本文關(guān)鍵詞： 聚偏氟乙烯 碳纖維 碳納米管 密煉機(jī)轉(zhuǎn)子 數(shù)值模擬　出處：《華東理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：轉(zhuǎn)子構(gòu)型是影響混煉設(shè)備混煉特性的重要因素。本文針對(duì)一維碳材料(碳纖維、碳納米管)填充聚合物的制備,以提高填充改性復(fù)合材料性能為目標(biāo),探討密煉機(jī)轉(zhuǎn)子結(jié)構(gòu)和工藝條件對(duì)混合材料性能的影響。利用POLYFLOW軟件對(duì)密煉機(jī)疊片式轉(zhuǎn)子和螺旋角分別為67.5°和40°的新型高拉伸腰鼓形轉(zhuǎn)子的混煉流場(chǎng)特性與混煉過(guò)程進(jìn)行了模擬；并對(duì)其壓力、剪切速率的分布特點(diǎn)進(jìn)行了討論,對(duì)流場(chǎng)的解聚能力和分布混合能力及其影響因素進(jìn)行了分析。在此基礎(chǔ)上,采用上述3種轉(zhuǎn)子分別制備碳纖維、碳納米管填充聚偏氟乙烯復(fù)合材料,并對(duì)所獲得的復(fù)合材料的導(dǎo)電、導(dǎo)熱特性和機(jī)械性能進(jìn)行了表征,探討了流場(chǎng)特性對(duì)共混物微觀相疇特性、物理特性、機(jī)械性能的影響。研究得出以下結(jié)論：(1)疊片式轉(zhuǎn)子具有較強(qiáng)的剪切作用,有利于分散混合；而腰鼓形轉(zhuǎn)子混煉流場(chǎng)中拉伸流所占比例較高,有利于分布混合。疊片式轉(zhuǎn)子分散混合能力最強(qiáng),螺旋角為40°的腰鼓形轉(zhuǎn)子分布混合能力最強(qiáng)。(2)腰鼓形轉(zhuǎn)子混煉流場(chǎng)中較弱的剪切作用可以保留復(fù)合材料中較長(zhǎng)的碳纖維殘存長(zhǎng)度,其較強(qiáng)的分布混合能力有利于碳纖維在復(fù)合材料中均勻分布；采用螺旋角為40°的腰鼓形轉(zhuǎn)子制備的復(fù)合材料中碳纖維殘存平均長(zhǎng)度為435μm,較采用疊片式轉(zhuǎn)子長(zhǎng)257μm,拉伸強(qiáng)度高15MPa。(3)碳納米管改性復(fù)合材料制備實(shí)驗(yàn)表明較高的剪切作用有利于碳納米管在聚偏氟乙烯中的分散。采用疊片式轉(zhuǎn)子制得的復(fù)合材料中碳納米管分散效果最好,體系形成滲流網(wǎng)絡(luò),復(fù)合材料體積電阻率為106Ω-cm；而采用腰鼓形轉(zhuǎn)子制備的復(fù)合材料中碳納米管團(tuán)聚較明顯,體積電阻率為1014Ω·cm。
[Abstract]:Rotor configuration is an important factor affecting the mixing characteristics of mixing equipment. In this paper, the preparation of one-dimensional carbon materials (carbon fiber, carbon nanotubes) filled polymer, with the aim of improving the properties of filled modified composites. The effects of rotor structure and process conditions on the properties of mixing materials were discussed. The laminated rotor and the new type of high tensile waist drum with spiral angles of 67.5 擄and 40 擄were analyzed by POLYFLOW software. The mixing flow field characteristics and mixing process of the rotor are simulated. The distribution characteristics of pressure and shear rate were discussed, and the depolymerization ability, distribution and mixing ability of the flow field and its influencing factors were analyzed. On the basis of this, carbon fibers were prepared by the three kinds of rotors mentioned above. Carbon nanotubes were filled with polyvinylidene fluoride (PVDF) composites. The conductivity, thermal conductivity and mechanical properties of the composites were characterized. The effects of flow field characteristics on the microscopic phase domain and physical properties of the blends were discussed. The following conclusions are drawn: the laminated rotor has strong shear effect, which is favorable for dispersion and mixing. But the ratio of tensile flow in the mixing flow field of waist drum rotor is higher, which is favorable to distribution and mixing. The laminated rotor has the strongest dispersion and mixing ability. When the helical angle is 40 擄, the mixing ability of the waist drum rotor is the strongest. (2) the weak shear action in the mixing flow field of the waist drum rotor can retain the longer carbon fiber residual length in the composite material. Its strong distribution and mixing ability is beneficial to the uniform distribution of carbon fiber in the composites. The average residual length of carbon fiber is 435 渭 m, which is 257 渭 m longer than that of laminated rotor. High tensile strength 15MPa.f3). The experimental results of carbon nanotube modified composites show that higher shear action is beneficial to the dispersion of carbon nanotubes in polyvinylidene fluoride (PVDF), and the carbon nanotubes (CNTs) have the best dispersion effect in the composites prepared by laminated rotor. The percolation network was formed, and the volume resistivity of the composite was 106 惟 -cm. However, the carbon nanotube agglomeration was obvious in the composites prepared with a waist drum rotor, with a volume resistivity of 1014 惟 路cm ~ (-1).
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ342.742;TB33

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