聚丙烯共混物脆韧转变的新方法探究
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摘要
采用熔融共混方法制备了聚丙烯(PP)/聚烯烃弹性体(POE)/填料共混物。通过填料选择、工艺调节和POE复配三种方法,实现了POE含量固定的前提下,PP共混物的脆韧转变。研究表明,采用纳米填料替代微米填料,选择适当的工艺参数(低螺杆转速等),复配高熔体质量流动速率(MFR) POE,均能实现PP/POE/填料共混物的脆韧转变。纳米填料也可显著提升材料的弯曲模量。值得一提的是,在配方固定的基础上,调节工艺实现材料脆韧转变的同时,对材料弯曲性能无影响。
The polypropylene( PP)/polyolefin elastomer( POE) blends were prepared by melt extrusion. Under the premise of fixed elastomer loading,the brittle-ductile transition of PP blends could be achieved by three methods,the optimization of filler type,the adjustment of extrusion parameters and the compounding of elastomers. This research shows that utilizing the nano-filler to replace the micro-filler,appropriate extrusion parameters( low extrusion rotation speed,etc.) and compounding with high melt mass flow rate( MFR) POE are the optimized way to achieve the brittle-ductile transition of PP blends. The nanofiller could also improve the flexural modulus. Specially,this research demonstrates that the brittle-ductile transition phenomenon has no influence on the flexural properties under the same compounding formula.
The polypropylene( PP)/polyolefin elastomer( POE) blends were prepared by melt extrusion. Under the premise of fixed elastomer loading,the brittle-ductile transition of PP blends could be achieved by three methods,the optimization of filler type,the adjustment of extrusion parameters and the compounding of elastomers. This research shows that utilizing the nano-filler to replace the micro-filler,appropriate extrusion parameters( low extrusion rotation speed,etc.) and compounding with high melt mass flow rate( MFR) POE are the optimized way to achieve the brittle-ductile transition of PP blends. The nanofiller could also improve the flexural modulus. Specially,this research demonstrates that the brittle-ductile transition phenomenon has no influence on the flexural properties under the same compounding formula.
引文
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[11]WU Y,ZHANG H,SHENTU B,et al.Preparation of poly(phenylene oxide)/polyamide-6 nanocomposites with high tensile strength and excellent impact performance[J].Ind Eng Chem Res,2015,54(22):5870-5875.
[2]黄险波,李永华,罗忠富,等.相容剂对PP/POE共混体系脆韧转变行为的影响[J].高分子学报,2012,12:1441-1447.
[3]吴国峰,雷亮,杨波,等.车用聚丙烯材料线性膨胀系数的影响因素分析[J].工程塑料应用,2017,45(3):134-137.
[4]WU S.Phase structure and adhesion in polymer blends:Acriterion for rubber toughening[J].Polymer,1985,26(12):1855-1863.
[5]FU S Y,FENG X Q,LAUKE B,et al.Effects of particle size,particle/matrix interface adhesion and particle loading on mechanical properties of particulate-polymer composites[J].Composites Part B,2008,39:933-961.
[6]BORGGREVE R J M,GAYMANS R J,SCHUIJER J,et al.Brittle-tough transition in nylon-rubber blends:Effect of rubber concentration and particle size[J].Polymer,1987,28(9):1489-1496.
[7]JIANG W,LIU C H,WANG Z G,et al.Brittle-tough transition in PP/EPDM blends:Effects of interparticle distance and temperature[J].Polymer,1998,39(14):3285-3288.
[8]BILOTTI E,DENG H,ZHANG R,et al.Synergistic reinforcement of highly oriented poly(propylene)tapes by sepiolitenanoclay[J].Macromol Mater Eng,2010,295(1):37-47.
[9]LI H,HU G H.The early stage of the morphology development of immiscible polymer blends during melt blending:Compatibilized vs.uncompatibilized blends[J].J Polym Sci Polym Phys,2001,39(5):601-610.
[10]KHATUA B B,LEE D J,KIM H Y,KIM J K.Effect of organoclay platelets on morphology of nylon-6 and poly(ethylene-ran-propylene)rubber blends[J].Macromolecules,2004,37(7):2454-2459.
[11]WU Y,ZHANG H,SHENTU B,et al.Preparation of poly(phenylene oxide)/polyamide-6 nanocomposites with high tensile strength and excellent impact performance[J].Ind Eng Chem Res,2015,54(22):5870-5875.