微发泡聚丙烯复合材料发泡行为的调控技术研究
发布时间：2018-08-09 17:10
【摘要】：微孔发泡聚合物材料作为结构材料使用时,对强度和韧性要求较高,目前主要添加纤维增强相来提高其强度和韧性,国内外学者从界面行为和改性机理进行了大量的研究;可是对于发泡增强复合材料,发泡质量的调控对强度和韧性是需要解决的关键科学问题,一方面通过改善发泡质量有效抑制气相往增强相表面聚集,保持增强相本身的增强增韧效应;另一方面通过改善发泡质量实现细小而均匀的泡孔有利于提升其强度和韧性。因此,对于聚合物发泡增强复合材料来说,如何调控发泡质量实现增强相本身的增强增韧以及获得细小而均匀的泡孔尺寸对结构发泡材料制品的工业化应用具有非常重要的意义。本文选取三种典型纤维(AF、GF、CF)制备发泡PP/纤维复合材料,研究了纤维特性和纤维表面改性对微发泡聚丙烯复合材料发泡行为的影响机理。同时分析了加工工艺、复合发泡剂对发泡PP复合材料泡孔结构的调控作用机理。论文研究取得了以下主要成果:1.纤维可以有效改善微发泡PP材料的泡孔结构,改善效果CFGFAF,PP/CF发泡材料的泡孔直径为27.689μm,泡孔密度为8.67×106cells/cm3。添加未改性GF的发泡材料,其泡孔直径为29.67μm,泡孔密度为3.45×107cells/cm3,GF经表面处理后发泡材料的泡孔直径增大至42.56μm,泡孔密度减小至8.39×106cells/cm3,同时泡孔与GF分离的类型Ⅰ的比重增加,有效抑制了气相向GF表面聚集,提高了纤维的增强增韧效果。2.模温的升高,加剧了泡孔合并,从而导致泡孔直径增加,泡孔密度减少,同时与纯PP发泡材料相比,PP/GF发泡材料的“过发泡状态”延迟出现。3.释压速率越大,单位时间内的压力降越大,成核速率越高。随着释压速率的增大,泡孔直径从26.678μm减小至17.998μm,泡孔密度从1.41×107cell/cm3增大至4.66×107cell/cm3。4.湿法研磨法不适于制备AC/硅藻土复合发泡剂,采用溶液法成功制备了硅藻土/OBSH复合发泡剂,使OBSH发泡剂实现分子水平的分散,负载效果较好,负载量高。与OBSH发泡剂相比,硅藻土/OBSH复合发泡剂使得泡孔直径从275.47μm降低至176.45μm,泡孔密度从3.32×103cells/cm3增加至5.73×104cells/cm3。
[Abstract]:The strength and toughness of microcellular foamed polymer materials are very high when they are used as structural materials. At present, fiber reinforced phase is mainly added to improve their strength and toughness. However, for foaming reinforced composites, the control of foaming quality on strength and toughness is a key scientific problem to be solved. On the one hand, by improving the quality of foaming, the gas phase aggregation to the surface of the enhanced phase can be effectively inhibited. On the other hand, to improve the foaming quality, to achieve fine and uniform foam pores is beneficial to enhance its strength and toughness. So, for polymer foamed composites, How to control the foaming quality to realize the strengthening and toughening of the reinforcing phase and to obtain the fine and uniform size of the foam pore is of great significance for the industrial application of the structural foamed materials. In this paper, three kinds of typical fiber (AFG / CF) were selected to prepare foamed PP/ fiber composites. The effects of fiber properties and fiber surface modification on the foaming behavior of microfoamed polypropylene composites were studied. At the same time, the control mechanism of processing technology and compound foaming agent on foam structure of PP composite was analyzed. The main achievements of this paper are as follows: 1. 1. The fiber can effectively improve the cellular structure of the microfoamed PP material. The effect is that the diameter of the foamed PP / PP / CF foamed material is 27.689 渭 m and the cell density is 8.67 脳 10 ~ (6) cells / cm ~ (-3). The foam material with unmodified GF has a diameter of 29.67 渭 m, a density of 3.45 脳 10 ~ 7 cells / cm ~ (-3) GF. After surface treatment, the cell diameter of foamed material increases to 42.56 渭 m, the cell density decreases to 8.39 脳 10 ~ (6) cells / cm ~ (-3), and the proportion of foam pore and type 鈪，
本文编号：2174752
[Abstract]:The strength and toughness of microcellular foamed polymer materials are very high when they are used as structural materials. At present, fiber reinforced phase is mainly added to improve their strength and toughness. However, for foaming reinforced composites, the control of foaming quality on strength and toughness is a key scientific problem to be solved. On the one hand, by improving the quality of foaming, the gas phase aggregation to the surface of the enhanced phase can be effectively inhibited. On the other hand, to improve the foaming quality, to achieve fine and uniform foam pores is beneficial to enhance its strength and toughness. So, for polymer foamed composites, How to control the foaming quality to realize the strengthening and toughening of the reinforcing phase and to obtain the fine and uniform size of the foam pore is of great significance for the industrial application of the structural foamed materials. In this paper, three kinds of typical fiber (AFG / CF) were selected to prepare foamed PP/ fiber composites. The effects of fiber properties and fiber surface modification on the foaming behavior of microfoamed polypropylene composites were studied. At the same time, the control mechanism of processing technology and compound foaming agent on foam structure of PP composite was analyzed. The main achievements of this paper are as follows: 1. 1. The fiber can effectively improve the cellular structure of the microfoamed PP material. The effect is that the diameter of the foamed PP / PP / CF foamed material is 27.689 渭 m and the cell density is 8.67 脳 10 ~ (6) cells / cm ~ (-3). The foam material with unmodified GF has a diameter of 29.67 渭 m, a density of 3.45 脳 10 ~ 7 cells / cm ~ (-3) GF. After surface treatment, the cell diameter of foamed material increases to 42.56 渭 m, the cell density decreases to 8.39 脳 10 ~ (6) cells / cm ~ (-3), and the proportion of foam pore and type 鈪，
本文编号：2174752
本文链接：https://www.wllwen.com/kejilunwen/cailiaohuaxuelunwen/2174752.html
