本文選題：相變材料 + 十八烷��； 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：相變材料指在特定溫度范圍內(nèi)發(fā)生相變化過程,能吸收、儲存和釋放大量的潛熱且溫度幾乎保持不變的材料,相變儲能是一種環(huán)保、綠色和高效的儲能方式。膠囊化是將功能材料通過成膜材料包覆起來制備成微小顆粒,有效解決了相變材料的使用、儲存和運(yùn)輸?shù)葐栴},提高了相變材料的使用效率,拓寬了相變材料的應(yīng)用領(lǐng)域。相變材料微膠囊具有相變潛熱大、儲熱密度高、性能穩(wěn)定以及使用壽命長等優(yōu)點(diǎn),并且具有雙向控溫功能,是目前儲能領(lǐng)域研究的熱點(diǎn)。本論文研究了粒徑在0.5 mm～2.0 mm均一可控的相變儲能大膠囊。十八烷/海藻酸鈣-PAMA相變儲能復(fù)合大膠囊;采用懸浮聚合工藝制備以聚甲基丙烯酸烯丙酯(PAMA)為囊壁,十八烷為芯材的微膠囊,后采用溶液噴射法分別以海藻酸鈣和混合羧基化碳納米管(CCNTs)為基材包覆微膠囊制備復(fù)合相變大膠囊,對膠囊進(jìn)行測試分析,研究了芯壁比、海藻酸鹽和混合CCNTs的海藻酸鹽對MicroPCMs和MacroPCMs表面形貌、微觀結(jié)構(gòu)和熱性能的影響,金屬離子絡(luò)合和加入CCNTs制備的相變復(fù)合大膠囊表現(xiàn)出良好的儲能和熱性能,在儲熱和調(diào)溫服裝領(lǐng)域的有廣闊的前景。十八烷/海藻酸鈣-SiO2相變儲能復(fù)合大膠囊;實(shí)驗(yàn)以十八烷作為芯材,海藻酸鈉為基材,SiO2用于改性基體并作為微膠囊壁材。研究凝膠-溶膠法正硅酸乙酯水解聚合形成SiO2壁材的條件、原理和過程,無機(jī)囊壁增強(qiáng)了有機(jī)囊壁材料的熱穩(wěn)定性、致密性和強(qiáng)度。對復(fù)合相變大膠囊FTIR、XRD和熱分析等測試表明復(fù)合過程只存在物理吸附,十八烷和基體及Si02之間沒有發(fā)生化學(xué)反應(yīng),形成微膠囊后十八烷和SiO2的晶體結(jié)構(gòu)均未發(fā)生改變,形成了粒徑均一潛熱為140.6 J/g的大膠囊,且隨著Si02在壁材中含量的增加,有效的抑制過冷,且具有良好的熱穩(wěn)定性和較大的比表面積,可在微膠囊功能熱流體和其他儲能領(lǐng)域得到應(yīng)用。醋酸纖維素相變儲能復(fù)合微膠囊。本實(shí)驗(yàn)是通過溶液噴射法將乳液噴到在170℃的環(huán)境中制備以醋酸纖維素為壁材,十八烷為芯材的相變儲能微膠囊,并通過戊二醛對微膠囊進(jìn)行交聯(lián)處理,制備密封性更好的相變儲能微膠囊。醋酸纖維素具有交聯(lián)網(wǎng)狀結(jié)構(gòu),增加了相變材料的接觸面積,對于相變材料的傳熱和能量的釋放起到很好的作用。
[Abstract]:Phase change materials can absorb, store and release a large amount of latent heat and the temperature is almost unchanged. Phase change energy storage is an environmentally friendly, green and efficient energy storage method. Encapsulation is the preparation of micro particles by coating functional materials through film-forming materials, which effectively solves the problems of the use, storage and transportation of phase change materials, improves the use efficiency of phase change materials, and widens the application fields of phase change materials. Phase change materials microcapsules have the advantages of large latent heat storage, high thermal storage density, stable performance and long service life, and have the function of bidirectional temperature control, which is a hot spot in the field of energy storage. In this paper, phase change energy storage capsules with a uniform and controllable particle size of 0. 5 mm~2.0 mm were studied. Octadecane / calcium alginate PAMA phase change energy storage composite large capsules were prepared by suspension polymerization process, using polyallyl methacrylate (PAMA) as capsule wall and octadecane as core material. The microcapsules were coated with calcium alginate and mixed carboxylated carbon nanotubes (CCNTs), respectively. The effects of alginate and alginate mixed with CCNTs on the surface morphology, microstructure and thermal properties of MicroPCMs and MacroPCMs were studied. In the field of heat storage and temperature adjustment clothing has broad prospects. Octadecane / calcium alginate-Sio _ 2 phase change energy storage composite large capsules were used as core materials and sodium alginate as base materials in the experiment. The conditions, principles and processes of hydrolytic polymerization of ethyl orthosilicate to form SiO2 wall by gel sol method were studied. The inorganic wall enhanced the thermal stability, densification and strength of the organic cystic wall material. The results of FTIR XRD and thermal analysis showed that there was no chemical reaction between octadecane and matrix or Si02. The crystal structure of octadecane and SiO2 had not changed after the formation of microcapsule. A large capsule with homogeneous latent heat of 140.6 J / g was formed. With the increase of Si02 content in the wall material, the supercooling was effectively inhibited, and the capsule had good thermal stability and large specific surface area. It can be used in microencapsulation thermal fluid and other energy storage fields. Cellulose acetate phase change energy storage composite microcapsules. In this experiment, phase change energy storage microcapsules with cellulose acetate as wall material and octadecane as core material were prepared by spray emulsion at 170 鈩，

本文編號：1797998