Thermal behaviour and mechanical properties of novel RTV silicone rubbers using divinyl-hexa[(trimethoxysilyl)ethyl]-POSS as cross-linker

被引:102
作者
Chen, Dongzhi [1 ]
Nie, Jiaorong [2 ]
Yi, Shengping [1 ,3 ]
Wu, Weibing [1 ]
Zhong, Yalan [1 ]
Liao, Jun [3 ]
Huang, Chi [1 ,3 ]
机构
[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
[2] CSSG, Jianghe Chem Factoty, Yuanan 444200, Peoples R China
[3] Minist Educ China, Engn Res Ctr Organosilicon Compound & Mat, Wuhan 430072, Peoples R China
关键词
Vinyl-POSS derivative; Divinyl-hexa [(trimethoxysilyl)ethyl]-POSS; RTV silicone rubber; Thermal degradation; Mechanical property; POLYHEDRAL OLIGOMERIC SILSESQUIOXANE; DEGRADATION; POSS; STABILITY; GC;
D O I
10.1016/j.polymdegradstab.2009.12.002
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Divinyl-hexal(trimethoxysilyl)ethyl]-POSS (DVPS) as an octavinyl-POSS derivative was first prepared. A series of novel polydimethylsiloxane (PDMS)/DVPS hybrid materials as room temperature vulcanized (RTV) silicone rubber were prepared. The chemical incorporation of novel POSS into hydroxyl-terminated PDMS system by hydrolytic condensation reaction was verified by attenuated total reflection (ATR) infrared spectroscopy. Thermal degradation, thermo-oxidative stability and mechanical properties of these novel RTV silicone rubbers were studied by means of thermogravimetric analysis and tensile testing. The results exhibited significantly enhanced effects on the thermal stabilities and mechanical properties as compared to the PDMS polymer prepared with tetraethoxysilane (TEOS). The observed improvements in thermal properties could be attributed to the effective three-dimensional network structures resulting from the structure of DVPS. The thermal decomposition of the RTV silicone rubbers in nitrogen was also monitored by TGA coupled with real-time FTIR, and the degradation residues were also characterized by FTIR. It was found that the POSS cross-linker facilitated the formation of cross-links in the degradation residues. The striking improvement in mechanical Properties could be attributed to the synergistic action of the structure of three-dimensional multi-arm cross-linker (vinyl-POSS derivative), the plasticization of self-cross-linking Vinyl-POSS derivative and perfect distribution of vinyl-POSS derivative. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:618 / 626
页数:9
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