工艺条件对聚丙烯/乙烯-醋酸乙烯酯共聚物原位微纤复合材料的微纤形态及流变性能影响
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摘要
通过微纳层叠共挤技术实现聚丙烯(iPP)在乙烯-醋酸乙烯酯共聚物(EVA)中的原位成纤,研究不同牵引速率、螺杆转速对iPP/EVA(15/85)原位微纤复合材料(MFCs)中微纤形态及流变性能影响。扫描电子显微镜结果显示,在不同的牵引速率下,iPP均在EVA中形成微纤,随着牵引速率的增大,iPP微纤的直径先下降后增大。在不同螺杆转速下,iPP均形成长径比较大的微纤,随着螺杆转速的增加,形成的iPP微纤平均直径先增大后减小,微纤直径分布范围逐渐变窄。流变分析测试表明,当牵引速率为50 r/min时,MFCs的G′、G″和η~*均最大;当螺杆转速为250 r/min时,MFCs的G′、G″和η~*均最低。
The in-situ isotactic polypropylene(iPP)microfiber was prepared by micro-nano-stack co-extrusion technique in vinyl-vinyl acetate copolymer(EVA),and the effect of different stretching rates and screw speeds on the morphology and rheological properties of microfibers in the iPP/EVA(15/85)in-situ microfiber composites(MFCs)was studied.The scanning electron micrographs show that iPP forms microfibers in the EVA matrix under different tensile speeds,the diameter of iPP microfibers decreases first and then increases with the stretching rate increasing.iPP forms microfibers with relatively large lengths at the four different screw speeds,the average diameter of the iPP microfibers increases first and then decreases with the increase of screw speed,and the distribution range of microfiber diameters gradually narrowed.The G′,G′ and η* of the MFCs are the largest when the stretching rate is 50 r/min,and the G′,G′ and η* of the MFCs are the lowest when the screw speed is 250 r/min.
The in-situ isotactic polypropylene(iPP)microfiber was prepared by micro-nano-stack co-extrusion technique in vinyl-vinyl acetate copolymer(EVA),and the effect of different stretching rates and screw speeds on the morphology and rheological properties of microfibers in the iPP/EVA(15/85)in-situ microfiber composites(MFCs)was studied.The scanning electron micrographs show that iPP forms microfibers in the EVA matrix under different tensile speeds,the diameter of iPP microfibers decreases first and then increases with the stretching rate increasing.iPP forms microfibers with relatively large lengths at the four different screw speeds,the average diameter of the iPP microfibers increases first and then decreases with the increase of screw speed,and the distribution range of microfiber diameters gradually narrowed.The G′,G′ and η* of the MFCs are the largest when the stretching rate is 50 r/min,and the G′,G′ and η* of the MFCs are the lowest when the screw speed is 250 r/min.
引文
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[3]Wang B B,Tang Q B,Hong N N,et al.Effect of cellulose acetate butyrate microencapsulated ammonium polyphosphate on the flame retardancy,mechanical,electrical,and thermal properties of intumescent flame-retardant ethylene vinyl acetate copolymer/microencapsulated ammonium polyphosphate/polyamide-6blends[J].ACS Appl.Mater.Interfaces,2011,3:3754-3761.
[4]Alexandre M,Beyer G,Henrist C,et al.Preparation and properties of layered silicate nanocomposites based on ethylene vinyl acetate copolymers[J].Macromol.Rapid Commun.,2001,22:643-646.
[5]John B,Varughese K T,Oommen Z,et al.Dynamic mechanical behavior of high-density polyethylene/ethylene vinyl acetate copolymer blends:the effects of the blend ratio,reactive compatibilization,and dynamic vulcanization[J].J.Appl.Polym.Sci.,2003,87:2083-2099.
[6]Yuwawech K,Wootthikanokkhan J,Tanpichai S.Enhancement of thermal,mechanical and barrier properties of EVA solar cell encapsulating films by reinforcing with esterified cellulose nanofibres[J].Polym.Test.,2015,48:12-22.
[7]Fuchs C,Bhattacharyya D,Friedrich K,et al.Application of Halpin-Tsai equation to microfibril reinforced polypropylene/poly(ethylene terephthalate)composites[J].Compos.Interfaces,2006,13:331-344.
[8]Huang W Y,Shen J W,Chen X M,et al.Factors influencing the fiberization and mechanical properties of polypropylene/polyamide66in situ composites[J].Polym.Int.,2003,52:1131-1135.
[9]Taepaiboon P,Junkasem J,Dangtungee R,et al.In situ microfibrillar-reinforced composites of isotactic polypropylene/recycled poly(ethylene terephthalate)system and effect of compatibilizer[J].J.Appl.Polym.Sci.,2006,102:1173-1181.
[10]孙小杰,喻琴,高胜玲,等.多级牵引PP/PA1010/CB导电复合材料的结构与性能[J].高分子材料科学与工程,2011,27(7):125-128.Sun X J,Yu Q,Gao S L,et al.Structure and properties of polypropylene/polyamide1010/carbon black composites prepared through multistage stretching extrusion[J].Polymer Materials Science&Engineering,2011,27(7):125-128.
[11]Ponting M,Hiltner A,Baer E.Polymer nanostructures by forced assembly:process,structure,and properties[C]//Macromolecular symposia.Weinheim:WILEY-VCH Verlag,2010,294:19-32.
[12]Langhe D S,Hiltner A,Baer E.Melt crystallization of syndiotactic polypropylene in nanolayer confinement impacting structure[J].Polymer,2011,52:5879-5889.
[13]Gupta M,Lin Y,Deans T,et al.Structure and gas barrier properties of poly(propylene-graft-maleic anhydride)/phosphate glass composites prepared by microlayer coextrusion[J].Macromolecules,2010,43:4230-4239.
[14]Shen J,Wang M,Li J,et al.In situ fibrillation of polyamide 6in isotactic polypropylene occurring in the laminating-multiplying die[J].Polym.Adv.Technol.,2011,22:237-245.
[15]Wang J,Zhang X,Zhao T,et al.Morphologies and properties of polycarbonate/polyethylene in situ microfibrillar composites prepared through multistage stretching extrusion[J].J.Appl.Polym.Sci.,2014,131:DOI:10.1002/app.40108.
[16]Dong J H,Qi Y H,Sun J,et al.In situ fibrillation of poly(trimethylene terephthalate)in polyolefin elastomer through multistage stretching extrusion[J].J.Appl.Polym.Sci.,2016,133:DOI:10.1002/app.43797.
[17]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.,2016,17:1916-1924.
[18]Dong J,Huang A,Sun J,et al.Effect of draw ratio on the morphologies and properties of in situ microfibrillar POE/PTTcomposites[J].Polym.Compos.,2019,40:E629-E637.