填充PP复合材料中的β-晶韧性与填料增强相互作用的研究

Investigation on α→β transition of nucleation mechanism of filler, interaction between α-nucleation and β-nucleation, as well as control technology of β-crystal content in the filled PP composites, reinforcing effect of filler in β-PP and toughening effect of β-crystal in the filled β-PP composites has little reported. In order to combine the toughness of β-PP and reinforcing effect of filler to develop the high performance PP composites, this program mainly investigate: (1) α→β transition of nucleation mechanism of filler with different morphology (nano- and micro-noddule, layer and rodlike) and control technolopy of β-nucleating ability of filler surface. And a series of β-fillers with different β-nucleating ability are obtained. (2) inter-influence between α-nucleation and β-nucleation in the PP composites containing same and different filler with α- or β-nucleation and control technolopy of β-nucleating ability of filled PP composites. And a series of filled PP composites with different β-crystal content are obtained. (3) relationship between mechanical property, fracture mechanism and β-crystal content, crystallization morphology, filler morphology and dispersion et al, and synergistic effects of toughening of β-crystal and reinforcing of filler. Through above investigation, high performance β-PP composites with high β-crystal content, high toughness and high rigidity are prepared.

针对填料表面成核机理α→β转变、填充PP复合材料中α-成核作用与β-成核作用的相互影响和β-晶含量可控技术、填料增强与β-晶韧性协同作用研究很少报道，为结合β-PP的高韧性和无机粒子的增强作用，开发高性能填充β-PP复合材料，重点研究：（1）不同形态（纳米和微米级球状、层状、棒状等）填料表面成核机理α→β转变和表面具有β-成核能力可控的不同形态填料的制备技术，提供一系列不同形态β-填料。（2）同种和异种填料填充PP复合材料中的α-成核作用和β-成核作用相互影响和填充PP复合材料中β-成核能力可控的技术，提供一系列β-晶含量可控的填充PP复合材料。（3）填充PP复合材料的力学性能、断裂机理与β-晶含量、β-球晶结构形态、填料形态及其分散性、界面相互作用关系，填料增强与β-晶增韧协同作用和高韧性填充PP复合材料制备的技术。通过以上研究，制备出高强度、高刚性、高韧性的高性能填充β-PP复合材料

针对填料表面成核机理α→β转变、填充PP复合材料中α-成核作用与β-成核作用的相互影响和β-晶含量可控技术、填料增强与β-晶韧性协同作用研究很少报道，本项目采用负载技术研究了表面具有β-成核作用的碳酸钙、硅灰石、纳米碳管、蒙脱土和氢氧化铝等无机粒子的制备方法，填料表面成核机理α→β转变，获得了一系列具有β-成核作用的无机粒子，采用该无机粒子制备了一系列高β-晶含量填充PP复合材料。通过控制负载β-成核剂的量或者具有β-成核作用填料用量，研究了填充PP复合材料中α-成核作用与β-成核作用的相互影响，制备了一系列不同β-晶含量的填充PP复合材料。对比研究不同无机粒子填充PP复合材料的力学性能等，发现无机粒子的增强作用提高填充β-PP复合材料的刚性，而β-晶赋予填充PP复合材料高的冲击强度，填料增强与β-晶增韧协同作用获得了高强度、高刚性、高韧性的高性能填充β-PP复合材料。