双连续相导热复合材料制备工艺研究
发布时间：2019-06-04 02:26
【摘要】：本文通过实验的方法,研究了将双连续相形态高聚物作为基体时,此种导热材料的形成条件和制备工艺。与此同时,研究了组分比和导热微粒添加量等因素对共混高聚物相态结构、各项性能的影响。通过实验研究来对比分析的方法,然后,对具有特殊双连续相结构的多层叠加复合导热高聚物进行实验探究。对比分析组分比和导热微粒添加量等因素对复合高聚物各项性能的影响程度。最后,通过三维建模模拟仿真和实验探究的方法,研究了利用导热高聚物材料作为加工原料,制备全塑CPU散热器的可行性,探究了翅片上带有的微结构和原材料的导热系数等因素对翅片散热能力的影响。结果表明：1、PP/HIPS共混高聚物的双连续相形态存在于HIPS质量分数在40-60wt%之间。复合材料中两种高聚物的组分含量,对共混高聚物的相态形式的影响是非常显著的。通过分析溶剂萃取实验得到的连续相系数变化图,同样说明HIPS含量在40%-60%的范围内,体系中的两相形成相互贯穿的双连续相形态即海-海形结构。2、高聚物的力学性能可以用来判断高聚物的相态形式。通过分析拉伸强度与HIPS含量的关系曲线,发现共混材料在HIPS含量在30%-60%附近形成双连续相结构。然后,继续分析弯曲强度、冲击强度两种力学性能与HIPS含量关系曲线,发现HIPS含量在30%一70%范围内时,共混材料在此范围内形成了双连续相结构。共混高聚物的熔体流动速率与HIPS含量有很大的关系,当HIPS含量逐渐增多时,熔体流动速率首先是逐渐变大的,到达一定程度后,又变为逐渐减小。两种材料进行共混,特别是HIPS的含量在30%-60%的范围内,有利于材料的成型加工。3、共混材料里AlN填料是填充在PP中的,并通过EDS验证了A1N分布在PP中。通过对PP-AIN/HIPS复合材料的电镜照片进行分析,发现双连续相结构存在于HIPS质量分数在40-55wt%之间。在复合高聚物中添加A1N导热微粒后,双连续相形式的实现范围变小。通过分析溶剂萃取实验得到的连续相系数曲线,其结果同样证明在复合材料中加入A1N导热填料后,形成双连续相结构的范围变小。连续性较好的双连续相形态存在于HIPS的质量含量为40%-55%范围内。4、两种高聚物多层叠加形式的材料拉伸性能优于同组分的共混材料。实验发现随着层数的增多,多层叠加形式高聚物的拉伸性能会不断变好。当多层叠加形式与普通共混高聚物的组分比均是PP-石墨/HIPS=3/7时,多层叠加高聚物层数对其导热能力的影响很小。多层叠加高聚物的导热能力优于普通共混高聚物,且发现其导热系数基本满足于其计算公式所得到的结果。多层叠加高聚物的拉伸性能优于普通共混高聚物,多层复合材料在特定方向上导热性能优异,而共混材料则在三维方向上导热性能基本是各向同性的。5、带有结构的CPU散热器翅片,散热能力显著优于没有结构的平板翅片。各种微结构翅片的散热能力大小依次是矩形微结构翅片最优,其次是半圆微结构翅片,然后是三角形微结构翅片。当矩形结构高度是0.4mm,宽度是0.5mm时,微结构之间的距离为0.5mm时,翅片的散热能力较好。高聚物的导热系数小于8 W·(m·K)-1时,随着高聚物导热系数的增大,CPU的最高温度降低迅速；当高聚物的导热系数超过8 W·(m·K)-1后,随着高聚物导热系数的不断变大,CPU最高温度减小并不明显。加工散热器翅片的导热高聚物材料的导热系数选择在8W·(m·K)-1附近时,翅片可以达到较好的散热性能。
[Abstract]:In this paper, the forming conditions and the preparation process of the heat-conducting material are studied by the method of the experiment. At the same time, the influence of the component ratio and the addition of the heat-conductive particles on the phase structure and various properties of the blended polymer was studied. In this paper, the method of comparative analysis is carried out by experimental research, and then the multi-layer superposed composite heat-conducting polymer with special double-continuous phase structure is investigated. The influence of the component ratio and the addition of the heat-conductive particles on the properties of the composite polymer was compared. Finally, by means of three-dimensional modeling and simulation and experimental investigation, the feasibility of using the heat-conductive high-polymer material as a raw material to prepare the whole-plastic CPU radiator is studied, and the influence of the factors such as the microstructure on the fins and the thermal conductivity of the raw materials on the heat radiation ability of the fins is investigated. The results show that the double-continuous phase morphology of 1, PP/ HIPS blend is in the range of 40-60 wt%. The effect of the component content of the two polymers in the composite is very significant. Through the analysis of the change of the continuous phase coefficient obtained by the solvent extraction experiment, it is also explained that the content of the HIPS is in the range of 40% to 60%, and the two phases in the system form a two-continuous phase, that is, the sea-sea-shaped structure which is penetrated by the two phases, and the mechanical property of the high polymer can be used to judge the phase state of the high polymer. Through the analysis of the relationship between the tensile strength and the HIPS content, the double-continuous phase structure was found to be in the vicinity of 30% to 60% of the HIPS content. Then, the relationship between the mechanical properties of the bending strength and the impact strength and the HIPS content was analyzed, and the content of HIPS was found to be within the range of 30% to 70%. The melt flow rate of the blended polymer has a great relationship with the HIPS content, and when the HIPS content is increasing, the melt flow rate is gradually increased, reaching a certain degree, and gradually decreasing. The blending of the two materials, in particular the content of HIPS in the range of 30% to 60%, is beneficial to the forming and processing of the material. Through the analysis of the electron microscope photograph of the PP-AIN/ HIPS composite, it is found that the double-continuous phase structure is in the range of 40-55 wt% of the HIPS. After the addition of the A1N heat-conducting particles in the composite polymer, the implementation range of the two continuous phase forms is small. Through the analysis of the continuous phase coefficient curve from the solvent extraction experiment, the results also show that after the A1N heat-conducting filler is added into the composite material, the range of forming the double-continuous phase structure is reduced. The two continuous phase forms with good continuity exist in the range of 40% -55% of the HIPS. The experimental results show that, with the increase of the number of layers, the tensile properties of the high polymer in the multi-layer superimposed form will be better. When the component ratio of the multi-layer superimposed polymer and the common blend is PP-graphite/ HIPS = 3/7, the effect of the number of layers on the thermal conductivity of the multi-layer stacked polymer is very small. The thermal conductivity of the multi-layer superimposed polymer is superior to that of the common blended polymer, and the thermal conductivity of the high polymer is found to be basically satisfied with the results obtained by the calculation formula. the tensile property of the multi-layer composite polymer is superior to that of the common blended polymer, the thermal conductivity of the multi-layer composite material in a specific direction can be excellent, and the blend material can be basically isotropic in the three-dimensional direction, The heat dissipation capability is obviously better than that of the flat plate with no structure. The heat dissipation capacity of the various microstructure fins is in turn the optimal of the rectangular microstructure fins, and the second is a semi-circular microstructure fin, and then is a triangular micro-structured fin. When the height of the rectangular structure is 0.4 mm and the width is 0.5 mm, the heat dissipation capacity of the fins is good when the distance between the microstructures is 0.5 mm. When the thermal conductivity of the high polymer is less than 8W 路 (m 路 K) -1, with the increase of the thermal conductivity of the high polymer, the maximum temperature of the CPU is reduced rapidly; when the thermal conductivity of the high polymer exceeds 8 W 路 (m 路 K) -1, the thermal conductivity of the high polymer increases continuously. The maximum CPU temperature is not significant. When the heat-conducting coefficient of the heat-conducting high-polymer material for processing the radiator fins is selected to be around 8W 路 (m 路 K) -1, the fins can achieve better heat-dissipation performance.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
[Abstract]:In this paper, the forming conditions and the preparation process of the heat-conducting material are studied by the method of the experiment. At the same time, the influence of the component ratio and the addition of the heat-conductive particles on the phase structure and various properties of the blended polymer was studied. In this paper, the method of comparative analysis is carried out by experimental research, and then the multi-layer superposed composite heat-conducting polymer with special double-continuous phase structure is investigated. The influence of the component ratio and the addition of the heat-conductive particles on the properties of the composite polymer was compared. Finally, by means of three-dimensional modeling and simulation and experimental investigation, the feasibility of using the heat-conductive high-polymer material as a raw material to prepare the whole-plastic CPU radiator is studied, and the influence of the factors such as the microstructure on the fins and the thermal conductivity of the raw materials on the heat radiation ability of the fins is investigated. The results show that the double-continuous phase morphology of 1, PP/ HIPS blend is in the range of 40-60 wt%. The effect of the component content of the two polymers in the composite is very significant. Through the analysis of the change of the continuous phase coefficient obtained by the solvent extraction experiment, it is also explained that the content of the HIPS is in the range of 40% to 60%, and the two phases in the system form a two-continuous phase, that is, the sea-sea-shaped structure which is penetrated by the two phases, and the mechanical property of the high polymer can be used to judge the phase state of the high polymer. Through the analysis of the relationship between the tensile strength and the HIPS content, the double-continuous phase structure was found to be in the vicinity of 30% to 60% of the HIPS content. Then, the relationship between the mechanical properties of the bending strength and the impact strength and the HIPS content was analyzed, and the content of HIPS was found to be within the range of 30% to 70%. The melt flow rate of the blended polymer has a great relationship with the HIPS content, and when the HIPS content is increasing, the melt flow rate is gradually increased, reaching a certain degree, and gradually decreasing. The blending of the two materials, in particular the content of HIPS in the range of 30% to 60%, is beneficial to the forming and processing of the material. Through the analysis of the electron microscope photograph of the PP-AIN/ HIPS composite, it is found that the double-continuous phase structure is in the range of 40-55 wt% of the HIPS. After the addition of the A1N heat-conducting particles in the composite polymer, the implementation range of the two continuous phase forms is small. Through the analysis of the continuous phase coefficient curve from the solvent extraction experiment, the results also show that after the A1N heat-conducting filler is added into the composite material, the range of forming the double-continuous phase structure is reduced. The two continuous phase forms with good continuity exist in the range of 40% -55% of the HIPS. The experimental results show that, with the increase of the number of layers, the tensile properties of the high polymer in the multi-layer superimposed form will be better. When the component ratio of the multi-layer superimposed polymer and the common blend is PP-graphite/ HIPS = 3/7, the effect of the number of layers on the thermal conductivity of the multi-layer stacked polymer is very small. The thermal conductivity of the multi-layer superimposed polymer is superior to that of the common blended polymer, and the thermal conductivity of the high polymer is found to be basically satisfied with the results obtained by the calculation formula. the tensile property of the multi-layer composite polymer is superior to that of the common blended polymer, the thermal conductivity of the multi-layer composite material in a specific direction can be excellent, and the blend material can be basically isotropic in the three-dimensional direction, The heat dissipation capability is obviously better than that of the flat plate with no structure. The heat dissipation capacity of the various microstructure fins is in turn the optimal of the rectangular microstructure fins, and the second is a semi-circular microstructure fin, and then is a triangular micro-structured fin. When the height of the rectangular structure is 0.4 mm and the width is 0.5 mm, the heat dissipation capacity of the fins is good when the distance between the microstructures is 0.5 mm. When the thermal conductivity of the high polymer is less than 8W 路 (m 路 K) -1, with the increase of the thermal conductivity of the high polymer, the maximum temperature of the CPU is reduced rapidly; when the thermal conductivity of the high polymer exceeds 8 W 路 (m 路 K) -1, the thermal conductivity of the high polymer increases continuously. The maximum CPU temperature is not significant. When the heat-conducting coefficient of the heat-conducting high-polymer material for processing the radiator fins is selected to be around 8W 路 (m 路 K) -1, the fins can achieve better heat-dissipation performance.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
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