黏度比对EVA/PP原位微纤复合材料形态及性能的影响
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摘要
采用熔融挤出-微纳叠层共挤制备了不同黏度比的乙烯-醋酸乙烯酯共聚物(EVA)/聚丙烯(PP)原位微纤复合材料,通过扫描电子显微镜(SEM)、差示扫描量热仪(DSC)和微机控制电子万能试验机研究了EVA/PP原位微纤复合材料中黏度比对分散相形态的影响,分散相尺寸对复合材料结晶行为、熔融温度以及拉伸强度的影响。结果表明:黏度比增加,分散相PP更易形成大长径比微纤,从而改善分散相与基体相界面相容性,改善复合材料结晶行为,增加结晶度,提高EVA/PP原位微纤复合材料拉伸强度。
The in situ microfibillar composites with different viscosity ratios of EVA to PP were prepared by melt extrusion-micro-nano laminated co-extrusion. The effect of viscosity ratio on the dispersed phase morphology was studied. The effect of dispersed phase size on the crystallization behavior, melting temperature,tensile strength of composites was explored. Scanning electron microscope( SEM),differential scanning calorimeter( DSC) and microcomputer control electronic universal testing machine were adopted.The results show that the PP dispersed phase is more likely to form microfibillar with large aspect ratio,along with the viscosity ratio increases. As a result,the interface compatibility between disperse phase and matrix phase is improved. At the same time,the crystallization behavior of composites becomes favorable and the degree of crystallinity increases. The tensile strength of EVA/PP in situ microfibillar composite is improved.
The in situ microfibillar composites with different viscosity ratios of EVA to PP were prepared by melt extrusion-micro-nano laminated co-extrusion. The effect of viscosity ratio on the dispersed phase morphology was studied. The effect of dispersed phase size on the crystallization behavior, melting temperature,tensile strength of composites was explored. Scanning electron microscope( SEM),differential scanning calorimeter( DSC) and microcomputer control electronic universal testing machine were adopted.The results show that the PP dispersed phase is more likely to form microfibillar with large aspect ratio,along with the viscosity ratio increases. As a result,the interface compatibility between disperse phase and matrix phase is improved. At the same time,the crystallization behavior of composites becomes favorable and the degree of crystallinity increases. The tensile strength of EVA/PP in situ microfibillar composite is improved.
引文
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[2]OLIVEIRA M C C D,VIANA M M,LINS V D F C.The causes and effects of degradation of encapsulant ethylene vinyl acetate copolymer(EVA)in crystalline silicon photovoltaic modules:A review[J].Renew Sust Energ Rev,2017,81:2299-2317.
[3]金世龙,郑斌茹,历娜,等.乙烯-乙酸乙烯酯共聚物接枝聚合物的合成、表征及应用新进展[J].化工进展,2017,36(10):3757-3764.
[4]KARGER-KOCSIS J,BARANY T.Single-polymer composites(SPCs):Status and future trends[J].Compos Sci Technol,2014,92(3):77-94.
[5]WEI L Q,DONG J H,QI Y H,et al.In situ polyolefin elastomer/poly(trimethylene terephthalate)microfibrillar composites fabricated via multistage stretching extrusion[J].Fibers Polym,2016,17(11):1916-1924.
[6]黄英,何亚东,姜李龙,等.微纤形态结构对PP/PA66原位微纤复合材料流变性能的影响[J].高分子学报,2017(5):867-874.
[7]叶东,谭方云.剪切速率在大型塑料注射模设计中的拓展应用[J].模具工业,2005(8):27-30.