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POLYMER DEGRADATION AND STABILITY · 2018 · IF 3.193

Boron particles acting as antioxidants for fluorosilicone rubber due to their radical scavenging activity

Anna Zheng,Yongkang Huang,Yang You,Jian Hu,Dafu Wei,Xiang Xu,Yong Guan

The heat resistance enhancement of fluorosilicone rubber (FSR) can make it more suitable for cutting-edge applications and extreme conditions. This paper focused on the antioxidant properties of boron particles for FSR and the corresponding mechanism. The thermal stability of FSR and FSR/boron composites was characterized by thermal gravimetric analysis (TGA), isothermal degradation and thermal-oxidative ageing. The results showed that boron significantly improved the thermal stability of FSR. In particular, the FSR/boron (100/10) composite retained 95% of its weight after isothermal degradation at 350 °C for 12 h, while the FSR lost 55% of its weight within the initial 1 h. The antioxidant mechanism of boron was further investigated by chemiluminescence (CL), electron paramagnetic resonance (EPR) and vulcanization curves. It was shown that boron has powerful radical scavenging activity (RSA) and inhibited the oxidation scission of the side groups. Moreover, boron revealed no RSA towards the tert-butoxy radical, ensuring the good vulcanization of the FSR/boron composites.

研究领域: 高分子材料科学 · 橡胶化学 · 功能复合材料 · 热稳定性能 · 抗氧化机制

✓ 已验证 DOI 高影响因子

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JOURNAL OF APPLIED POLYMER SCIENCE · 2019 ·Vol. 136 ·期 45 ·48187 · IF 2.188

Application of waste silicon rubber composite treated by N2 plasma in the flame-retardant polypropylene

Yan Zhang,Shili He,Jianing Wu,Junjie Ma,Shengdong Shao,Lingjie He,Xiaonan Li,Zhengping Fang,Hongwei Cao,Zhichao Xi

The waste silicon rubber composite insulator (WSiRC) was applied along with ammonium polyphosphate (APP) and pentaerythritol (PER) to improve the flame retardancy of polypropylene (PP) in this study. Considering the compatibility among PP, WSiRC, and flame-retardant additives, WSiRC was treated by acid and N 2 plasma to obtain the plasma-treated WSiRC (PLSiR), which decreases the amount of the inorganic additive and grafts amino groups onto the surface of the silicon rubber. The infrared spectrocopy (IR), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA) confirm that NH 2 groups have been grafted onto the surface of PLSiR. The TGA data also show that PLSiR had the char improving ability and promote the crosslink of APP, which results in its promotion for the flame retartancy of PP proved by the data of limiting oxygen index (LOI), UL94 rating and cone tests. It is also showed that PLSiR is superior than the WSiRC treated only by acid (ASiR) due to the differences in the structure and polarity. Moreover, the improvement of PLSiR on the flame retardancy of PP is dependent on its amounts. It is indicated that the 1 wt % loading of PLSiR in PP with APP and PER has the highest LOI value of 30.9 and reached UL94 rating V-0. The peak heat release rate (pHRR) and total heat release (THR) values are also decreased by 68.7 and 15%, respectively. SEM and Raman results show the condensed mechanism is ascribed to the PP/APP-PER/PLSiR system because the quality of char affect the flame retardancy of PP. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48187.

研究领域: 高分子材料科学 · 阻燃化学 · 材料表面改性 · 环境功能材料 · 废弃资源再利用

✓ 已验证 DOI 高影响因子

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Boron particles acting as antioxidants for fluorosilicone rubber due to their radical scavenging activity

Application of waste silicon rubber composite treated by N2 plasma in the flame-retardant polypropylene