本文選題：氮化硼　切入點(diǎn)：氧化鋁　出處：《哈爾濱理工大學(xué)》2015年碩士論文

【摘要】：因納米粒子在改善聚合物力學(xué)性能和導(dǎo)熱性能上的顯著作用，導(dǎo)熱聚合物基納米復(fù)合材料的研究受到了廣泛關(guān)注。本論文采用氮化硼(BN)、納米氧化鋁(Al2O3)為導(dǎo)熱填料，以聚乙烯(PE)和乙烯-醋酸乙烯酯共聚物(EVA)為基體樹脂，通過(guò)熔融共混法制備導(dǎo)熱復(fù)合材料。論文在兩相連續(xù)模型理論預(yù)測(cè)了PE/EVA共混物的相轉(zhuǎn)變區(qū)域的基礎(chǔ)上，利用溶劑選擇萃取和掃描電子顯微鏡(SEM)研究了PE/EVA共混物的形貌結(jié)構(gòu)，而獲得了具有兩相共連續(xù)結(jié)構(gòu)的共混物，基于此，分別研究了BN、Al2O3在兩相中的分布行為，評(píng)價(jià)了復(fù)合材料的導(dǎo)熱性能和拉伸性能，，探討了無(wú)機(jī)納米粒子的選擇分布行為與復(fù)合材料導(dǎo)熱性能的關(guān)系。 研究結(jié)果表明：(1) PE/EVA共混物的相結(jié)構(gòu)與二者的用量比相關(guān)，根據(jù)兩相共連續(xù)模型計(jì)算得到相轉(zhuǎn)變點(diǎn)出現(xiàn)在PE的質(zhì)量分?jǐn)?shù)為51.8%附近，與實(shí)際實(shí)驗(yàn)結(jié)果相符，相結(jié)構(gòu)研究表明在PE/EVA質(zhì)量比為1/1時(shí)得到具有兩相共連續(xù)結(jié)構(gòu)的共混物；(2)無(wú)機(jī)粒子在兩相共連續(xù)PE/EVA共混物中呈現(xiàn)出選擇性分布行為，BN和Al2O3主要分布在PE相中，并與EVA相形成共連續(xù)結(jié)構(gòu)；(3)無(wú)機(jī)納米粒子的選擇分布及其共連續(xù)結(jié)構(gòu)有助于提高復(fù)合材料的導(dǎo)熱性能，在BN質(zhì)量分?jǐn)?shù)為30%時(shí)，與PE/BN復(fù)合材料相比，具有選擇分布和相連續(xù)結(jié)構(gòu)的PE/EVA/BN復(fù)合材料的熱導(dǎo)率提高了15.4%；在Al2O3質(zhì)量分?jǐn)?shù)為50%時(shí)，與PE/Al2O3復(fù)合材料相比，具有選擇分布和相連續(xù)結(jié)構(gòu)的PE/EVA/Al2O3復(fù)合材料的熱導(dǎo)率提高了20.9%；(4)隨著納米粒子填充量的增加，PE/EVA/BN、PE/EVA/Al2O3復(fù)合材料的拉伸強(qiáng)度分別與PE/BN、PE/Al2O3復(fù)合材料相近，同時(shí)由于EVA相的增韌作用，斷裂伸長(zhǎng)率分別優(yōu)于PE/BN復(fù)合材料與PE/Al2O3復(fù)合材料。
[Abstract]:Because of the remarkable effect of nano-particles on improving the mechanical and thermal conductivity of polymer, the research of thermal conductivity polymer matrix nanocomposites has been paid more and more attention.In this paper, the thermal conductivity composites were prepared by melt blending method using boron nitride (BNN), nano-alumina (Al _ 2O _ 3) as thermal conductive filler, polyethylene (PE) and vinyl acetate copolymer (EVA) as matrix resin.On the basis of predicting the phase transition region of PE/EVA blends based on two-phase continuum model theory, the morphology and structure of PE/EVA blends were studied by solvent selective extraction and scanning electron microscopy (SEM), and the blends with two-phase continuous structure were obtained.Based on this, the distribution behavior of BN- Al _ 2O _ 3 in two phases was studied, the thermal conductivity and tensile properties of the composites were evaluated, and the relationship between the selective distribution behavior of inorganic nanoparticles and the thermal conductivity of the composites was discussed.The results show that the phase structure of PE/EVA blends is related to their dosage ratio. According to the two-phase continuous model, the phase transition point appears in the range of 51.8% of PE, which is consistent with the experimental results.The study of phase structure shows that when the mass ratio of PE/EVA is 1 / 1, the blends with two-phase contiguous structure can be obtained. The inorganic particles exhibit selective distribution behavior in the two-phase continuous PE/EVA blends. BN and Al2O3 are mainly distributed in the PE phase.The selection and distribution of inorganic nanoparticles with EVA phase and their contiguous structure are helpful to improve the thermal conductivity of the composites. When the BN content is 30wt%, compared with the PE/BN composites,The thermal conductivity of PE/EVA/BN composites with selective distribution and phase continuous structure was increased by 15.40.When the mass fraction of Al2O3 was 50, the thermal conductivity of PE/Al2O3 composites was higher than that of PE/Al2O3 composites.The thermal conductivity of PE/EVA/Al2O3 composites with selective distribution and continuous phase structure increased by 20.90.The tensile strength of PEP / EVA- / EVA- Al _ 2O _ 3 composites was similar to that of PE- / BNN-PE-Al _ 2O _ 3 composites with the increase of the amount of nano-particles filled, and the toughening effect of EVA phase was also observed.The elongation at break is better than that of PE/BN and PE/Al2O3 respectively.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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