【摘要】：碳納米管（CNTs）獨(dú)特的結(jié)構(gòu)使其擁有優(yōu)良的力學(xué)、電學(xué)、熱學(xué)性能，其作為增強(qiáng)填料應(yīng)用于聚合物納米復(fù)合材料領(lǐng)域具有廣闊的前景。以碳納米管為填充劑，增強(qiáng)高聚物納米復(fù)合材料的阻燃特性已成為研究的熱點(diǎn)。由于對(duì)碳納米管在聚合物納米復(fù)合材料阻燃方面的研究相對(duì)較晚一些，其在不同火災(zāi)場(chǎng)景下的阻燃特性和阻燃機(jī)理仍不明確。 本文采用原位聚合法，利用多壁碳納米管（MWNT）與甲基丙烯酸甲酯（MMA）混合液，制備PMMA/MWNT納米復(fù)合材料，研究了如何提高M(jìn)WNT在MMA單體中的分散性，以及合成PMMA和MWNT/PMMA復(fù)合材料的影響因素。利用熱失重分析儀研究復(fù)合材料的熱穩(wěn)定性。采用錐形量熱儀研究復(fù)合材料的燃燒特性，測(cè)試材料在不同輻射熱通量下的熱釋放速率、引燃時(shí)間、CO生產(chǎn)率以及CO2生產(chǎn)率。利用水平垂直燃燒儀研究了復(fù)合材料火焰?zhèn)鞑ニ俣群妥枞嫉燃?jí)。 研究結(jié)果表明，超聲波和機(jī)械攪拌同時(shí)作用，并輔以一定量的表面活性劑，更有利于MWNT的分散。影響純PMMA合成的主要因素有引發(fā)劑含量、預(yù)聚合時(shí)間和溫度、聚合反應(yīng)的溫度；碳納米管的添加，，改變了復(fù)合材料的預(yù)聚時(shí)間和聚合溫度。MWNT的添加并沒有顯著提高復(fù)合材料的熱穩(wěn)定性；添加1wt%的MWNT時(shí)，復(fù)合材料的熱釋放速率峰值降低的最明顯，同時(shí)能較好的抑制燃燒過程中熔滴現(xiàn)象的產(chǎn)生；MWNT的添加并沒有增加CO的產(chǎn)量，但加快了CO2的生產(chǎn)率。依據(jù)材料燃燒實(shí)驗(yàn)測(cè)試結(jié)果，推斷MWNT/PMMA復(fù)合材料是氣相阻燃和凝固相阻燃共同作用。
[Abstract]:Carbon nanotubes (CNTs) have excellent mechanical, electrical and thermal properties due to their unique structure. As reinforcements, CNTs have a broad prospect in the field of polymer nanocomposites. The flame retardancy of polymer nanocomposites reinforced by carbon nanotubes (CNTs) has become a hot topic. Because the flame retardancy of carbon nanotubes in polymer nanocomposites is relatively late, the flame retardancy and flame retardant mechanism of carbon nanotubes in different fire scenarios are still unclear. In this paper, PMMA/MWNT nanocomposites were prepared by in-situ polymerization with the mixture of multi-walled carbon nanotubes (MWNT) and methyl methacrylate (MMA). The dispersion of MWNT in MMA monomer and the factors affecting the synthesis of PMMA and MWNT/PMMA composites were studied. The thermal stability of composites was studied by thermogravimetric analysis. The combustion characteristics of composites were studied by cone calorimeter. The heat release rate, ignition time, CO productivity and CO2 productivity were measured under different radiant heat fluxes. The flame propagation velocity and flame retardant grade of composite materials were studied by horizontal and vertical combustion apparatus. The results show that ultrasonic wave and mechanical stirring act simultaneously with a certain amount of surfactant, which is more favorable to the dispersion of MWNT. The main factors affecting the synthesis of pure PMMA are initiator content, prepolymerization time and temperature, temperature of polymerization, addition of carbon nanotubes, The prepolymerization time and polymerization temperature of the composites were changed. The thermal stability of the composites was not significantly improved with the addition of MWNT, and the peak value of the thermal release rate of the composites decreased most obviously with the addition of 1wt% MWNT. The addition of MWNT did not increase the production of CO, but accelerated the productivity of CO2. According to the results of combustion test, it is inferred that MWNT/PMMA composite is the joint action of gas phase flame retardant and solidified phase flame retardant.
【學(xué)位授予單位】：沈陽(yáng)航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ127.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 賈志杰,王正元,梁吉,魏秉慶,吳德海,張?jiān)雒?PA6/碳納米管復(fù)合材料的復(fù)合方法的研究[J];材料工程;1998年09期

2 龔曉鐘,湯皎寧,古坤明,楊欽鵬;碳納米管分散性的研究[J];廣東化工;2005年04期

3 朱靖;劉洋;董振華;魏宏亮;楚暉娟;;多壁碳納米管接枝超支化聚(胺-酯)[J];化工進(jìn)展;2010年11期

4 朱立超,張志,高彥芳;原位聚合制備碳納米管/PMMA復(fù)合材料的研究[J];塑料工業(yè);2004年02期

5 萬(wàn)淼,黃新堂;低速球磨對(duì)多壁碳納米管球磨特性的影響研究[J];炭素技術(shù);2005年03期

6 孫靜,高濂,郭景坤;分散劑用量對(duì)幾種納米氧化鋯粉體尺寸表征的影響[J];無(wú)機(jī)材料學(xué)報(bào);1999年03期

7 江琳沁,高濂;化學(xué)處理對(duì)碳納米管分散性能的影響[J];無(wú)機(jī)材料學(xué)報(bào);2003年05期

8 曹東 ,周澤華 ,曾效舒;分散劑對(duì)陣列式碳納米管分散性的影響[J];新技術(shù)新工藝;2003年10期

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