【摘要】：首先將多壁碳納米管(p-MWCNTs)用混合濃酸氧化成羧基化MWCNTs(MWCNTs-COOH),然后與氯化亞砜(SOCl_2)反應(yīng)得酰氯化MWCNTs(MWCNTs-COCl);將9,10-二氫-9-氧雜-10-磷雜菲-10-氧化物(DOPO)與二乙醇胺(DEA)反應(yīng)制備DOPO的衍生物DHDOPO;再將DHDOPO與MWCNTs-COCl進(jìn)行接枝反應(yīng)得表面功能化的MWCNTs(MWCNTs-COO-DH);最后經(jīng)熔融共混法制備聚乳酸(PLA)/MWCNTs-COO-DH復(fù)合材料。用核磁共振氫譜和透射電子顯微鏡表征MWCNTs-COO-DH的結(jié)構(gòu)和微觀形貌;用電子萬能試驗(yàn)機(jī)、掃描電子顯微鏡、微型燃燒量熱計(jì)等測定PLA/MWCNTs-COO-DH復(fù)合材料的力學(xué)性能、沖擊斷面形貌、燃燒性能及殘?zhí)繉有蚊�。結(jié)果表明,實(shí)驗(yàn)成功合成了目標(biāo)產(chǎn)物DHDOPO,并將其接枝到MWCNTs表面形成了典型核-殼結(jié)構(gòu)的MWCNTs-COO-DH;適量的MWCNTs-COO-DH可均勻分散在PLA基體中形成良好的界面結(jié)合;質(zhì)量分?jǐn)?shù)為0.1%的MWCNTs-COO-DH可顯著提高PLA的力學(xué)性能,并能降低其可燃性和火災(zāi)危險(xiǎn)性。
[Abstract]:Multiwalled carbon nanotubes (p-MWCNTs) were oxidized to carboxylated MWCNTs (MWCNTs-COOH) with mixed concentrated acid, and then reacted with sulfoxide chloride (SOCl_2) to form acyl chlorinated MWCNTs (MWCNTs-COCl). Surface functionalized MWCNTs (MWCNTs-COO-DH) was prepared by grafting DHDOPO with MWCNTs-COCl and polylactic acid (PLA) / MWCNTs-COO-DH composite was prepared by melt blending method. The structure and microstructure of MWCNTs-COO-DH were characterized by nuclear magnetic resonance spectroscopy (NMR) and transmission electron microscope (TEM). The mechanical properties and impact section morphology of PLA/MWCNTs-COO-DH composites were measured by electronic universal testing machine, scanning electron microscope and micro combustion calorimeter. Combustion performance and residual carbon layer morphology. The results showed that the target product DHDOPOO was successfully synthesized and grafted onto the surface of MWCNTs to form a typical core-shell MWCNTs-COO-DH.The proper amount of MWCNTs-COO-DH could be uniformly dispersed in the PLA matrix to form a good interfacial bonding. MWCNTs-COO-DH with 0.1% mass fraction can significantly improve the mechanical properties of PLA and reduce its flammability and fire hazard.
【作者單位】： 天津科技大學(xué)化工與材料學(xué)院;天津出入境檢驗(yàn)檢疫局工業(yè)產(chǎn)品安全技術(shù)中心;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51102179) 天津市自然科學(xué)基金資助項(xiàng)目(14JCYBJC16800)
【分類號(hào)】：O633.14
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本文編號(hào)：2189488