研究生: |
蘇訓右 Hsun-Yu Su |
---|---|
論文名稱: |
水性聚胺酯樹脂/聚矽酸奈米複合材料之製備與性質之研究 |
指導教授: |
馬振基
Chen-Chi Ma |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 157 |
中文關鍵詞: | 水性聚胺酯樹脂 、聚矽酸奈米顆粒 、奈米複合材料 |
相關次數: | 點閱:4 下載:0 |
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本研究旨在合成水性PU ( Waterborne Polyurethane ),除具有一般水性PU樹脂的基本結構外,並利用3-aminopropyl-triethoxysilane (APTS)使得分子鏈尾端帶有silane的官能基。由於其尾端的silane會與聚矽酸 ( Polysilicic acid nanoparticle, PN ) 表面的OH進行溶膠-凝膠反應,產生共價鍵結,藉此可達到均勻分散的目的;另外利用Phenyltrimethoxysilane(PTMS)及3-(trimethoxysilyl) propyl ester (TMPE)將PN奈米顆粒改質後,藉由混摻的方法將無機奈米顆粒均勻分散在水性PU中,製備三種水性PU/聚矽酸奈米複合材料並探討材料的結構與熱、機械、氣體滲透率的性質。
在結構鑑定方面,利用動態光散射法得知PN奈米顆粒的分佈情形,粒徑分佈從3~25 nm,平均粒徑為9 nm。從FT-IR圖譜,除了可得知P N表面帶有OH官能基外,PTMS及TMPE亦將PN表面做適當的改質。由GPC的結果得知,本研究合成的水性PU其數目平均分子量為10,000∼15,000,Polydispersity Index (PDI)為1.6~2.0。
在材料的結構分析方面,從SEM的照片觀察,可發現PN的含量在20 wt.%以下時,以50 nm的大小均勻分散在高分子基材中,藉由Si-mapping技術可知PN在高分子基材的分佈情形。當PN含量超過20 wt.%時,可明顯看到無機物聚集,發生相分離的現象;對於PTMS-PN及TMPE-PN的混摻系統,可發現當添加量達30 wt.%時,奈米顆粒有明顯的團聚現象。由FT-IR圖譜的計算,可知PN與水性PU彼此之間的氫鍵作用力,在PN含量為10 wt.%時,氫鍵羰基的比例最高;在PTMS-PN及TMPE-PN的系統中,當添加量在5 wt.%之後,氫鍵羰基的比例變化趨於和緩。由外觀型態以及UV-Vis結果可知,經過PTMS及TMPE改質後的PN奈米顆粒,除了材料的透明性增加之外,也有助於PN奈米顆粒的添加量。利用DSC及XRD圖譜可知無機物的添加對於硬鏈段的結晶有較大的影響,結晶型態包括α-form、γ-form及三斜晶系。針對偏矽酸鈉而言,經溶膠-凝膠反應後,矽原子形成矽氧烷鍵單取代時被標定為Q1,二取代為Q2,三取代為Q3,四取代為Q4;對於APTS而言,經溶膠-凝膠反應後,矽原子形成矽氧烷鍵單取代時被標定為T1,二取代為T2,三取代為T3,由29Si固態NMR可知純水性PU的T1、T2、T3結構,有機矽形成一個Si-O-Si的鍵結(T1)比例較高,隨著無機物的含量增加,T的結構逐漸減弱,無機矽的鍵結數目,即Q的結構型態逐漸明顯,PN、TMPE-PN的複合材料,其無機矽形成三個Si-O-Si鍵結(Q3)比例大於Q4,PTMS-PN則是Q4大於Q3。
在整體的材料性質方面,由TGA的分析結果可知, 其熱裂解溫度隨著PN含量的增加而遞增,從269.2℃上升到318.5℃,提升約50℃,對於PTMS-PN奈米複合材料,從269.2℃上升到324.2℃,增加約55℃,TMPE-PN則從269.2℃上升到332.4℃,提升約60℃,顯示TMPE-PN複合材料在熱性質方面較穩定。在拉伸性質方面,PN複合材料的最大應力從0.09 MPa提升至3.40 MPa,增加38倍,楊氏模數增加11倍;PTMS-PN者的最大應力從0.09 MPa上升至3.65 MPa,增加約40倍,楊氏模數提升37.82 MPa,增加15倍;TMPE-PN複合材料最大應力增加15倍,楊氏模數提高15.17 MPa,增加7倍。不論是最大應力或是楊氏模數,PTMS-PN的效果最好,PN次之,TMPE-PN較差。氧氣滲透率方面,複合材料隨著PN含量增加,從4.56 X 10-11上升至9.24 X 10-11,提升2倍;當PTMS-PN添加量為10wt.%時,複合材料有最好的氧氣滲透效果,從4.56 X 10-11上升至10.4 X 10-11,增加2倍;當TMPE-PN添加量為20wt.%時,氧氣滲透率從4.56 X 10-11提升至8.84 X10-11,增加2倍。動態機械性質方面,在-25℃下,當PN添加量為10wt%時,複合材料的Storage Modulus有最佳值,從0.76 X 10-8 MPa提升為9.83 X 10-8 MPa,增加12倍;PTMS-PN含量為5wt.%時有最佳值,從0.76 X 10-8 MPa提升為13.3 X 10-8 MPa,增加17倍,當TMPE-PN含量為10wt.%時,複合材料的儲存模數從0.76 X 10-8 MPa上升至8.97 X 10-8 MPa,提升12倍。由此可知PTMS-PN奈米複合材料具有較好的動態機械性質。
Three novel nanocomposites including Polysilicic acid nanoparticle (PN)、PTMS-PN 、TMPE-PN / Waterborne Polyurethane (WPU) have been prepared. Two methods were used to well disperse inorganic nanoparticles in the polymer matrix:the sol-gel process and blending process. The OH functional groups attatched on surface of PN nanoparticles would react with end-capped silane on WPU via sol-gel process. These PN nanoparticles were modified by Phenyltrimethoxysilane (PTMS) and 3-(trimethoxysilyl) propyl ester (TMPE). The nanostructure, thermal, mechanical, gas permeation properties of the three nanocomposites were investigated.
Size distribution of PN nanoparticles was measured by dynamic light scattering method ranging from 3 to 25 nm. The average size of PN nanoparticles was 9 nm. From GPC result, it was found that the number molecular weight of WPU was 10,000~15,000 and Polydispersity was 1.6~2.0.
The morphology study results showed that PN nanoparticles were well dispersed in waterborne polyurethane within a nano-scale (50 nm). When PN content was over 20 wt%, phase separation may occur. Si-mapping technique was used to observe the dispersion of PN in the polymer matrix. When PTMS-PN and TMPE-PN contents went up to 30 wt.%, phase separation may take place. FT-IR results showed that the fraction of hydrogen bonded carbonyl group reached the maximum when PN content was 10 wt.%. The PTMS-PN and TMPE-PN nanocomposites showed more transparency which was further proved by UV-visible measurement. The crystalline structure of hard segment of waterborne polyurethane was greatly influenced by nanoparticles from DSC spectrum. The XRD results revealed that α-form, γ-form, or triclinic crystallization could be found in waterborne polyurethane matrix at different inorganic contents.
TGA results showed that introducing inorganic fillers could increase the thermal stability of WPU. For example, the 10% weight loss of nanocomposite increased from 269.2℃ to 318.5℃ (increased by 50℃) when the PN content was 20 wt%; in the PTMS-PN system, the degradation temperatures were increased from 269.2℃ to 324.2℃ (increased by 55℃); in TMPE-PN system, the degradation temperatures were enhanced from 269.2℃ to 332.4℃ (increased by 63℃). The TMPE-PN system exhibited the best thermal stability.
The tensile stress and Young’s modulus of nanocomposite increased with the increasing of PN content. Results showed that maximum tensile stress of nanocomposite increased from 0.09 MPa to 3.40 MPa (increased by 37 times),and Young’s modulus raised 27.01 MPa (increased by 11 times). In the PTMS-PN system, the maximum tensile stress of nanocomposite increased from 0.09 MPa to 3.65 MPa (increased by 40 times),and Young’s modulus raised 37.82 MPa (increased by 15 times). In the TMPE-PN system, the maximum tensile stress of nanocomposite raised 1.25 MPa (increased by 15 times), and Young’s modulus raised 15.17 MPa (increased by 7 times). PTMS-PN nanocomposites displayed the best tensile properties.
Oxygen permeability of PN nanocomposites increased from 4.56 X 10-11 to 9.24 X 10-11 ( cc •(STP) •cm) / (cm2•sec•cmHg) (increased 103%). In the PTMS-PN system, the oxygen permeability of nanocomposite increased from 4.56 X 10-11 to 10.4 X 10-11 ( cc •(STP) •cm) / (cm2•sec•cmHg) (increased 128%) when the PTMS-PN content was 10wt%. In the TMPE-PN system, the oxygen permeability of nanocomposite increased from 4.56 X 10-11 to 8.84 X 10-11( cc •(STP) •cm) / (cm2•sec•cmHg) (increased 94 %).
The dynamic mechanical properties of nanocomposite were measured by a Dynamic Mechanical Analysers (DMA). Results revealed that the storage modulus of PN nanocomposite was 9.83 X 108 Pa (increased 12 times) when the PN content was 10wt% at -25℃. In PTMS-PN system, the storage modulus of nanocomposite was increased from 0.76 X 108 Pa to 13.3 X 108 Pa (increased 17 times) when the PTMS-PN content was 5wt%. In TMPE-PNsystem, the storage modulus of nanocomposite was from 0.76 X 108 Pa to 8.97 X 108 Pa (increased 12 times). From the results it could be found that PTMS-PN nanocomposite possessed better dynamic mechanical properties than others.
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