作　　者： ; ; ; ; ;

机构地区： 郑州大学材料科学与工程学院

出　　处： 《上海塑料》 2013年第1期9-12,共4页

摘　　要： 采用微注射成型和常规注射成型制备厚度分别为200μm和2400μm的等规聚丙烯(iPP)制品。通过拉伸测试和广角X射线衍射(WAXD)对微注塑制品和常规注塑制品的力学性能及微观结构进行对比。拉伸测试结果表明:微注塑制品的拉伸强度(46.53MPa)较常规注塑制品的(38.43MPa)增加17.41%,而断裂伸长率和断裂韧性却明显降低。广角X射线衍射测试结果表明:微注塑制品形成了高度取向结构、且结晶度大于常规注塑制品的,高的取向度和结晶度导致了微注塑制品较高的拉伸强度和较低的断裂伸长率及断裂韧性。 lsotactic polypropylene （iPP） microparts with 200 ptm thickness and macroparts with 2 400 μm thickness were prepared using micro-iniection molding and conventional injection molding respectively. Tensile test and wide-angle X-ray diffraction （WAXD） were conducted to investigate the tensile proper- ties and morphology differences between microparts and macroparts. The tensile tests reveal that the tensile strength of microparts（46.53 MPa） is 17. 41% higher than that of macroparts（38. 43 MPa）, while the elongation at break and fracture toughness of micropart is notably lower than that of macropart. The crystallinity of the micropart is found higher than that of the macropart using WAXD analysis. High orientation structures are also observed in microparts. Thus higher orientation degree and crystai- linity of the micropart lead to the higher tensile strength and lower fracture toughness and elongation at break,

关 键 词： 微注射成型 常规注射成型 等规聚丙烯 拉伸性能 微观结构

领　　域： [化学工程]