本文關(guān)鍵詞： 氧化石墨烯 共價改性 聚乳酸 阻隔性 取向　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文主要研究了氧化石墨烯的聚合物共價修飾及其對聚乳酸薄膜的改性。通過原位縮聚法制備出表面接枝聚乳酸的氧化石墨烯(PLLA-g-GO),并用PLLA-g-GO增強(qiáng)聚乳酸,通過溶液共混法制備了聚乳酸基復(fù)合薄膜,之后又對復(fù)合薄膜進(jìn)行拉伸處理。重點(diǎn)考察了聚乳酸基復(fù)合材料的力學(xué)、熱學(xué)及阻隔等性能的變化。以乳酸為原料,采用原位縮聚法,一步完成了氧化石墨烯表面的聚乳酸接枝。FT-IR、XPS證明在氧化石墨烯表面接枝了聚乳酸分子鏈,拉曼和XPS顯示PLLA-g-GO在改性過程中發(fā)生了部分還原。PLLA-g-GO的表面性能有所變化,能穩(wěn)定分散在三氯甲烷中。以三氯甲烷為溶劑,采用溶液共混法,制備了聚乳酸/PLLA-g-GO復(fù)合薄膜。SEM、XRD結(jié)果表明,PLLA-g-GO在聚乳酸基體中均勻分散。TGA和力學(xué)測試表明,PLLA-g-GO的添加使復(fù)合薄膜的熱穩(wěn)定性和拉伸強(qiáng)度都得到了提高。阻隔性測試表明,PLLA-g-GO的添加顯著提高了薄膜對氧氣的阻隔性,PLLA-g-GO含量為0.5wt%時,復(fù)合薄膜的氧氣滲透系數(shù)相比純聚乳酸降低了 77.4%。對聚乳酸/PLLA-g-GO復(fù)合薄膜進(jìn)行單軸拉伸,SEM圖片顯示,PLLA-g-GO在聚乳酸基體中得到了一定的平面取向,PLLA-g-GO趨于平行于薄膜排列。拉伸后的復(fù)合薄膜對氧氣的阻隔性大幅提高,其氧氣滲透系數(shù)低至1.7xl0~(-15)cm~3·cm·cm~(-2)·s~(-1)·Pa~(-1),相比未拉伸的復(fù)合薄膜降低了 93.3%。
[Abstract]:In this paper, the polymer covalent modification of graphene oxide and the modification of polylactic acid film were studied. PLLA-g-GOG was prepared by in-situ Polycondensation of poly (lactic acid) oxide (PLLA-g-GOO). Poly (lactic acid) based composite film was prepared by solution blending method with PLLA-g-GO reinforced polylactic acid, and then the composite film was treated by tensile treatment. Using lactic acid as raw material and in situ Polycondensation, the polylactic acid grafted on graphene oxide surface. FT-IR was completed in one step. XPS showed that the poly (lactic acid) chain was grafted on the surface of graphene oxide. Raman and XPS showed that the surface properties of PLLA-g-GO partially reduced. PLLA-g-GO were changed. The poly (lactic acid) / PLLA-g-GO composite film was prepared by solution blending method in the presence of trichloromethane, and the XRD results showed that the composite film was composed of poly (lactic acid) / PLLA-g-GO composite film. PLLA-g-GO was uniformly dispersed in poly (lactic acid) matrix. The thermal stability and tensile strength of the composite films were improved with the addition of PLLA-g-GO. The barrier test showed that the addition of PLLA-g-GO significantly improved the oxygen barrier of the films. The content of PLLA-g-GO was 0.5 wt%. The oxygen permeation coefficient of the composite film was 77.4% lower than that of pure polylactic acid. The uniaxial tensile SEM images of PLA / PLLA-g-GO composite film were shown. The plane orientation of PLLA-g-GO in the polylactic acid matrix tends to be parallel to the film arrangement, and the oxygen barrier of the composite film after stretching is greatly improved. The oxygen permeability coefficient is as low as 1.7 脳 10 ~ (-15) 路cm 路cm ~ (-1) 路s ~ (-1) 路Pao ~ (-1)). Compared with the unstretched composite film, 93. 3% lower.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.2;TQ323.41

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 Paul CHEN;Roger RUAN;;Polylactic acid (PLA) synthesis and modifications:a review[J];Frontiers of Chemistry in China;2009年03期

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本文編號：1461459