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Cure Kinetics of Silicone/Halloysite Nanotube Composites
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2020-05-08 , DOI: 10.1002/vnl.21769
Zohre Karami 1 , Omid Moini Jazani 1 , Amir H. Navarchian 1 , Mohammad Reza Saeb 2
Affiliation  

Properties of silicone thin films and coatings are strongly hooked on curing reaction. We discussed about cure process of silicone nanocomposites containing halloysite nanotube (HNT) at different loading levels (0.5, 1.0, and 2.0 phr), both qualitatively and quantitatively. Systems containing pristine and aminosilane‐functionalized HNT were cured nonisothermally and heat buildup of the reaction was recorded by differential scanning calorimetry (DSC) in terms of the time and the temperature varying the heating rate. Integral and differential isoconversional methods suggested that apparent activation energy (Ea) was strongly affected by the loading level and surface treatment of HNT. The exponent of the autocatalytic reaction (m) was decreased by the introduction and increasing the amount of pristine, and more remarkably the functionalized HNT to the silicone, where the Friedman method suggested 0.249, 0.119, and 0.045 values of m for the neat silicone rubber, and the nanocomposites containing 1 phr of pristine and functionalized HNT, respectively. The logarithm of frequency factor, ln A was also increased due to the enhanced collisions between curing moieties in the presence of pristine and functionalized HNTs form 23.57 seconds for silicone rubber to 24.25 seconds and 25.19 seconds for silicone nanocomposite containing 2 phr of pristine and functionalized HNT, respectively. The theoretical rate of reaction was in agreement with experimental data.

中文翻译:

有机硅/铝硅酸盐纳米管复合材料的固化动力学

有机硅薄膜和涂料的性能与固化反应密切相关。我们讨论了定性和定量地研究了在不同负载量(0.5、1.0和2.0 phr)下含有埃洛石纳米管(HNT)的有机硅纳米复合材料的固化过程。包含原始和氨基硅烷官能化的HNT的系统非等温固化,并通过差示扫描量热法(DSC)根据时间和温度变化的加热速率记录反应的热量累积。积分和差分等转换方法表明,表观活化能(E a)受HNT的负载量和表面处理的强烈影响。自催化反应的指数(m)的减少是通过引入和增加原始胶的量和增加硅酮的功能化HNT来实现的,其中Friedman方法建议纯硅橡胶的m值为0.249、0.119和0.045 ,而含有1 phr的纳米复合材料的纳米复合材料原始和功能化的HNT,分别。频率因数对数ln的对数也增加了,是由于在原始存在下固化部分之间的碰撞增强,而功能化的HNT从硅橡胶的23.57秒增加到包含2 phr的原始和功能化的HNT的有机硅纳米复合材料的24.25秒和25.19秒。 , 分别。理论反应速率与实验数据一致。
更新日期:2020-05-08
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