【作者】 李鸿利；

【导师】 吴大鸣；

【作者基本信息】 北京化工大学 ， 材料加工工程， 2004， 硕士

【摘要】 近年来，纳米级填料复合泡沫塑料已迅速发展成现代塑料工业中重要的分支之一。由于它重量轻，隔热，隔音性能良好，以及良好的力学性能，得到广泛的应用。本文研究目的是利用原位气泡拉伸法(ISBS)制备纳米／高聚物复合材料，利用MathCAD软件模拟气泡振动，利用分形对纳米填料分散效果进行评定。 在前人已有的基础上，利用几个基本的气泡振动方程和MathCAD软件编程，对影响气泡振动的一些因素进行计算机模拟，来确定这些因素对气泡振动的影响程度。由振动方程和模拟得知，气泡振动在在气泡内外压力差和高聚物熔体的粘滞力、表面张力等共同作用下产生振动。本文对气泡内外压差、高聚物熔体的密度、表面张力、熔体粘度、松弛时间、熔体温度、气泡内气体种类、熔体温度、气泡体扩散系数、以及气泡初始半径、熔体压力等进行模拟，得出它们对气泡振动的影响。通过模拟得知，气泡振动的频率可以达到MHz，已经达到超声波的范围，所以原位气泡拉伸法中提出的利用气泡振动的超生作用对颗粒进行分散，在理论上完全可行。 分形是定量的描述不规则、随机的、非线性物理化学现象的工具。本文利用分形的这个特点，对原位气泡拉伸法制备的高聚物复合材料的分散效果进行定量分析。通过自建模型，对气泡周围颗粒的分散情况进行定量评定，利用随机分形模型对远离气泡区域的颗粒分散情况进行评定。更多还原

【Abstract】 In the near future, nano-filling complex foam plastics have quickly developed an important branch of plastics industry. For having excellent performance of light quality, isolated voice, isolated heat, mechanical capability, having got broad application. An object of the article is to study the manufacture of preparing nano/polymer composite material making use of An In Situ Bubble Bubble Stretching (ISBS) process. It simulates the bubble oscillation using the software of MathCAD, evaluates the disperse effect of nano-composite using fractal.On the basis of some studies carried out by former, using some basic oscillation equation and software of MathCAD, we have simulated the air bubble oscillation in computer in order to analyze the element to affect the bubble oscillation. From the oscillation equation and software , we got the element of difference press between inside bubble and outside(DPIO),the polymer visico-elasticity, surface tension, polymer density, to make the bubble oscillated .The Article has simulated the DPIO, polymer density, surface tension, polymer viscosity, polymer temperature, polymer press, material relax time, kind of gas, gas diffuse coefficient, original bubble radius, and so on, the outcome we got indicate the frequency of bubbleoscillation to reach to MHz, it has reach the range of ultrasonic .from that ,we can learn that the ISBS method about using ultrasonic to disperse the granules doing well just only in theory.Fractal is used to quantitative describe the interrupted, stochastic, nonlinear physical and chemic phenomena. The article uses the fractal peculiarity to analyze the granules disperse quality nano/polymer composite using ISBS. We make a fractal mathematical model, to analyze the granules disperse which are close to bubble .using random fractal to analyze the granules disperse which is far away bubble.更多还原