本文關(guān)鍵詞：懸浮聚合法和銳孔法制備十二醇相變材料膠囊　出處：《上海應(yīng)用技術(shù)學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 懸浮聚合 微膠囊 銳孔法 大膠囊 十二醇

【摘要】：本課題首先以相變材料十二醇(DA)為芯材,聚甲基丙烯酸甲酯(PMMA)為壁材,用懸浮聚合法制備十二醇相變材料微膠囊,并考察了分散劑、引發(fā)劑、芯壁比以及交聯(lián)劑用量對制備十二醇微膠囊的影響。采用生物顯微鏡、掃描電子顯微鏡(SEM)、傅立葉變換紅外光譜儀(FT-IR)、差示掃描量熱儀(DSC)、熱重分析儀(TGA)以及粒徑掃描儀(PSD)對相變微膠囊的形態(tài)、結(jié)構(gòu)組成、相變溫度、相變焓及耐熱性進(jìn)行表征。結(jié)果表明制備相變微膠囊的最佳條件為：分散劑苯乙烯-馬來酸酐共聚物(SMA)加入量為芯材質(zhì)量的7.5%,引發(fā)劑偶氮二異丁腈(AIBN)為壁材的7.5%,交聯(lián)劑季戊四醇四丙烯酸酯(PETRA)用量為壁材的25%,芯壁比為2：1時(shí),所制備的十二醇相變材料微膠囊包埋效果最好。包埋率達(dá)到66%。制備所得的十二醇微膠囊的相變溫度與十二醇變化很小,熱焓值為137.6 J/g,相變溫度為24.33℃。經(jīng)過500次熱循環(huán)后仍具有良好的熱焓值,與未進(jìn)行熱循環(huán)的微膠囊變化不大。SEM圖顯示微膠囊呈球形。經(jīng)過PSD測量得知,所制備的十二醇微膠囊的尺寸大小范圍在15.14-35.90gm之間。微膠囊顆粒的平均粒徑是25.65 μm。采用銳孔法制備十二醇相變材料大膠囊,考察了CaCl_2溶液的濃度,海藻酸鈉溶液的濃度和微膠囊加入量對最終形成大膠囊粒徑及耐熱性的影響,最終確定CaCl_2的濃度為2%,海藻酸鈉溶液濃度為1%的條件下,根據(jù)需要可制備包含不同微膠囊質(zhì)量的,粒徑在1mm以上的相變材料大膠囊。本課題通過對聚合方式及制備過程中影響因素的選擇實(shí)現(xiàn)了對十二醇相變材料膠囊粒徑的控制,從而擴(kuò)展了相變材料的應(yīng)用領(lǐng)域。
[Abstract]:In this paper, 12 alcohol phase change material microcapsules were prepared by suspension polymerization with phase change material (12) as core material and poly (methyl methacrylate) (PMMA) as wall material. The dispersant and initiator were investigated. The effects of core / wall ratio and crosslinking agent dosage on the preparation of 12 alcohol microcapsules were investigated by means of biomicroscopy, scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The morphology, structure and temperature of phase change microcapsules by differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA) and particle size scanner (PSD). The results showed that the optimum conditions for the preparation of phase change microcapsules were as follows: the amount of dispersant styrene-maleic anhydride copolymer (SMA) was 7.5% of the core material. The initiator AIBN is 7.5% of the wall material, the amount of crosslinking agent pentaerythritol tetraacrylates (PETRAN) is 25% of the wall material, and the core / wall ratio is 2: 1. The microencapsulation effect of 12 alcohol phase change material was the best. The embedding rate reached 66. The phase transition temperature and 12 alcohol phase transition temperature of the 12 alcohol microcapsule prepared changed little, and the enthalpy value was 137.6 J / g. The phase transition temperature is 24.33 鈩，

本文編號：1431184