三螺杆直接挤出制备PP/PA66原位微纤复合材料的工艺研究
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摘要
利用三角形排列三螺杆挤出机(TTSE)低温原位拉伸直接挤出制备了聚丙烯/聚己二酰己二胺(PP/PA66)原位微纤复合材料,用响应曲面分析法(RSM)研究了工艺参数如PA66含量、加工温度、剪切速率和喂料量对原位微纤复合材料微纤直径和长径比的影响。研究结果表明:加工工艺条件对PP/PA66微纤复合材料中的纤维直径和长径比影响很大,其中影响纤维长径比最显著的工艺参数是加工温度,其次是PA66含量;当加工温度为245℃,PA66质量分数为27%时,实验得到的PA66微纤直径在2~5μm之间,最大长径比接近210,且最优工艺下微纤长径比的实际值与理论值偏差为3.84%,说明该分析方法较为可靠。
In situ fibrillation polypropylene/poly( hexamethylene adipamide)( PP/PA66) composites have been prepared by using a triangle array triple-screw extruder( TTSE) at low temperatures. Response surface methodology was used to design the processing experiments and to analyze the effect of varying PA66 content,processing temperature,shear rate and feed rate on the diameter and aspect ratio of the resulting in situ microfibrils. The results revealed that the most important factor affecting the aspect ratio of the microfibrils is the processing temperature,followed by the PA66 content. The optimum,for preparing in situ microfibrils with maximum aspect ratio were found to be a temperature of processing factors 245 ℃ and a PA66 mass content of 27%. Under these processing conditions,in situ microfibrils with diameter 2 to 5 μm,and the maximum aspect ratio 210 were prepared. The deviation between the actual microfiber aspect ratio and the theoretical value under the optimal conditions was only 3. 84%,indicating that the analysis method is relatively reliable.
In situ fibrillation polypropylene/poly( hexamethylene adipamide)( PP/PA66) composites have been prepared by using a triangle array triple-screw extruder( TTSE) at low temperatures. Response surface methodology was used to design the processing experiments and to analyze the effect of varying PA66 content,processing temperature,shear rate and feed rate on the diameter and aspect ratio of the resulting in situ microfibrils. The results revealed that the most important factor affecting the aspect ratio of the microfibrils is the processing temperature,followed by the PA66 content. The optimum,for preparing in situ microfibrils with maximum aspect ratio were found to be a temperature of processing factors 245 ℃ and a PA66 mass content of 27%. Under these processing conditions,in situ microfibrils with diameter 2 to 5 μm,and the maximum aspect ratio 210 were prepared. The deviation between the actual microfiber aspect ratio and the theoretical value under the optimal conditions was only 3. 84%,indicating that the analysis method is relatively reliable.
引文
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[5]Jayanarayanan K,Thomas S,Joseph K.Morphology,static and dynamic mechanical properties of in situ microfibrillar composites based on polypropylene/poly(ethylene terephthalate)blends[J].Composites:Part A,2008,39(2):164-175.
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[9]Yang K X,Xin C L,Yu D Q,et al.Numerical simulation and experimental study of pressure and residence time distribution of triple-screw extruder[J].Polym Eng Sci,2015,55:156-162.
[10]Chen W,Wang W P,Zhang H S,et al.Optimization of ultrasonic-assisted extraction of water-soluble polysaccharides from Boletus edulis mycelia using response surface methodology[J].Carbohydrate Polymers,2012,87:614-619.
[11]Li M F,Xiao R,Sun G.Formation and morphology development of poly(butylene terephthalate)nanofibers from poly(butylene terephthalate)/cellulose acetate butyrate immiscible blends[J].Polym Eng Sci,2011,51:835-842.
[12]Schenone A V,Conte L O,Botta M A,et al.Modeling and optimization of photo-Fenton degradation of 2,4-D using ferrioxalate complex and response surface methodology(RSM)[J].Journal of Environmental Management,2015,155:177-183.
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