mPE/mPE-g-silane/clay 水交聯奈米複合材料之製備及機械性質研究

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题名:	mPE/mPE-g-silane/clay 水交聯奈米複合材料之製備及機械性質研究
作者:	唐士賢
贡献者:	材料科學與奈米科技研究所
关键词:	茂金屬聚乙烯辛烯黏土矽烷水交聯機械性質奈米複合材料
日期:	2008
上传时间:	2010-06-29 13:59:43 (UTC+8)
摘要:	本研究從事mPE/mPE-g-silane/clay奈米複合材料之製備，使用DCP (Dicumyl peroxide)為起始劑，DBTL (Dibutyin Dilaurate)作為催化劑，VTEOS (Vinyl Triethoxy Silane)當交聯劑，使用的mPE為Dow的EG系列(EG 8003)，製備mPE-g-silane為相容劑，在混煉機中先進行mPE接枝矽烷交聯劑，再和mPE/clay掺混，最後熱壓成薄片，以70℃水浴進行水交聯。實驗中採用兩種不同的黏土不同的比例做比較，使用的黏土分別為Cloisite® 20A和Cloisite® 30B。經由傅立葉轉換紅外線光譜儀(FT-IR)分析結果確定silane確實接枝於mPE上且具有交聯的能力。經凝膠量測試結果得知，所添加的相容劑確實有與黏土產生反應；但mPE/mPE-g-silane/clay 30B系統出現相容劑不足的現象。經X光繞射分析(XRD)測試發現，添加mPE-g-silane確實有達到提升分散黏土的效果，且mPE/mPE-g-silane/clay 20A系統擁有較好的分散程度，形成插層型的奈米複合材料，而mPE/mPE-g-silane/clay 30B系統仍呈現傳統型複合材料的型態。經穿透式電子顯微鏡(TEM)發現其結果與XRD的結果相呼應，mPE/mPE-g-silane/clay 20A系統出現絲狀的黏土結構，而mPE/mPE-g-silane/clay 30B皆呈現大型顆粒存在。由示差掃描熱卡計(DSC)得知，添加相容劑和黏土對其Tm無明顯影響。而Tc則是mPE/mPE-g-silane/clay 20A系統略高於mPE/mPE-g-silane/clay 30B系統。經熱種分析儀(TGA)顯示，添加黏土後對材料熱裂解溫度有大幅的提升，且添加clay 20A系統的熱裂解溫度皆高於添加mPE/mPE-g-silane/clay 30A系統。DMA測試發現，隨黏土的含量增加室溫下的儲存模數隨之上升。由抗張測試可發現，mPE/mPE-g-silane/clay 20A系統隨著黏土的含量增加楊氏係數有上升的趨勢，而mPE/mPE-g-silane/clay 30B系統隨著黏土的含量增加楊氏係數沒有改變。由撕裂測試可發現，隨著黏土的添加量增加，撕裂強度也隨著增加，且clay 20A的系統增加較為明顯。 Metallocene polyethylene-octene elastomer (mPE)/clay nanocomposites are obtained and studied by using a mPE-g-silane as a compatibilizer. Metallocene polyethylene was grafted with vinyl triethoxy silane first and then followed by the mixing of which with mPE and clay. The crosslinking reaction was conducted in water at 70℃. Two different clays, chemically modified clay Closite 20A and clay Closite 30B, have been used. By the results of FT-IR, we have confirmed the silane was essentially grafed. Through the gel content measurement, we know the compatibilizer reacted with clay, but the system of mPE/mPE-g-silane/clay 30B is short about the contents of compatibilizer. The XRD testing revealed that increasing the contents of mPE-g-silane would increase the dispersion of clay, and mPE/mPE-g-silane/clay 20A intercalated nanocomposites have a dispersion better than mPE/mPE-g-silane/clay 30B intercalated nanocomposites. Transmission Electron Microscope (TEM) revealed the results agreed with XRD analysis. In the system of mPE/mPE-g-silane/clay 20A, the structure of clay became like threads and the structure of clay of mPE/mPE-g-silane/clay 30B existed as big particles. The DSC testing revealed that the melting temperature was not obviously changed when increasing the contents of clay and compatibilizer, but the temperature of critical , the system of mPE/mPE-g-silane/clay 20A is a little bit higher than the system of mPE/mPE-g-silane/clay 30B. Through the results of TGA analysis, the decomposition temperature was obviously increased when increasing the contents of clay, and clay 20A is much higher than clay 30B. DMA testing showed the storage modulus in the room temperature was increased with increasing the clay contents. Through tensile test, Young’s modulus was increased as clay 20A contents increased, but clay 30B was not. This was attributed to the high surface area between the mPE and the clay 20A. Through tear test, the tear strength was obviously increased when increasing the contents of clay, and clay 20A system is much higher than clay 30B system.
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