Surface Modification of Carbon Nanotubes in Silicone–Polyurethane for Improved Mechanical and Anticorrosion Properties

Author:

Hao Guoqiang1,Li Xia1,Wang Shuchuan2,Wang Shirong2,Ryu Moonhee3,Yang Jingxia12ORCID

Affiliation:

1. College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, LongTeng Road 333, Shanghai 201620, China

2. T&H Chemicals Co., Ltd., Tangxi Industrial Zone, Quanzhou 362011, China

3. Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Republic of Korea

Abstract

Carbon nanotubes (CNT) were dispersed into homemade silicone–polyurethane (SPU) resin in order to enhance their mechanical and anticorrosion ability. Before mixing with SPU, CNT were modified by four different approaches to improve their dispersion in SPU, and the surface of CNT were covered by SiO2–TiO2 nanoparticles, -NH2 groups, epoxy groups or isocyanate groups, respectively. The structures of the modified CNTs were checked by XRD, FTIR, and SEM. After being dispersed in SPU to form a composite coating, the one with SiO2–TiO2 nanoparticles modified CNT exhibited the best mechanical properties and chemical resistance (low water absorption), and its corrosion current density (icorr) was only 9.246 × 10−9 A cm2, which is four orders of magnitude lower than the icorr value of the coating with unmodified CNT (1.599 × 10−5 A/cm2). This may be because the covered SiO2–TiO2 nanoparticle increased the roughness of the CNT surface, which can improve their dispersion in SPU resin.

Funder

Natural Science Foundation of Shanghai

Publisher

MDPI AG

Subject

Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces

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