含鎢氧化物光致變色高分子混成薄膜之製備及其性質分析

Preparation and characterization of photochromic tungsten oxide/polymer hybrid films

陳志維(Chih-Wei Chen)

指導教授 ： 張正良

共同指導教授 ： 張朝欽

淡江大學/工學院/化學工程與材料工程學系碩士班/碩士(2008年)

https://doi.org/10.6846/TKU.2008.00128

摘要

本研究成功製備三氧化鎢光致變色材料，利用有機無機混掺法將三氧化鎢與聚丙烯酸混掺成膜，藉由紫外光作為變色反應的驅動力，達到吸收近紅外光效果。本實驗分別探討三氧化鎢含量、反應時間、照光時間、預烘烤時間及膜厚等效應對可見光穿透與近紅外光吸收的影響，並且觀察添加二氧化鈦提升近紅外光吸收的效果。
FTIR、XRD及TEM結果顯示本實驗成功製備三氧化鎢結晶物，且均勻分散在聚丙烯酸中，形成奈米級粒子；UV-visible光譜測試結果得知，三氧化鎢與聚丙烯酸反應3天後製備成膜，厚度223 μm，在60 oC下預烘烤1小時，紫外光照射2小時的效果最好，可見光穿透率與近紅外光遮蔽率的總值可達130以上。此外，隨著二氧化鈦比例增加，薄膜吸收效果變差，與溶液態的結果相反。TGA結果顯示，聚丙烯酸具有三段熱裂解溫度，隨著三氧化鎢或二氧化鈦增加，第一段熱裂解溫度會提前，第二及第三段會延後。
含鎢氧化物光致變色型高分子混成薄膜除了變色反應外，同時具有退色反應，兩者互為可逆反應，需要一周的時間退色反應才會終止。本研究所製備的混成薄膜，循環壽命可維持5次以上，隨著循環次數增加，可見光穿透率與近紅外光遮蔽率總值有所提升，最高可提升至139，為良好的變色材料，深具隔熱膜發展之潛力。

關鍵字

鎢氧化物 ； 光致變色 ； 有機無機混成膜

並列摘要

In this research, tungsten trioxide as a photochromic material had been synthesized and WO3/PAA hybrid films were prepared by blending method. UV light was employed as the energy source for the photochromic reaction of the material in order to perform the NIR absorption. This study probed into the effects of quantity of tungsten oxide, time of reaction, time of UV light exposure, and thickness of the film on the visible light transparency and the NIR absorption. The NIR absorption enhancement by TiO2 addition was also observed.
FTIR、XRD、TEM results showed that the crystalline tungsten oxide was successfully prepared and dispersed uniformly in poly acrylic acid as nano-ordered fine particles. UV-visible results indicated that the WO3/PAA hybrid with blending time of three days could reach its best performance if pre-dried for one hour under 60 oC, 223 μm thick and under UV light irradiation for two hours. The efficiency index of such product reported over 130 in terms of the total value of the percentages of visible transparency and NIR absorption. The absorption efficiency of the hybrid film was decreased with the addition amount of TiO2 was increased. TGA results showed that the thermal of PAA included three major degradation steps, the first degradation temperature decreased while the second and the third ones increased with increasing amount of WO3 or TiO2.
The photochromic tungsten oxide/polymer hybrid films include two mutually reversible reactions, which are photochromic reaction and bleaching reaction. The hybrid films take one week to stop bleaching reaction. A recycle started when the bleached film was exposed under the UV light again. The recycle experiments performed more than five times for each film. The efficiency index increased with increasing recycle runs, and the index of the best one can be raised up to 139. The hybrid films were proved to be qualified photochromic materials and had excellent potential in heat insulation applications.

並列關鍵字

tungsten oxide ； photochromic ； organic-inorganic hybrid film

參考文獻

Electrochemical Society, 1973, 120, 766-769.

1975, 36, 176

Niklasson and L. Stenmark, “Titanium-aluminum-nitride

coatings for satellite temperature control”, Thin Solid

8.A. Donnadieu, Material Science and Engineering, 1989, B3,