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添加成核剂是一种有效的聚丙烯改性方法。聚丙烯成核剂可使聚丙烯结晶度增加、结晶细微化,提高其机械性能等。本文通过介绍聚丙烯成核剂的种类,特性,浅析了成核剂在聚丙烯中作用及其发展。 相似文献
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介绍了聚丙烯成核荆成核功能、分类。以山梨醇类成核剂为重点对国内外聚丙烯成核剂的合成研究开发情况进行了介绍,并对本公司聚丙烯成核剂的合成工艺进行了简述。 相似文献
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聚丙烯成核剂的现状与发展趋势 总被引:1,自引:0,他引:1
综述了国内外聚丙烯成核剂的发展状况,介绍了聚丙烯成核剂的种类、产品、新品种和最新研制进展,提出了今后发展方向是研究开发复合型、β晶型、聚合物类以及山梨醇衍生物类成核剂. 相似文献
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研究了4种有机磷酸盐类成核剂对聚丙烯性能的影响。结果表明,这几种有机磷酸盐类成核剂可以有效地改善聚丙烯性能,制得高强度、高耐热透明聚丙烯。合成的有机磷酸盐类成核剂应用效果良好。 相似文献
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Li Bing Zhou Nanqiao Ming-Yi Wang Ping Zhang 《Polymer-Plastics Technology and Engineering》2013,52(10):1054-1060
A novel microcellular processing experimental setup was developed in which various nucleation agents were added to foaming material (Polystyrene). The effect of the nucleation agents on cell morphology of foam plastics was studied in the vibration field. The effects of the processing conditions such as nucleating agents, particle size of the nucleating agents, content of the nucleating agents, and the vibration parameters on polystyrene cell morphology were investigated. The cell morphology was analyzed with a scanning electron microscope. The results showed that the samples blown with nucleating agents, in general, had larger cell density and much smaller cell size than the ones without nucleating agents. It is believed that the smaller nucleating agents will be helpful for the larger bubble densities and the smaller cell size. There is the optimum content range for the maximum bubble densities and the minimum average cell diameter in foaming processing with nucleating agents. In the range of vibration parameter, the cell density increases with an increase of frequency and amplitude, and the cell size is the reverse. 相似文献
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Ideal nucleating agents are expected to improve the cell morphology of plastics foams (i.e., increasing the cell density, reducing the cell size, and narrowing cell-size distribution) by providing heterogeneous nucleation sites. A nucleating agent's surface geometry is one factor that governs its nucleating power. This paper discusses the surface geometry of an ideal nucleating agent. On the basis of computer simulations of a batch foaming process using polystyrene and carbon dioxide, we found that nucleating agents having numerous crevices with small semiconical angles are the most desirable for polymeric foaming processes. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008 相似文献
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透明聚丙烯成核剂的种类及其应用 总被引:1,自引:0,他引:1
介绍了无机类透明成核剂、有机类透明成核剂(芳基磷酸盐、山梨醇类、羧酸金属盐、脱氢枞酸及其盐类、支化酰胺类化合物)和聚合物型透明成核剂的主要品种、特点、在聚丙烯中的成核机理及其对聚丙烯性能的影响。 相似文献
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复合成核剂对PET结晶速率和特性黏数的影响 总被引:1,自引:0,他引:1
采用差示扫描量热分析仪和乌氏黏度计研究了不同成核剂及其复配对聚对苯二甲酸乙二醇酯(PET)结晶速率和特性黏数的影响。结果表明,复合成核剂对于提高PET成核结晶速率[半结晶时间(t1/2)为32.3~45.3 s]的效果优于单一成核剂(t1/2为42.9~57.9 s);同时部分复合成核剂能有效减小PET特性黏数的降低幅度。 相似文献