本文選題：PA6 + Al_2O_3��； 參考：《合肥工業(yè)大學(xué)》2015年碩士論文

【摘要】：導(dǎo)熱絕緣高分子復(fù)合材料的開(kāi)發(fā)是解決當(dāng)前電子電器和LED燈具散熱的重要課題。基于很多文獻(xiàn)報(bào)道的導(dǎo)熱絕緣復(fù)合材料的力學(xué)性能或者熱導(dǎo)率不能滿足某些高要求場(chǎng)合的使用,本文以PA6為基體,Al2O3為導(dǎo)熱填料,采用雙螺桿擠出機(jī)制備了導(dǎo)熱絕緣復(fù)合材料。研究了Al2O3添加量和粒徑對(duì)復(fù)合材料的性能影響。結(jié)果表明：復(fù)合材料熱導(dǎo)率均隨著Al2O3添加量的增加而增大,但力學(xué)性能下降；Al2O3的填充量相同時(shí),Al2O3粒徑越大,PA6/Al2O3導(dǎo)熱絕緣復(fù)合材料熱導(dǎo)率越高,力學(xué)性能越差。當(dāng)Al2O3添加量為70 wt%時(shí),4μm、6μm、15μm和40μm Al2O3填充PA6復(fù)合材料的熱導(dǎo)率分別為1.213 W/(m·K), 1.268 W/(m·K),1.289 W/(m·K)和1.455 W/(m·K),而拉伸強(qiáng)度分別只有57.37MPa、53.77 Npa、52.12 MPa和49.5 MPa。為了改善復(fù)合材料的力學(xué)性能,本文以甲乙酮肟和異氰酸酯為原料,制備了一種封閉異氰酸酯硅烷,該物質(zhì)用作偶聯(lián)劑對(duì)Al2O3進(jìn)行表面改性,研究了該偶聯(lián)劑對(duì)PA6/Al2O3復(fù)合材料的性能影響。SEM結(jié)果表明該封閉異氰酸酯硅烷可以改善Al2O3在基體中分散,增強(qiáng)與基體的連接性;平衡扭矩和力學(xué)性能結(jié)果表明該封閉異氰酸酯硅烷在復(fù)合材料熔融加工過(guò)程中解封,與PA6鏈端氨基或羧基發(fā)生原位反應(yīng),起到擴(kuò)鏈劑的作用,改善了復(fù)合材料的力學(xué)性能；封閉異氰酸酯硅烷改性Al2O3/PA6復(fù)合材料的熱導(dǎo)率也較未改性有所提升。當(dāng)Al2O3的添加量增加到70 wt%時(shí),拉伸強(qiáng)度達(dá)到85.16 MPa,超過(guò)純PA6的拉伸強(qiáng)度；熱導(dǎo)率達(dá)到1.18 W/m·K,是PA6熱導(dǎo)率的3.83倍。綜合考慮復(fù)合材料的力學(xué)性能、熱導(dǎo)率和加工性能,將導(dǎo)熱填料的填充量確定為60 wt%,但該填充量下復(fù)合材料的熱導(dǎo)率較低。為了提高熱導(dǎo)率,本文采用大小粒徑Al2O3按不同的比例復(fù)配對(duì)PA6進(jìn)行填充,結(jié)果表明6μm和40μm Al2O3按質(zhì)量比1：1復(fù)配時(shí)復(fù)合材料的性能最佳。為了進(jìn)一步提高熱導(dǎo)率,我們采用上述最佳復(fù)配A1203再分別與AlN、BN和SiC三種高導(dǎo)熱填料制成復(fù)配填料填充PA6,研究高導(dǎo)熱填料的種類和添加量對(duì)復(fù)合材料性能的影響。最終得到力學(xué)性能和熱導(dǎo)率俱佳的導(dǎo)熱絕緣尼龍復(fù)合材料。
[Abstract]:The development of thermal insulating polymer composites is an important problem to solve the heat dissipation of electronic appliances and LED lamps. Based on the fact that the mechanical properties or thermal conductivity of thermal insulating composites reported in many literatures can not meet some high requirements, the thermal insulating composites were prepared by twin-screw extruder with PA6 as the matrix and Al _ 2O _ 3 as the thermal conductive filler. The effects of Al _ 2O _ 3 addition and particle size on the properties of composites were studied. The results show that the thermal conductivity of the composites increases with the increase of Al _ 2O _ 3 content, but the lower the mechanical properties are, the larger the particle size of Al _ 2O _ 3 is and the higher the thermal conductivity of PA6 / Al _ 2O _ 3 thermal insulation composites is, the worse the mechanical properties are. The thermal conductivity of PA6 composites filled with 40 渭 m Al _ 2O _ 3 is 1.213 W / (m K), 1.268 W / (m K) 1.289 W / (m K) and 1.455 W / (m K), respectively, while the tensile strength is 57.37 MPA, 53.77 nm, 52.12 MPA and 49.5 MPA, respectively, when the content of Al _ 2O _ 3 is 70 wt%, and 40 渭 m Al _ 2O _ 3-filled PA6 composites are 1.213 W / (m K), 1.268 W / (m K) and 1.455 W / (m K), respectively. In order to improve the mechanical properties of the composites, a sealed isocyanate silane was prepared from methyl ethyl ketone oxime and isocyanate, which was used as coupling agent for surface modification of Al _ 2O _ 3. The effect of the coupling agent on the properties of PA6 / Al _ 2O _ 3 composite was studied. SEM results showed that the sealing isocyanate silane could improve the dispersion of Al _ 2O _ 3 in the matrix and enhance the connectivity with the matrix. The results of equilibrium torque and mechanical properties show that the sealing isocyanate silane is unsealed during the melt processing of the composite, and then reacts in situ with the amino or carboxyl groups of the PA6 chain, which acts as a chain extender and improves the mechanical properties of the composite. The thermal conductivity of Al _ 2O _ 3 / PA _ 6 composite modified by blocked isocyanate silane was also improved. When the amount of Al _ 2O _ 3 was increased to 70 wt%, the tensile strength reached 85.16 MPA, which was higher than that of pure PA6, and the thermal conductivity reached 1.18 W / m K, 3.83 times of that of PA6. Considering the mechanical properties, thermal conductivity and processing properties of the composites, the filling amount of the thermal conductive fillers is determined to be 60 wts, but the thermal conductivity of the composites is relatively low. In order to improve the thermal conductivity, PA6 was filled with Al _ 2O _ 3 in different proportions. The results showed that the composite with 6 渭 m and 40 渭 m Al _ 2O _ 3 had the best properties when the mass ratio of 6 渭 m and 40 渭 m was 1:1. In order to further improve the thermal conductivity, the best composite A1203 was used to make PA6 filled with AlNNBNBN and sic respectively. The effects of the type and amount of high thermal conductivity fillers on the properties of composites were studied. Finally, thermal insulating nylon composites with good mechanical properties and thermal conductivity were obtained.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB332

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