POSS/EPDM橡胶有机无机杂化材料热稳定性研究
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摘要
采用TG-DSC技术对梯形、八苯基、含磷、八乙烯基四种POSS在N_2和O_2两种气氛下及其POSS/EPDM在N_2气氛下的热稳定性进行了研究,结果表明:在N_2气氛下热稳定性按照梯形、八苯基、含磷和八乙烯基POSS顺序依次降低,但在O_2气氛下热稳定性则按照八乙烯基、梯形、含磷、八苯基POSS顺序依次降低;在N_2气氛下,与纯EPDM橡胶相比,梯形POSS/EPDM、含磷POSS/EPDM和八乙烯基POSS/EPDM的热稳定性显著提高且三者热稳定性基本相当,而八苯基POSS/EPDM则无明显变化;在N_2气氛下,与理论失重率相比,梯形POSS/EPDM失重率基本相当,而八苯基POSS/EPDM则显著提高,含磷POSS/EPDM和八乙烯基POSS/EPDM则显著降低,且后者表现更加明显。
The thermal stability of four kinds of POSS and POSS/EPDM under nitrogen and oxygen atmosphere were studied by TG-DSC technique. It was found that the thermal stability sequence under nitrogen atmosphere:ladder-shaped POSS>octaphenyl-POSS>phosphorus-containing POSS>octavinyl-POSS, but under oxygen atmosphere,the thermal stability sequence: octavinyl-POSS>ladder-shaped POSS>phosphorus-containing POSS> octaphenyl-POSS. Under nitrogen atmosphere, compared with EPDM, the thermal stabilities of three kinds of ladder-shaped POSS/EPDM,phosphorus-containing POSS/EPDM,octavinyl-POSS/EPDM were significantly improved and basically equal, but the thermal stability of octaphenyl-POSS/EPDM had no obvious change. Under nitrogen atmosphere, compared with theoretical weight loss rate, the weight loss rate of ladder-shaped POSS/EPDM was basically equal, the weight loss rate of octaphenyl-POSS/EPDM was obviously improved, the weight loss rates of phosphorus-containing POSS/EPDM and octavinyl-POSS/EPDM were significantly reduced, and the latter was more apparent.
The thermal stability of four kinds of POSS and POSS/EPDM under nitrogen and oxygen atmosphere were studied by TG-DSC technique. It was found that the thermal stability sequence under nitrogen atmosphere:ladder-shaped POSS>octaphenyl-POSS>phosphorus-containing POSS>octavinyl-POSS, but under oxygen atmosphere,the thermal stability sequence: octavinyl-POSS>ladder-shaped POSS>phosphorus-containing POSS> octaphenyl-POSS. Under nitrogen atmosphere, compared with EPDM, the thermal stabilities of three kinds of ladder-shaped POSS/EPDM,phosphorus-containing POSS/EPDM,octavinyl-POSS/EPDM were significantly improved and basically equal, but the thermal stability of octaphenyl-POSS/EPDM had no obvious change. Under nitrogen atmosphere, compared with theoretical weight loss rate, the weight loss rate of ladder-shaped POSS/EPDM was basically equal, the weight loss rate of octaphenyl-POSS/EPDM was obviously improved, the weight loss rates of phosphorus-containing POSS/EPDM and octavinyl-POSS/EPDM were significantly reduced, and the latter was more apparent.
引文
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[2]Baney R H,Itoh M,Sakakibara A,et al.Silsesquioxanes[J].Chemical Reviews,1995,95(5):1409-1430.
[3]张增平,裴建中,梁国正.POSS/聚合物有机-无机杂化材料的研究进展[J].中国胶粘剂,2012(8):49-53.
[4]高钧驰,杨荣杰.POSS/EPDM无机-有机杂化材料[J].复合材料学报,2011,28(1):68-71.
[5]刘萝威.火箭烧蚀绝热纳米复合材料研制进展[C].中国航天第三专业信息网第27届年会:249-254.
[6]闫大庆,徐丹丹.国外固体火箭技术的近期进展[J].中国航天,2009(7):32-37.