本文選題：聚醚醚酮 + 納米石墨微片��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：聚醚醚酮(PEEK)樹脂具備極其優(yōu)異的綜合性能，且適用于傳統(tǒng)熱塑性塑料的成型加工工藝，使其成為航空航天、能源化工、交通運輸、食品加工、醫(yī)療衛(wèi)生等領(lǐng)域的理想材料。聚醚醚酮作為耐磨材料，能在較廣的溫度、載荷、速度和接觸界面粗糙度范圍內(nèi)保持優(yōu)良的耐磨損性能，在聚合物摩擦材料領(lǐng)域顯示出非常廣闊的應(yīng)用前景。但是在干摩擦條件下，PEEK的摩擦系數(shù)較高，限制了PEEK在摩擦領(lǐng)域的應(yīng)用。納米石墨微片(GNS)作為一種典型的碳系材料，不但繼承了石墨低廉的價格、優(yōu)良的潤滑特性等優(yōu)點，還具有極高的徑厚比(直徑/厚度比)和超大的比表面積，使其成為了制備耐磨復(fù)合材料的理想填料。本論文以聚醚醚酮樹脂為基體材料，，納米石墨微片為主要填料，圍繞高性能聚醚醚酮基耐磨材料的制備展開一系列工作。 我們利用與聚醚醚酮綜合性能匹配的聚醚砜(PES)對GNS進行表面修飾，得到聚醚砜包覆的納米石墨微片(GNS@PES)，然后利用傳統(tǒng)的熔融共混的方式制備PEEK/GNS@PES和PEEK/GNS兩個系列復(fù)合材料，并對不同含量GNS填料的兩個系列復(fù)合材料的性能等進行了綜合的分析和對比。研究結(jié)果表明，GNS填料的引入提高了材料的力學(xué)性能、熱穩(wěn)定性、尺寸穩(wěn)定性以及摩擦磨損性能。由于填充材料表面的PES在GNS與PEEK樹脂之間形成了一個界面層，這個界面層不但能夠改善GNS在PEEK基體中的分散性，而且還能提高GNS與PEEK基體的界面作用力，這就使得PEEK/GNS@PES復(fù)合材料不論是力學(xué)性能還是摩擦磨損性能都要優(yōu)于PEEK/GNS復(fù)合材料。 對于聚合物基摩擦材料而言，良好的力學(xué)性能不但有助于提高摩擦性能，而且還能拓寬摩擦材料的應(yīng)用領(lǐng)域。碳纖維(CF)是一種性能卓越的增強材料，與聚合物復(fù)合后不但能夠賦予復(fù)合材料極高的強度、模量，還可以提高復(fù)合材料摩擦磨損性能�；诖宋覀儗⑻祭w維引入到PEEK/GNS@PES體系中，制備了PEEK/GNS@PES/CF三元復(fù)合材料。測試結(jié)果表明，與僅添加GNS@PES相比，碳纖維的引入顯著提高了復(fù)合材料的機械性能和摩擦磨損性能。 聚四氟乙烯(PTFE)具有特殊的螺旋形構(gòu)型，分子間易于滑移，同時氟原子構(gòu)成的外殼使得PTFE分子輪廓光滑，這既保證了PTFE能在滑動過程中展現(xiàn)出優(yōu)異的摩擦學(xué)性能，又能在摩擦接觸界面處形成穩(wěn)定且均勻的轉(zhuǎn)移膜，使其具有極低的摩擦系數(shù)。為了進一步降低聚醚醚酮基復(fù)合材料的摩擦系數(shù)，拓寬其應(yīng)用領(lǐng)域，我們固定碳纖維和GNS@PES的含量都為10wt%，將PTFE引入制備PEEK/GNS@PES/CF/PTFE四元復(fù)合材料。研究結(jié)果表明，四元復(fù)合材料的摩擦系數(shù)僅為0.254，PTFE的引入顯著降低了復(fù)合材料的摩擦系數(shù)。
[Abstract]:Polyether ether ketone (PEEK) resin has excellent comprehensive properties and is suitable for traditional thermoplastic molding process, which makes it an ideal material in aerospace, energy and chemical industry, transportation, food processing, medical treatment and so on. Polyether ether ketone, as a wear-resistant material, can maintain excellent wear resistance in a wide range of temperature, load, speed and contact interface roughness. However, the friction coefficient of peek is higher under dry friction condition, which limits the application of PEEK in friction field. As a typical carbon system material, nano-graphite microchip GNS not only inherits the advantages of low price of graphite and excellent lubricating properties, but also has extremely high diameter to thickness ratio (diameter / thickness ratio) and large specific surface area. It is an ideal filler for the preparation of wear-resistant composite materials. In this thesis, polyether ether ketone resin was used as matrix material and nano-graphite microchip was used as main filler to prepare high performance polyether ketone based wear resistant material. GNS was modified by polyethersulfone (PES), which was matched with polyether ether ketone (PES), and then PEEK/GNS@PES and PEEK/GNS composites were prepared by traditional melt blending method. The properties of two series composites with different GNS fillers were analyzed and compared. The results show that the mechanical properties, thermal stability, dimensional stability and friction and wear properties are improved with the introduction of GNS filler. Due to the formation of an interfacial layer between GNS and PEEK resin by PES on the surface of the filler material, this interfacial layer can not only improve the dispersion of GNS in PEEK matrix, but also enhance the interfacial force between GNS and PEEK matrix. Therefore, the mechanical properties and friction and wear properties of PEEK/GNS@PES composites are superior to those of PEEK/GNS composites. For polymer based friction materials, good mechanical properties can not only improve the friction properties, but also broaden the application of friction materials. Carbon fiber reinforced carbon fiber (CFC) is a kind of reinforced material with excellent properties. Composite with polymer can not only endow the composites with extremely high strength and modulus, but also improve the friction and wear properties of composites. Based on this, we introduce carbon fiber into PEEK/GNS@PES system and prepare PEEK/GNS@PES/CF ternary composites. The results show that the addition of carbon fiber can improve the mechanical properties and friction and wear properties of the composites compared with only adding GNS@PES. PTFE (PTFE) has a special spiral configuration, and it is easy to slip between molecules. Meanwhile, the shell made of fluorine atoms makes the PTFE molecule silhouette smooth, which ensures that PTFE can exhibit excellent tribological properties during the sliding process. A stable and uniform transfer film can be formed at the frictional contact interface, which makes it have a very low friction coefficient. In order to further reduce the friction coefficient of polyether ether ketone matrix composites and broaden their application fields, we fixed the content of carbon fiber and GNS@PES at 10 wts. we introduced PTFE into PEEK/GNS@PES/CF/PTFE quaternary composites. The results show that the friction coefficient of the quaternion composite is only 0.254% PTFE, and the friction coefficient of the composite is significantly reduced by the introduction of PTFE.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

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