTES), and 3‐methacryloxypropyltrimethoxysilane (MPTS), on the interface between polyimide (PI) and silica (SiO 2 ), were investigated using molecular dynamic simulation. The results indicate that binding energy between PI molecules and SiO 2 surface mainly comes from van der Waals interaction. Proper silane coupling agents generate a thin membrane on the surface of SiO 2 , which improves the thickness of the transition layer between PI molecules and SiO 2 surface. And density of the transition layer was enhanced by APTES significantly. In addition, amino group (NH 2 ) improves the electrostatic interaction between PI molecules and SiO 2 surface rather than epoxy group (CHCH 2 O) and methacrylic oxide group (OCOC(CH 3 )CH 2 ). As a result, APTES enhances the binding energy effectively. However, excessive silane coupling agent increases the distance between PI matrices and SiO 2 , which deteriorates performance of the interface. In addition, GOTMS and MPTS generate a thick and dense membrane on SiO 2 surface, which induces the loose transition layer and poor binding energy. Overlap parameter between PI molecules and SiO 2 surface grafted with silane coupling agent can be employed to evaluate the transition layer successfully. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45725.