【作者】 白晓刚；

【导师】 于剑锋； 王洪艳；

【作者基本信息】 吉林大学 ， 物理化学， 2004， 硕士

【摘要】 微孔塑料是一种新型的高分子材料。微孔的引入提高了高分子材料的压缩、拉伸、冲击、疲劳等力学性能和热稳定性，有效的降低了导热系数和介电系数。同时，微孔的存在使微孔材料重量轻，有效的降低了生产成本，有利于节约能源。目前，微孔塑料已成为材料研究领域的热点之一。多孔高密度聚乙烯微孔材料，因其良好的生物活性和组织相容性，已广泛的应用于耳修复、耳支架、脸部整形等多个医学材料方面。但多孔高密度聚乙烯微孔材料作为耳支架有过硬、弹性不足的缺点，限制了它的进一步使用。本文针对现有多孔高密度聚乙烯微孔材料的缺陷，采用超饱和气体法来代替原有的相分离方法来制备具有一定柔韧性、弹性的多孔高密度聚乙烯（Medpor）微孔材料。针对高密度聚乙烯的特性和超饱和气体法的特点，本文从以下几个方面进行了一系列的探索性工作。高密度聚乙烯柔韧性的改性针对现有高密度聚乙烯（HDPE）过硬、柔韧性不足的缺点。本文利用HDPE的特点及力学性能。采取与三元乙丙橡胶共混的方法，有效的改善了HDPE的柔韧性。氮气气氛下利用超饱和气体法制备多孔高密度聚乙烯微孔材料 在氮气气氛下，综合考虑到压力、温度、时间、配比四个因素对制备多孔高密度聚乙烯（Medpor）微孔材料的影响。并采用正交分析法，利用质量变化对试验的结果进行分析和判断。 <WP=58>二氧化碳气氛下利用超饱和气体法制备多孔高密度聚乙烯微孔材料 在二氧化碳气氛下，针对压力、温度时间、配比对利用超饱和气体法制备多孔高密度聚乙烯（Medpor）微孔材料的影响。采用正交试验的方法对试验进行设计和考察。运用质量变化率、电子显微镜和扫描电镜（SEM）技术，对微孔材料的形成从宏观和微观进行分析。最后，得出结论：在二氧化碳气氛下制备Medpor微孔材料比氮气气氛下更有利于微孔的形成。更多还原

【Abstract】 Microcellular plastic is a new kind of polymeric material.It can enhance the compressive behavior,tensile behavior,impact　behavior,fatigue-resistance and decrease thermal coefficient,dielectrometric constant.At the same time ,microcellular plastic decreased the weight of the polymer with numberous cell bubbles.So it can save energy through decreasing processing and transpoting costs.Today,microcellular materials had become a hot study in materials fields. With bioactive and　histocompatibility,Medpor had been widely used in ear reconstruction,auricle construction and face surgery.Were flexibility and elastic,Medpor had more widely used in ear stents.In order to overcome those defect ,super saturated gas technology was used to prepare the new kind of Medpor with flexibility ,high elastic behavior in this paper.According to the character of HDPE and super saturated gas technology ,a series of experiments had been designed. modification of HDPE’s flexibility This paper described the character of HDPE and it’s blended with EDPM in order to eliminate the flaw of HDPE being hard ,lower elastic.Use super saturated gas technology to prepare Medpor in nitrogen circumstance When using super saturated gas technology to prepare Medpor in nitrogen circumstance ,pressure ,temperature and proportion had immediate influence on manufacturing Medpor ,so orthogonal design method was used to analyse the experimental results.Use super saturated gas technology to manufacture Medpor in carbon dioxide circumstance. Using super saturated gas technology to prepare Medpor in carbon dioxide circumstance ,orthogonal experimental design had been used to deal with the results since pressure ,temperature ,time, proportion had direct effect <WP=60>on manufacturing micro porous materials.Through using mass retention ,electron microscope and scan electron microscope(SEM) to analyse the reason of cell dubbles’forming from macroscopic and microscope,the results indicated that it’s easier to form foams in carbon dioxide circumstance than that in nitrogen circumstance.更多还原