本文關(guān)鍵詞：二氧化碳與己二胺反應(yīng)合成二氧化碳基聚脲　出處：《長(zhǎng)春工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 聚脲 二氧化碳轉(zhuǎn)化 縮聚反應(yīng) 己二胺 熱穩(wěn)定性

【摘要】：二氧化碳的活化與轉(zhuǎn)化是綠色化學(xué)領(lǐng)域的一個(gè)熱點(diǎn)問題。以二氧化碳為碳源合成高附加值化學(xué)品具有廣闊的應(yīng)用前景。聚脲是一種新型的聚合物,結(jié)構(gòu)中含有強(qiáng)極性的脲基并且可以形成大量的氫鍵,具有優(yōu)異的性能和廣泛的應(yīng)用。但是,聚脲的工業(yè)合成過程涉及到劇毒的二異氰酸酯的使用,給環(huán)境以及操作人員的安全帶來威脅。因此,由二氧化碳作為碳氧資源取代異氰酸酯的合成路線具有重要的科學(xué)研究意義和實(shí)際應(yīng)用價(jià)值。本論文選擇己二胺為反應(yīng)物,研究了己二胺與二氧化碳直接反應(yīng)合成聚脲的影響因素,如溫度、壓力、反應(yīng)時(shí)間等。通過一系列表征手段確定了產(chǎn)物的化學(xué)結(jié)構(gòu)、凝聚態(tài)結(jié)構(gòu)、熱穩(wěn)定性,并探討了催化劑和溶劑對(duì)反應(yīng)的影響。為了提高產(chǎn)物分子量,合成具有一定強(qiáng)度的聚脲產(chǎn)品,設(shè)計(jì)了兩段聚合反應(yīng)過程:(1)合成聚脲齊聚物的預(yù)聚合反應(yīng);(2)合成聚脲材料的后聚合反應(yīng)。研究結(jié)果表明,己二胺與二氧化碳的反應(yīng)受溫度和壓力的影響較大,隨著溫度或壓力的增加,聚脲的產(chǎn)率均呈現(xiàn)增加的趨勢(shì),但溫度或壓力增加到某一程度后,收率出現(xiàn)相應(yīng)的降低。延長(zhǎng)反應(yīng)時(shí)間到一定程度,收率不再增加,這與逆反應(yīng)的發(fā)生和產(chǎn)物的熱穩(wěn)定性有關(guān)。催化劑和溶劑的引入可以提高產(chǎn)物的收率。與齊聚物相比,后聚合得到的聚脲結(jié)晶程度降低,熱穩(wěn)定性以及耐溶劑性有較大的提高,說明后聚合過程一定程度上解決了副產(chǎn)物水的脫出問題,使反應(yīng)向分子鏈增長(zhǎng)的方向進(jìn)行。根據(jù)拉伸測(cè)試的結(jié)果來看,最終產(chǎn)物是脆性材料,具有一定的拉伸強(qiáng)度,斷裂伸長(zhǎng)率較低。
[Abstract]:The activation and transformation of carbon dioxide is a hot issue in the field of green chemistry. The synthesis of high added value chemicals with carbon dioxide as carbon source has a broad application prospect. Polyurea is a new type of polymer. It contains a strong polar urea group and can form a large number of hydrogen bonds. It has excellent properties and wide application. However, the industrial synthesis of polyurea involves the use of highly toxic diisocyanate, which threatens the safety of the environment and the operators. Therefore, the synthesis route of carbon dioxide as carbon and oxygen resource instead of isocyanate has important scientific research significance and practical application value. This paper choose hexanediamine as reactants, study the influence factors of hexamethylenediamine and carbon dioxide to synthesize polyurea direct reaction, such as temperature, pressure, reaction time etc.. The chemical structure, the condensed structure and the thermal stability of the products were determined by a series of characterization methods, and the effects of the catalyst and solvent on the reaction were also discussed. In order to improve the molecular weight of products and synthesize polyurea products with certain strength, two stage polymerization process was designed: (1) pre polymerization of polyurea oligomers; (2) synthesis of polyurea materials after polymerization. The results show that the influence of hexamethylenediamine and carbon dioxide was affected by temperature and pressure greatly, with the increase of pressure or temperature, the yield of polyurea showed an increase trend, but the temperature or pressure increases to a certain extent, reduce the corresponding yield. When the reaction time is extended to a certain extent, the yield is no longer increased, which is related to the occurrence of the inverse reaction and the thermal stability of the product. The introduction of catalyst and solvent can improve the yield of the product. Compared with oligomers, the crystallization degree of polyurea obtained by post polymerization decreased, and the thermal stability and solvent resistance increased greatly, indicating that the process of post polymerization could solve the problem of water withdrawal of by-products to a certain extent, and make the reaction toward the direction of molecular chain growth. According to the results of the tensile test, the final product is brittle material, with a certain tensile strength, and the elongation at break is low.
【學(xué)位授予單位】：長(zhǎng)春工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O631.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 Sheng-Ping Wang;Jing-Jie Zhou;Shu-Yang Zhao;Yu-Jun Zhao;Xin-Bin Ma;;Enhancements of dimethyl carbonate synthesis from methanol and carbon dioxide:The in situ hydrolysis of 2-cyanopyridine and crystal face effect of ceria[J];Chinese Chemical Letters;2015年09期

2 Shu-sheng Li;Hui Han;朱曉麗;Xu-bao Jiang;孔祥正;;Preparation and Formation Mechanism of Porous Polyurea by Reaction of Toluene Diisocyanate with Water and Its Application as Adsorbent for Anionic Dye Removal[J];Chinese Journal of Polymer Science;2015年08期

3 王寶柱;劉培禮;;關(guān)于聚脲熱點(diǎn)問題的探討[J];中國(guó)建筑防水;2009年12期

4 李振環(huán);蘇坤梅;程博聞;沈德新;;通過轉(zhuǎn)化為有機(jī)化合物固定化二氧化碳[J];天然氣化工(C1化學(xué)與化工);2009年01期

5 浦鴻汀;劉泰;楊正龍;袁俊杰;;聚脲的合成與應(yīng)用[J];高分子材料科學(xué)與工程;2008年07期

6 黃微波,王寶柱,陳酒姜,劉培禮,劉東暉;噴涂聚脲彈性體技術(shù)在我國(guó)的發(fā)展和展望[J];聚氨酯工業(yè);2002年03期

7 黃微波,楊宇潤(rùn),王寶柱;噴涂聚脲彈性體技術(shù)[J];聚氨酯工業(yè);1999年04期

8 盧培剛,姚立丹,孫東寧;聚脲潤(rùn)滑脂在汽車行業(yè)的應(yīng)用[J];汽車技術(shù);1994年12期

9 華耀和;陳峰;;反應(yīng)注射模塑(RIM)聚脲彈性體發(fā)展概況[J];聚氨酯工業(yè);1990年04期

，

本文編號(hào)：1344610