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Chemically functionalized SiO 2 to improve mechanical properties of oil‐impregnated monomer casting nylon
Author(s) -
Wang Qin,
Zhang Qian,
Wang Fan,
Zhao Yanwen,
Wang Yuexin
Publication year - 2019
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.46994
Subject(s) - materials science , composite material , flexural strength , ultimate tensile strength , thermogravimetric analysis , flexural modulus , izod impact strength test , nylon 66 , nylon 6 , dynamic mechanical analysis , composite number , thermal stability , casting , young's modulus , dispersion (optics) , polymer , chemical engineering , polyamide , physics , optics , engineering
Toluene‐2,4‐diisocyanate and dodecanol were used to chemically functionalize nanosilica (TDID‐SiO 2 ). Composites of TDID‐SiO 2 and oil‐impregnated monomer casting nylon (OMC nylon) were prepared by an in situ anionic ring‐opening polymerization. The dispersion of the TDID‐SiO 2 in oil was studied along with the mechanical and friction properties of the composites. The results show that the dispersion of the TDID‐SiO 2 in oil was significantly enhanced. Specifically, some TDID‐SiO 2 was wrapped in oil droplets, and the size of the oil droplets increased from 2.3 to 3.3 μm for 0–0.125 wt % of the TDID‐SiO 2 nanoparticles, which was confirmed by scanning electron microscopy. The composites exhibited excellent mechanical properties when 0.10 wt % TDID‐SiO 2 was integrated into OMC nylon. The tensile strength, elastic modulus, notched impact strength, flexural strength, and flexural modulus increased by 6.9%, 7.1%, 33.2%, 15%, and 77.5%, respectively, compared to OMC nylon without TDID‐SiO 2 nanoparticles. The friction coefficient was effectively controlled and the abrasion quantity was reduced. Thermogravimetric analysis showed that the thermal decomposition temperature was also improved. The improved mechanical and frictional properties of TDID‐SiO 2 /OMC nylon composite will enhance its application in wear‐resistant products in heavy industry. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 46994.