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  本文選題：天然橡膠　切入點：碳納米管　出處：《青島科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,導(dǎo)熱橡膠受到廣泛關(guān)注,并取得了可觀的研究成果。隨著現(xiàn)代科技的發(fā)展,人們對導(dǎo)熱橡膠性能、制備、多樣性等提出了更多苛刻的要求。本課題首先探究了交聯(lián)密度對天然橡膠熱導(dǎo)率的影響,通過改變助劑的用量,控制橡膠的交聯(lián)密度和熱導(dǎo)率。研究發(fā)現(xiàn)分子鏈的緊密度和活動能力共同影響著天然橡膠的熱導(dǎo)率,兩方面相互制約,又共同對熱導(dǎo)率的提高有促進(jìn)作用,較低溫度時分子鏈運動性能起主導(dǎo)作用,較高溫度時分子鏈緊密度起主導(dǎo)作用。然后采用不同的共混工藝制備碳納米管填充天然橡膠復(fù)合材料,研究碳納米管對天然橡膠導(dǎo)熱性能的影響。研究表明：在機(jī)械共混中,隨碳納米管用量的增加,天然橡膠熱導(dǎo)率穩(wěn)步上升,填充份數(shù)為12vo1%時,熱導(dǎo)率隨溫度在0.224W/(m·K)到0.242W/(m·K)之間變化。天然膠的拉伸強(qiáng)度隨著碳納米管填充量的增加先上升后下降,在6vol%時達(dá)到最大值,拉斷伸長率不斷下降。管長越長、管徑越大的普通碳納米管對天然橡膠的導(dǎo)熱和機(jī)械補(bǔ)強(qiáng)作用更加明顯,而A-MWNT能明顯提高天然橡膠的熱導(dǎo)率,但機(jī)械補(bǔ)強(qiáng)作用非常差。通過溶液共混工藝將磁化碳納米管填充到天然橡膠中,在磁場作用下制備磁定向碳納米管天然橡膠復(fù)合材料。磁化碳納米管的包覆率越大,在磁場中受到的力越大,定向越徹底,復(fù)合材料熱導(dǎo)率越高。碳納米管用量的增加有助于提高橡膠熱導(dǎo)率,當(dāng)用量超過8vol%時,橡膠熱導(dǎo)率上升迅速。較大的磁場強(qiáng)度有助于提高磁化碳納米管的順磁定向,提高材料熱導(dǎo)率,但當(dāng)磁場過大時,磁化碳納米管受到磁場吸引發(fā)生移動造成分布不均現(xiàn)象,會降低熱導(dǎo)率。磁場角度越接近熱導(dǎo)率檢測角度,天然橡膠熱導(dǎo)率越大,當(dāng)磁場與檢測方向垂直時,熱導(dǎo)率最小,且當(dāng)磁場與檢測方向角度大于45°時,熱導(dǎo)率小于未定向的碳納米管天然橡膠復(fù)合材料。
[Abstract]:In recent years, thermal conductive rubber has received extensive attention, and has made considerable research results. With the development of modern science and technology, the properties and preparation of thermal conductive rubber have been studied. In this paper, the influence of crosslinking density on the thermal conductivity of natural rubber was investigated, and the amount of additives was changed. It is found that the density and activity of molecular chains affect the thermal conductivity of natural rubber together, and both of them restrict each other and promote the increase of thermal conductivity. Molecular chain movement at lower temperature and molecular chain tightness at higher temperature play a leading role. Then carbon nanotube filled natural rubber composites are prepared by different blending processes. The effect of carbon nanotubes on the thermal conductivity of natural rubber was studied. The results showed that the thermal conductivity of natural rubber increased steadily with the increase of carbon nanotube content in mechanical blending, and the filling fraction was 12vo1%. The thermal conductivity varies from 0.224 W / m 路K) to 0.242 W / m 路K). The tensile strength of natural rubber increases first and then decreases with the increase of carbon nanotube filling, and reaches its maximum value at 6vol%, and the elongation at break decreases continuously. The longer the tube is, the longer the length of the tube is. The larger the diameter of carbon nanotubes, the more obvious the thermal conductivity and mechanical reinforcement of natural rubber, while A-MWNT can significantly improve the thermal conductivity of natural rubber. But the mechanical reinforcement is very poor. Magnetized carbon nanotubes (MCNTs) are filled into natural rubber by solution blending process, and magnetically oriented CNTs are prepared by magnetic field. The higher the coating rate of magnetized CNTs is, The greater the force in the magnetic field, the more thorough the orientation, the higher the thermal conductivity of the composite. The increase of carbon nanotube content is helpful to increase the thermal conductivity of rubber, when the amount of carbon nanotube is more than 8vol%, The large magnetic field intensity is helpful to improve the paramagnetic orientation of magnetized carbon nanotubes and increase the thermal conductivity of the materials. However, when the magnetic field is too large, the magnetic field attraction of the magnetized carbon nanotubes will lead to the uneven distribution of the magnetized carbon nanotubes. The closer the angle of magnetic field is to the angle of thermal conductivity detection, the greater the thermal conductivity of natural rubber is. When the magnetic field is perpendicular to the direction of detection, the thermal conductivity is the least, and when the angle of magnetic field and detection direction is greater than 45 擄, Carbon nanotube natural rubber composites with thermal conductivity less than undetermined direction.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

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相關(guān)期刊論文 前1條

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本文編號：1597584