Nano-scratch test for POSS films based on vinyltrimethoxysilane and modified with titanium tetrabut

• 作 者: 陈平 胡立江 刘金成 崔津津
• 机 构: Chemstry Center, Harbin University of Commerce, Harbin 150076, China,Dept. of Applied Chemistry, Har
• 出 处: Journal of Harbin Institute of Technology
• 发表日期: 2005年02期
• 关键词: scratch titanium Aldrich files elasto friction mount plasticity needle

Polyhedral oligomeric Silsesquioxanes (POSS) derived from vinyltrimethoxysilane (VMS) and modified with titanium tetrabutoxide (TTBO) (PVT) were prepared by sol-gel process catalyzed by hydrochloric acid (molar ratio: [HCl]/Si=0.05), and heating at 45 ℃ during 3 days. The PVT films (f-PVT) with different TTBO content, 5, 20 and 25wt% TTBO, were prepared by adding the stoichiometric amount of benzoyl peroxide (BPO) to PVT solutions in ethanol, dip-coating over glass substrates, and curing using an appropriate thermal cycle and time. The hardness and elastic modulus of f-PVT were tested by continuous stiffness measurement (CSM) of nanoindentation, and the tribological behaviors were comparatively investigated with a nanoscratch test. The influence of the different TTBO contents on the mechanical properties of f-PVT was discussed. The scratch and friction coefficient profiles of f-PVT were illustrated. As the results of the test, f-PVT with 20% TTBO showed the better scratch resistance and tribological behavior.

Polyhedral oligomeric Silsesquioxanes (POSS) derived from vinyltrimethoxysilane (VMS) and modified with titanium tetrabutoxide (TTBO) (PVT) were prepared by sol-gel process catalyzed by hydrochloric acid (molar ratio: [HCl] /Si=0.05), and heating at The PVT films (f-PVT) with different TTBO content, 5, 20 and 25 wt% TTBO, were prepared by adding the stoichiometric amount of benzoyl peroxide (BPO) to PVT solutions in ethanol, dip- coating over The substrates of glass substrates, and curing using an appropriate thermal cycle and time. The hardness and elastic modulus of f-PVT were tested by continuous stiffness measurement (CSM) of nanoindentation, and the tribological behaviors were comparatively investigated with a nanoscratch test. The influence of the Different TTBO contents on the mechanical properties of f-PVT were discussed. The scratch and friction coefficient profiles of f-PVT were illustrated. As the results of the test, f- PVT with 20% TTBO showed the better scratch resistance and tribological behavior.