【摘要】：本文選取廢棄核桃殼(常見的生物質(zhì)材料)作為原材料,通過化學活化和物理活化(微波水蒸汽加熱),將其制成多孔材料;選取石蠟、癸酸兩種相變材料,采用真空浸入法與之復合,制備出多孔相變復合材料。分別利用全自動比表面積及孔徑分析儀、掃描電子顯微鏡、傅里葉變換紅外光譜儀對制備出的核桃殼多孔材料以及多孔相變復合材料的孔徑、形貌、結構進行表征�？讖綔y試結果表明:使用活化劑處理所得多孔活性炭較未使用活化劑活化所得多孔活性炭具有更發(fā)達的孔隙結構,無論是比表面積還是孔體積均大幅增加。形貌測試結果表明:使用活化劑活化所得多孔活性炭呈復雜的網(wǎng)狀結構,具有良好的孔隙結構;多孔相變復合材料中相變材料被吸附在多孔活性炭的孔內(nèi)以及孔周圍。結構測試結果表明:使用活化劑活化所得多孔活性炭的表面含有羧基、羥基以及醚基等官能團,這些官能團的存在使得制備出的多孔活性炭具有較好的吸附能力。其次,利用熱分析儀、恒溫恒濕箱等測試儀器,對多孔相變復合材料的熱濕性能進行測試。熱性能測試結果表明:多孔相變復合材料具有適宜的相變溫度以及相變潛熱,在熔化、凝固過程中的相變溫度分別為28.15℃、34.05℃;相變焓分別為66.45J/g、65.5J/g。濕性能測試結果表明:無論是飽和鹽溶液測試法還是恒溫恒濕箱測試法,多孔相變復合材料均具有一定的吸放濕性能,在相對濕度升至最大時,其最大平衡吸濕量為0.3509g/g,相對濕度降至最低時,最大平衡放濕量為0.3519g/g。最后,將多孔相變復合材料與石膏復合,對石膏基多孔相變復合材料進行熱濕性能的試驗。試驗結果表明:隨著多孔相變復合材料摻入量的增加,石膏基相變復合材料的儲放熱能力有所增加,并且吸放濕能力也隨之增加。在此基礎上,本文對石膏基相變復合材料的調(diào)溫調(diào)濕機理也進行了淺略的探討。
[Abstract]:In this paper, waste walnut shell (common biomass material) is used as raw material, and it is made into porous material by chemical activation and physical activation (microwave steam heating), paraffin and sebacic acid are selected as phase change materials, Porous phase change composites were prepared by vacuum immersion method. The pore size, morphology and structure of porous walnut shell and porous composites were characterized by automatic surface area and pore size analyzer, scanning electron microscope and Fourier transform infrared spectroscopy. The pore size test results show that the porous activated carbon treated with activator has more developed pore structure than that without activator, and both the specific surface area and pore volume increase significantly. The results show that the porous activated carbon activated by activator has a complex network structure with good pore structure, and the phase change material in the porous phase change composites is adsorbed in and around the pore of porous activated carbon. The results of structure test show that the surface of porous activated carbon activated by activator contains carboxyl, hydroxyl and ether groups. The existence of these functional groups makes the porous activated carbon have better adsorption ability. Secondly, the thermal and moisture properties of porous phase change composites were measured by means of thermal analyzer and constant temperature and humidity box. The results of thermal performance test show that the porous phase change composites have suitable phase transition temperature and latent heat, the phase transition temperatures are 28.15 鈩，

本文編號：2268309