Thermal aging properties of flame retardant silicone rubber based on melamine cyanurate,Journal of Applied Polymer Science

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Thermal aging properties of flame retardant silicone rubber based on melamine cyanurate
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-16 , DOI: 10.1002/app.49919
Cheng Zhou _{1,

2} , Juan Wang ₃ , Jianxi Li _{1,

2} , Jie Shi ₄

Affiliation

In this work, an efficient preparation method for flame retardant silicon rubbers (FRSR) was established with using melamine cyanurate (MCA) as flame retardants. In order to analyze the thermal aging mechanisms and flame retardancy of FRSR, cone calorimetric test (CCT), Fourier transform infrared (FTIR) spectra, scanning electronic microscopy (SEM), and energy dispersive X‐ray spectra were performed. Results indicated that the aging time significantly decreases the tensile strength and the elongation at break. SEM images revealed that the porous surface of the aged FRSR provide diffusion path for heat and oxygen, which resulted in a continuously increase in Shore A hardness due to the increase of cross‐linking density during the aging process. FTIR spectra further proved that the MCA is well‐embedded into samples and cross‐linking reaction between free radicals of silicone rubber (SR) and oxygen was occurring during the aging process. Besides, CCT results showed that all FRSR samples before and after thermal aging exhibit excellent flame retardancy with compact and stable char residue layers, effectively hindering the heat transfer and oxygen diffusion. It was expected that our findings could provide important information to fabricate SR with flame retardancy and outstanding long‐term thermal‐aging resistance.

中文翻译：

基于三聚氰胺氰尿酸酯的阻燃硅橡胶的热老化性能

在这项工作中，建立了以三聚氰胺氰尿酸酯（MCA）为阻燃剂的阻燃硅橡胶（FRSR）的有效制备方法。为了分析FRSR的热老化机理和阻燃性，进行了锥形量热测试（CCT），傅立叶变换红外（FTIR）光谱，扫描电子显微镜（SEM）和能量色散X射线光谱。结果表明，时效时间显着降低了拉伸强度和断裂伸长率。SEM图像显示，老化的FRSR的多孔表面提供了热量和氧气的扩散路径，由于老化过程中交联密度的增加，导致邵氏A硬度不断提高。FTIR光谱进一步证明了MCA已很好地嵌入样品中，并且在老化过程中发生了硅橡胶（SR）的自由基与氧之间的交联反应。此外，CCT结果表明，热老化前后的所有FRSR样品均具有优异的阻燃性，并具有紧密而稳定的炭渣层，有效地阻碍了热传递和氧扩散。可以预期，我们的发现可以为制造具有阻燃性和出色的长期抗热老化性的SR提供重要信息。有效地阻碍了热传递和氧气扩散。可以预期，我们的发现可以为制造具有阻燃性和出色的长期抗热老化性的SR提供重要信息。有效地阻碍了热传递和氧气扩散。可以预期，我们的发现可以为制造具有阻燃性和出色的长期抗热老化性的SR提供重要信息。

更新日期：2020-11-25

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