本文關(guān)鍵詞： 細(xì)菌纖維素 光致變色 氧化 螺VA嗪 氫鍵復(fù)合　出處：《東華大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：光致變色材料,是一種光學(xué)特性在適當(dāng)?shù)墓饽茌椪蘸蟀l(fā)生改變的新型功能材料,在眾多領(lǐng)域具有潛在應(yīng)用前景。螺VA嗪作為一種新型的光致變色化合物,具有較好的抗疲勞性和光穩(wěn)定性,此外,它還具有響應(yīng)快、化學(xué)性質(zhì)穩(wěn)定等優(yōu)點(diǎn),很有希望進(jìn)入應(yīng)用領(lǐng)域。然而,光致變色化合物一般都是小分子,要真正的廣泛應(yīng)用比較困難,而高分子材料恰恰在這方面有很大優(yōu)勢(shì)。 細(xì)菌纖維素是一種新型的天然高分子材料,它獨(dú)特的納米三維網(wǎng)狀結(jié)構(gòu)使其具備優(yōu)異的物化特性,且表面具有大量的羥基,易于改性和表面修飾。以細(xì)菌纖維素為模板和螺VA嗪化合物復(fù)合,在傳承細(xì)菌纖維素優(yōu)秀性能的同時(shí)具有光致變色的特殊性能,使功能化細(xì)菌纖維素膜在現(xiàn)代光電子材料領(lǐng)域展現(xiàn)了誘人前景。 具體研究?jī)?nèi)容如下： (1)分別合成含羥基和羧基的兩種螺VA嗪化合物。利用紅外、質(zhì)譜和核磁共振氫譜對(duì)其結(jié)構(gòu)進(jìn)行表征,研究了不同外界因素對(duì)其光致變色性能產(chǎn)生的影響。螺VA嗪在晶態(tài)下沒(méi)有光致變色現(xiàn)象,在溶液中具有良好的光致變色性能。隨著溶劑極性的增強(qiáng),螺VA嗪溶液呈色體顏色藍(lán)移,最大吸收波長(zhǎng)紅移。螺VA嗪溶液在不同pH值范圍存在顏色的可逆變化。隨著溫度的降低,螺嗯嗪溶液經(jīng)紫外光照后顏色變深,恢復(fù)速度變慢。 (2)通過(guò)TEMPO/NaClO/NaBr氧化體系對(duì)細(xì)菌纖維素膜進(jìn)行羧基化改性。研究了乙二胺活化和緩沖溶液體系對(duì)提高氧化后羧基含量的影響。在NaClO用量為8mmol/g,反應(yīng)時(shí)間為2小時(shí)的最優(yōu)氧化條件下,羧基含量達(dá)1.22mmol/g。氧化過(guò)程對(duì)細(xì)菌纖維素膜的結(jié)構(gòu)和性能影響不大。 (3)通過(guò)氫鍵作用,制備了細(xì)菌纖維素,氧化細(xì)菌纖維素與螺嗯嗪的復(fù)合膜,研究了復(fù)合膜的光致變色性能。隨著復(fù)合量的增加,熱性能提高。含羥基螺嗯嗪在氧化細(xì)菌纖維素中具有更好的光響應(yīng)性和光穩(wěn)定性,經(jīng)100次顯色消色循環(huán)后,光密度僅僅下降4.9%,抗疲勞性較好。
[Abstract]:Photochromic material is a kind of new functional material optical properties change in the appropriate light irradiation, has a potential application prospect in many fields. As a new type of screw VA in photochromic compounds with anti fatigue resistance and good light stability, in addition, it also has the advantages of fast response, chemical nature is stable, is expected to enter the field of application. However, photochromic compounds are generally small molecules, to achieve a wide range of applications is difficult, and the polymer material just has a great advantage in this respect.
Bacterial cellulose is a new type of natural polymer materials, its unique nano three-dimensional network structure which has excellent physical and chemical properties, and the surface has a large number of hydroxyl groups, easy modification and surface modification. The bacterial cellulose as templates and triazine compound spiro VA, has the special photochromic properties in the inheritance of bacterial cellulose outstanding performance at the same time, the function of bacterial cellulose membrane shows attractive prospect in the field of modern optoelectronic materials.
The specific research contents are as follows:
(1) two kinds of spiral VA compounds were synthesized containing hydroxyl and carboxyl groups. By using infrared, mass spectrometry and nuclear magnetic resonance spectroscopy to characterize the structure, the influence of external factors on the photochromic properties. Spiro VA piperizine in amorphous state without photochromism, with good color performance the light in the solution. With the increasing of solvent polarity, spiro VA in solution is color color blue shift of the maximum absorption wavelength red shift. In the range of existing spiro VA solution reversible color changes at different pH values. With the decrease of the temperature of spirooxazine solution after irradiation Yan color, restore speed slow down.
(2) through the carboxyl modification of bacterial cellulose membrane for TEMPO/NaClO/NaBr oxidation system. The effects of ethylenediamine activation and buffer solution on the carboxyl content after oxidation. Increase in the amount of NaClO is 8mmol/g, the reaction time is 2 hours under the optimum oxidation conditions, little amount of carboxyl containing 1.22mmol/g. oxidation process on structure and properties of bacteria the influence of cellulose membrane.
(3) through hydrogen bonding, bacterial cellulose prepared composite oxide film of bacterial cellulose and spirooxazine, the composite membrane photochromic properties. With the increase of the amount of the composite, improve the thermal performance. The photoresponsive hydroxyl containing spirooxazine has better oxidation in bacterial cellulose and the stability of light. The 100 color bleaching cycles, optical density dropped only 4.9%, fatigue resistance is good.

【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB383.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 沈慶月;陸春華;許仲梓;;光致變色材料的研究與應(yīng)用[J];材料導(dǎo)報(bào);2005年10期

2 孫賓,顧春菊,馬敬紅,梁伯潤(rùn);TEMPO-NaOCl-NaBr氧化體系氧化再生纖維素的動(dòng)力學(xué)研究[J];東華大學(xué)學(xué)報(bào)(自然科學(xué)版);2004年02期

3 申凱華,李曉蓮,崔東熏;一種含螺吡喃和肉桂酸酯雙光功能基團(tuán)的光致變色染料的合成與性能[J];高等學(xué)�；瘜W(xué)學(xué)報(bào);2005年05期

4 沈毅;朱華;趙麗;黃榮;胡國(guó)華;;正丙醇誘導(dǎo)合成WO_3粉體與光致變色性質(zhì)[J];高等學(xué)�；瘜W(xué)學(xué)報(bào);2008年09期

5 龐美麗;婁志剛;龐成才;楊濤濤;孟繼本;;新型雙螺VA嗪分子的合成及性能[J];高等學(xué)校化學(xué)學(xué)報(bào);2012年04期

6 王建營(yíng) ,馮長(zhǎng)根;光致變色現(xiàn)象及其在國(guó)防上的應(yīng)用[J];國(guó)防科技;2005年03期

7 符定良;孟慶華;黃德音;;變色樹脂鏡片及光致變色染料的篩選[J];染料與染色;2007年04期

8 蔣瑩瑩;朱平;董朝紅;李成克;;N-甲基螺VA嗪光致變色染料的合成及其光致變色性質(zhì)研究[J];染料與染色;2009年02期

9 黃廣誠(chéng);吳麗;王穎偉;楊志范;;含羧基和酚羥基螺VA嗪的合成[J];廣西大學(xué)學(xué)報(bào)(自然科學(xué)版);2012年03期

10 周毓;劉艷;;細(xì)菌纖維素研究進(jìn)展[J];廣州化工;2007年02期

，

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