界面處理對材料導熱性能影響的研究
發(fā)布時間：2018-10-29 20:10
【摘要】：隨著科學技術(shù)的飛速發(fā)展,傳統(tǒng)導熱材料已不再適用于現(xiàn)代化工業(yè)產(chǎn)生需求。聚合物基高導熱材料因具有較高的導熱性能、良好的物理化學性能以及經(jīng)濟性等優(yōu)勢,在各領(lǐng)域特別是電子行業(yè)表現(xiàn)出廣闊的應用前景。但聚合物基體的導熱性能一般較差,目前提高該類材料導熱性能主要有三種方法:提高聚合物基體的導熱性能、在基體中填充具有高熱導率的填料以及改善基體與填料之間的界面結(jié)合狀態(tài)。本文主要從改善聚合物基導熱復合材料填料與聚合物基體的界面出發(fā),采用兩種表面處理方法對填料進行處理。第一種為偶聯(lián)劑處理以增加填料表面的親油性,改善填料與聚合物基體的相容性。本文選取KH-550、KH-560和KH-570對填料進行處理,研究了處理溶液的p H值、偶聯(lián)劑用量及偶聯(lián)劑水解時間對填料處理效果的影響。當溶液p H為5,偶聯(lián)劑用量為填料質(zhì)量分數(shù)的1.5%,水解時間為2 h時,填料與水之間的潤濕角顯著增加,所制備復合材料的熱導率最大。經(jīng)對比發(fā)現(xiàn),采用KH-560對填料進行處理的效果最優(yōu)。第二種方法為采用溶膠凝膠法,在填料表面包覆氧化鋅,制備核-殼結(jié)構(gòu),并研究了包覆濃度及煅燒溫度對填料處理效果的影響。當包覆濃度為1:5,煅燒溫度為800oC時,氧化鋅完全包覆在填料表面。包覆后填料與環(huán)氧樹脂的潤濕性得到改善,所制備復合材料的熱導率也得到了顯著提升。但與偶聯(lián)劑處理不同,雖然包覆氧化鋅一定程度上會改善填料與基體之間的潤濕性,但復合材料熱導率的增加主要是因為在材料中引入了具有更好導熱性能的組分。最后,對兩種方法處理所制備的導熱復合材料采用XRD、熱膨脹、動態(tài)力學性能及導熱性能進行測試。填料發(fā)生的晶格畸變、導熱復合材料熱膨脹系數(shù)的降低以及復合材料儲能模量及損耗模量的增加均表明填料與聚合物基體之間的界面結(jié)合得到了改善,但改善程度并不相同。復合材料熱導率測試表明,偶聯(lián)劑處理對提高材料的導熱性能效果有限,而在填料表面包覆具有更高熱導率的氧化鋅,隨著填料用量的增加,復合材料熱導率將顯著得到改善。兩種方法之間的差別與它們的機理密切相關(guān)。
[Abstract]:With the rapid development of science and technology, traditional thermal conductive materials are no longer suitable for modern industry. Because of its advantages of high thermal conductivity, good physical and chemical properties and economy, polymer based high thermal conductivity materials have broad application prospects in various fields, especially in electronic industry. However, the thermal conductivity of polymer matrix is generally poor. At present, there are three main ways to improve the thermal conductivity of this kind of material: to improve the thermal conductivity of polymer matrix, The filler with high thermal conductivity is filled in the matrix and the interfacial bonding between the matrix and the filler is improved. In this paper, two surface treatment methods are used to improve the interface between polymer matrix and polymer matrix. The first is coupling agent treatment to increase the lipophilicity of filler surface and improve the compatibility between filler and polymer matrix. In this paper, KH-550,KH-560 and KH-570 were selected to treat the filler. The effects of pH value of the treated solution, the amount of coupling agent and the hydrolysis time of the coupling agent on the treatment effect of the filler were studied. When pH of solution is 5, the amount of coupling agent is 1.5 of the mass fraction of filler and the hydrolysis time is 2 h, the wetting angle between filler and water increases significantly, and the thermal conductivity of the composites is the largest. By comparison, it was found that the effect of KH-560 on the treatment of fillers was the best. The second method is to prepare core-shell structure by coating zinc oxide on the surface of filler by sol-gel method. The effects of coating concentration and calcination temperature on the effect of filler treatment are studied. When the coating concentration is 1: 5 and the calcination temperature is 800oC, zinc oxide is completely coated on the filler surface. The wettability of the filler and epoxy resin was improved, and the thermal conductivity of the composites was also improved. However, different from the coupling agent treatment, the wettability between filler and matrix can be improved to some extent by coating with zinc oxide, but the increase of thermal conductivity of composites is mainly due to the introduction of better thermal conductivity components. Finally, the thermal expansion, dynamic mechanical properties and thermal conductivity of the composites prepared by the two methods were tested by XRD, thermal expansion, dynamic mechanical properties and thermal conductivity. The lattice distortion of filler, the decrease of thermal expansion coefficient and the increase of energy storage modulus and loss modulus of composites indicate that the interfacial bonding between filler and polymer matrix has been improved, but the improvement degree is not the same. The results of thermal conductivity test showed that the coupling agent treatment had limited effect on improving the thermal conductivity of the composites, while the thermal conductivity of the composites coated with zinc oxide with higher thermal conductivity on the filler surface would be improved significantly with the increase of filler content. The difference between the two methods is closely related to their mechanism.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB332
本文編號：2298685
[Abstract]:With the rapid development of science and technology, traditional thermal conductive materials are no longer suitable for modern industry. Because of its advantages of high thermal conductivity, good physical and chemical properties and economy, polymer based high thermal conductivity materials have broad application prospects in various fields, especially in electronic industry. However, the thermal conductivity of polymer matrix is generally poor. At present, there are three main ways to improve the thermal conductivity of this kind of material: to improve the thermal conductivity of polymer matrix, The filler with high thermal conductivity is filled in the matrix and the interfacial bonding between the matrix and the filler is improved. In this paper, two surface treatment methods are used to improve the interface between polymer matrix and polymer matrix. The first is coupling agent treatment to increase the lipophilicity of filler surface and improve the compatibility between filler and polymer matrix. In this paper, KH-550,KH-560 and KH-570 were selected to treat the filler. The effects of pH value of the treated solution, the amount of coupling agent and the hydrolysis time of the coupling agent on the treatment effect of the filler were studied. When pH of solution is 5, the amount of coupling agent is 1.5 of the mass fraction of filler and the hydrolysis time is 2 h, the wetting angle between filler and water increases significantly, and the thermal conductivity of the composites is the largest. By comparison, it was found that the effect of KH-560 on the treatment of fillers was the best. The second method is to prepare core-shell structure by coating zinc oxide on the surface of filler by sol-gel method. The effects of coating concentration and calcination temperature on the effect of filler treatment are studied. When the coating concentration is 1: 5 and the calcination temperature is 800oC, zinc oxide is completely coated on the filler surface. The wettability of the filler and epoxy resin was improved, and the thermal conductivity of the composites was also improved. However, different from the coupling agent treatment, the wettability between filler and matrix can be improved to some extent by coating with zinc oxide, but the increase of thermal conductivity of composites is mainly due to the introduction of better thermal conductivity components. Finally, the thermal expansion, dynamic mechanical properties and thermal conductivity of the composites prepared by the two methods were tested by XRD, thermal expansion, dynamic mechanical properties and thermal conductivity. The lattice distortion of filler, the decrease of thermal expansion coefficient and the increase of energy storage modulus and loss modulus of composites indicate that the interfacial bonding between filler and polymer matrix has been improved, but the improvement degree is not the same. The results of thermal conductivity test showed that the coupling agent treatment had limited effect on improving the thermal conductivity of the composites, while the thermal conductivity of the composites coated with zinc oxide with higher thermal conductivity on the filler surface would be improved significantly with the increase of filler content. The difference between the two methods is closely related to their mechanism.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB332
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