State of cure in silicone/clay nanocomposite coatings: The puzzle and the solution

被引：39
作者：
Karami, Zohre [1 ]
Jazani, Omid Moini [1 ]
Navarchian, Amir H. [1 ]
Saeb, Mohammad Reza [2 ]
机构：
[1] Univ Isfahan, Fac Engn, Dept Chem Engn, POB 81746-73441, Esfahan, Iran
[2] Inst Color Sci & Technol, Dept Resin & Addit, POB 16765-654, Tehran, Iran
来源：
PROGRESS IN ORGANIC COATINGS | 2018年 / 125卷
关键词：
Silicone; Nanoclay; Crosslinking; Differential scanning calorimetry; Silane functionalization; DYNAMIC-MECHANICAL PROPERTIES; STYRENE-BUTADIENE RUBBER; SILICA NANOPARTICLES; CLAY NANOCOMPOSITES; MORPHOLOGY; COMPOSITES; KINETICS; ORGANOCLAYS; SILYLATION; FE3O4;
D O I：
10.1016/j.porgcoat.2018.09.019
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Properties of a rubber/clay nanocomposite coating depend on rubber network formed in the presence of clay platelets. Not surprisingly, however, a few is known about the state of cure in silicone nanocomposites. In this work, nanoclay flakes are modified with trifunctional silane, fully characterized, and then added to silicone coatings. The resulting nanocomposites are underwent nonisothermal differential scanning calorimetry (DSC) varying heating regime. Fourier-transform infrared spectrophotometry, X-ray diffractometry, and thermo-gravimetric analysis (TGA) techniques were employed to quantify grafting reaction efficiency and thermal stability of modified nanoclay. Cure characteristics of nanocomposites (exothermal peak temperature as well as cure enthalpy) containing pristine and silane-modified nanoclays were discussed in terms of clay content under different DSC heating rates. The mysterious state of cure in silicone/clay nanocomposite coatings was unraveled and then explained by solving curing puzzle for silicone/clay systems through comparison between newly defined T* and Delta H* dimensionless indexes dedicated to the crosslinked nanocomposite networks with respect to blank silicone coating. The progressive/diffusional crosslinking and complete/partial/imperfect curing were respectively evaluated by analyzing fluctuations in T* and Delta H* values, where the effects of clay content and surface chemistry were satisfactorily quantified.
引用
收藏
页码：222 / 233
页数：12
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