Journal
POLYMERS
Volume 10, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/polym10050520
Keywords
silicone rubber; zirconium-containing; polyhedral oligometallasilsesquioxane; thermal-oxidative stability; free-radical quenching
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Funding
- National Natural Science Foundation of China [51773064, 51403067, 51573052]
- Science and Technology Planning Project of Guangdong Province [2015B090925014]
- Natural Science Foundation of Guangdong Province [2017A030313303]
- Pearl River S&T Nova Program of Guangzhou [201710010062]
- Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation [pdjh2017a0028]
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Free radicals play a negative role during the thermal degradation of silicone rubber (SR). Quenching free radicals is proposed to be an efficient way to improve the thermal-oxidative stability of SR. In this work, a novel zirconium-containing polyhedral oligometallasilsesquioxane (Zr-POSS) with free-radical quenching capability was synthesized and characterized. The incorporation of Zr-POSS effectively improved the thermal-oxidative stability of SR. The T-5 (temperature at 5% weight loss) of SR/Zr-POSS significantly increased by 31.7 degrees C when compared to the unmodified SR. Notably, after aging 12 h at 280 degrees C, SR/Zr-POSS was still retaining about 65%, 60%, 75%, and 100% of the tensile strength, tear strength, elongation at break, and hardness before aging, respectively, while the mechanical properties of the unmodified SR were significantly decreased. The possible mechanism of Zr-POSS for improving the thermal-oxidative stability of SR was intensively studied and it was revealed that the POSS structure could act as a limiting point to suppress the random scission reaction of backbone. Furthermore, Zr could quench the free radicals by its empty orbital and transformation of valence states. Therefore, it effectively suppressed the thermal-oxidative degradation and crosslinking reaction of the side chains.
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