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  • 學位論文

以溶液聚合法製備有機黏土/聚胺酯奈米 複合材料之研究

The Study of Organoclay/ Polyurethane Nanocomposites Prepared by Solution Polymerization

指導教授 : 王賢達
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摘要


本研究以溶液聚合法來製備有機黏土/聚胺酯奈米複合材料。將市售之有機黏土(Cloisite30B)溶於二甲基乙醯胺(DMAc)膨潤48小時後,高速離心(7000rpm),取其無懸浮之澄清黏土溶液,和聚胺酯前驅物反應至接近要形成凝膠後加入1,4-丁二醇(1,4-butanediol)作為鏈延長劑而得其產物。 由1H-NMR量測,可發現在有機黏土/聚胺酯奈米複合材料光譜中也有著Cloisite30B的1.24 ppm、0.84ppm之有機改質劑特性峰。使用A.A.更進ㄧ步的確認有機蒙脫土中鋁元素的含量,得知Cloisite30B於聚胺酯中的飽和含量約為5.7%重量百分比。 GPC的測試中可發現在黏土添加量達到2.5%左右,即使再添加更多的黏土也無法使分子鏈增長。在FTIR測試中,也發現添加較多量有機黏土,會因黏土本身的立體障礙而阻擋了硬鏈間的氫鍵結,使材料整體氫鍵數目降低。對於材料的強力而言亦是如此,適當的增加聚胺酯中的黏土量,材料的延伸性及強力皆能有所增加,較多量黏土則會使材料的延伸性下降。阻水氣性試驗方面,添加了有機黏土之聚胺酯皆因黏土本身優秀的阻水氣性而有所改善。抗凝血性質方面,則是由於蒙脫土本身矽酸鹽有親水性的作用,使聚胺酯的的表面更具親水性質,使其在抗凝血性方面比純聚胺酯更為優秀。在黏土的分散性方面,利用TEM得知黏土是以插層近剝層的狀態分散於聚胺酯上。但由TGA得知有機黏土Cloisite30B的添加對於聚胺酯熱穩定性的提升效果並不明顯。

並列摘要


In this research the organoclay / polyurethane nanocomposite has been prepared using solution polymerization. The organoclay (Cloisite30B) obtained from commercial source has been soaked in dimethyl acetamide for 48 hours, and this solution was centrifuged at 7000 rpm in order to remove suspended clay. The clear solution of the above reacted with polymer precursor until the reaction was close to gelation. The modified polyurethane(PU) has been obtained by chain-extending above prepolymer with 1,4-butanediol. 1H-NMR spectra displayed characteristic signals at 0.84 and 1.24 ppm representing organoclay of PU nanocomposites. The atomic absorption spectroscopy also indicated the existence of aluminum which belongs to organoclay , and 5.7 wt% organoclay for PU samples is maximum. The number average molecular weight obtained from gel permeation chromatography reached plateau value for PU sample containing about 2.5 wt% organoclay . The infrared spectra exhibited the decrease of vibrational signal of hydrogen bonding from hard domain of PU for samples with more organoclay contents. The water vapor permeation rate and blood coagulation time for the modified PU samples were improved. The transmission electron microscopy images of the sectioned PU samples indicated the intercalated(near exfoliated) dispersion of organoclays in PU composites. The degradation curves for PU samples obtained from thermogravimetric analysis were different with small scale, and it needs more data to put a conclusion.

參考文獻


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被引用紀錄


張禕駿(2009)。聚氨基甲酸酯/散熱涼爽複合材料之合成與功能性質研究〔碩士論文,國立臺北科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0006-3107200913430900

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