聚丙烯/聚丙烯接枝丙烯酸/蒙脱土纳米复合材料的制备及性能

Preparation and Properties of Polypropylene/Montmorillonite Nanocomposites Using Graft Copolymer of Polypropylene and Acrylic Acid as Compatilizer

用悬浮接枝法制备了接枝率为2 2%的聚丙烯接枝丙烯酸作为相容剂,用十六烷基三甲基溴化铵对钠基蒙脱土进行了有机化处理,使蒙脱土的层间距从1 2nm增加到了3 84nm。通过熔融插层法制备了插层型聚丙烯/蒙脱土纳米复合材料(Polypropylene/MontmorilloniteNanocomposites,PNC),复合材料中蒙脱土层间距比有机蒙脱土的层间距又有小幅度的增加。当蒙脱土含量为2%,相容剂用量为15%时的复合材料力学性能最好,缺口冲击强度和拉伸强度分别达到12 12kJ/m2和35 77MPa,分别比纯1PP增加了180%和4 3%,蒙脱土的加入起到了增韧和增强的双重作用。

Acrylic acid (AA) was successfully grafted onto polypropylene by suspension process.The maximum AA grafting rata was 2.2%.The obtained graft copolymer was used as compatilizer for polypropylene/montmorillonite nanocomposites.Na montmorillonite (MMT) was modified by hexadecyltrimethyl ammonium bromide (HTAB) and the d_(001) layer spacing increased from 1.2nm to 3.84nm.Nanocomposites was prepared by melt intercalation and the d_(001) of montmorillonite in nanocomposites increased a little compared with that of O-MMT.When the montmorillonite content was 2% and compatilizer content was 15%,the obtained nanocomposites showed the best mechanical properties with izod impact strength 12.12kJ/m^2 and tensile strength 35.77MPa.The izod impact strength and tensile strength increased by 180% and 4.3% compared with those of matrix, respectively.The above results confirmed that the addition of MMT could improve the impact and tensile strength of polypropylene synchronously.