| 摘要: | 本研究使用混煉機(Mixer)以熔融方法將mPE (Metallocene Polyethylene)為基材，以DCP (Dicumyl Peroxide)為接枝起始劑、DBTL (Dibutyltin Dilaurate)為交聯催化劑，先在mPE上接枝矽烷VTEOS (Vinyl Triethoxy Silane)後掺入clay，熱壓成片後以70℃水浴進行水交聯以製備mPE-g-silane/clay高分子奈米複合材料。奈米複合材料掺入比例以mPE為100 phr, silane為0.5、1.5、2.5、3.5 phr, clay為2、5、9 phr，觀察不同添加不同silane及clay比例時對材料熱性質,微觀構造及機械性質的影響。
經X光繞射分析(X-RD)發現當silane濃度上升各系統複合材料內的clay的層間距也隨之增加，形成插層型奈米複合材料，其分散效果以接枝silane 3.5 phr為最佳。而經由穿透式電子顯微鏡(TEM)也證實了與XRD的結果相符合。傅立葉轉換紅外線光譜儀(FT-IR)分析結果顯示silane確實的接枝於mPE。經凝膠量測試結果顯示當clay含量增加其凝膠量隨之下降。由示差掃瞄熱卡計(DSC)分析顯示clay的含量增減對其複合材料的Tm、Tc無明顯之影響。經熱重分析儀(TGA)顯示添加clay皆能提升其5 wt %重量損失溫度、50 wt %重量損失溫度、（Tmax）。mPE-g-silane 3.5 phr/clay系統內5 wt %、50 wt %重量損失溫度及Tmax皆以clay 2 phr為最高。由撕裂測試發現mPE-g-silane 3.5 phr/clay(交聯後)系統其撕裂強度皆隨著clay含量上升而有著近乎5倍增強。未進行接枝反應的系統下，無論交聯與否其撕裂強度皆低於mPE /clay系統。改變布間距做撕裂測試，發現在clay 0 phr的系統中，布間距不影響其撕裂強度。而在clay 2 phr及clay 9 phr系統中發現布間距在1mm以上對其撕裂強度影響不大，而布間距在1mm以下則有下降之趨勢。
Metallocene polyethylene (mPE) grafted with sliane / clay nanocomposite were prepared by melt intercalation method using a mixer. The metallocene polyethylenes were grafted with vinyltriethoxy silane. The crosslinking reaction is conducted at 70°C in the presence of water.
X-ray Diffraction (XRD) revealed that the d-spacing of clay platelets increased after crosslinking intercalated nanocomposite. The metallocene polyethylenes were grafted with silane could further increase the dispersion of clay platelets and further expanded its spacing. Transmission Electron Microscope (TEM) revealed that the result agreed with that from XRD Analysis. The thermal resistance was increased in the presence of clay. The improvement in the thermal decomposition temperature at 5 % 、50% weight loss and degraded temperature of clay 2 phr was the highest. The tear strength of mPE-g-silane/clay increase up to 5-fold with clay dispersion. On the other hand tear strength decreased without silane treatment and crosslinking of mPE/clay. The tear strength varying with cloth spacing was increased in the presence of clay. Increasing the cloth spacing beyond 1mm, the tear strength appeared to level off. |
