Effects of nano calcium carbonate modified by a lanthanum compound on the properties of polypropylene
Effects of nano calcium carbonate modified by a lanthanum compound on the properties of polypropylene
复制标题
DOI：
10.1002/app.21804
复制
发表时间：
2005-08-05
影响因子：
3
通讯作者：
Cai, TM
中科院分区：
文献类型：
--
作者：
Guo, T;Wang, LS;Cai, TM
采用化学沉积包覆法对纳米碳酸钙(nCaCO(3))粒子进行表面修饰，制备了包覆La的纳米碳酸钙(nCaCO(3)-La)粒子。在双辊磨机上制备了PP/nCaCO(3)和PP/nCaCO(3)-La复合材料。力学性能测试表明，随着填料的加入，复合材料的冲击强度呈先增大后减小的趋势，拉伸强度也随之降低。PP/nCaCO(3)-La的冲击强度高于PP/nCaCO(3)，PP/nCaCO(3)-5LA的冲击强度是纯PP的3倍。透射电子显微镜和扫描电子显微镜表明，nCaCO(3)-La在PP中分散良好，颗粒大小分布均匀，与PP的结合非常紧密。采用差示扫描量热法和广角X射线衍射法研究了纯PP及其复合材料的结晶性能。结果表明，La化合物的加入易形成M-PP相。与纯PP相比，nCaCO(3)-La的加入导致了较高的结晶温度。随着nCaCO(3)-La的加入，微晶尺寸增大，PP结晶的成核性得到改善。(C)2005年威利期刊公司。
The surface modification of nano calcium carbonate (nCaCO(3)) particles was carried out with a soluble compound of lanthanum via a coating process of chemical deposition, and nCaCO(3) particles covered with a compound of lanthanum (nCaCO(3)-La) were prepared. The polypropylene (PP)/nCaCO(3) and PP/nCaCO(3)-La composites were prepared with a two-roll mill. The measurements of the mechanical properties showed that the impact strength of the composites increased at first and then decreased with the addition of fillers, and the tensile strength was reduced at the same time. The impact strength of PP/nCaCO(3)-La was higher than that of PP/nCaCO(3), and the impact strength of PP/nCaCO(3)-5La was three times that of virgin PP. Transmission electron microscopy and scanning electron microscopy showed that nCaCO(3)-La dispersed well in the PP matrix, the size distribution of the particles was uniform, and nCaCO(3)-La adhered to the PP matrix very closely. The crystallization properties of virgin PP and its composites were studied with differential scanning calorimetry and wide-angle X-ray diffraction. The results showed that the M-PP phase easily formed with the addition of the lanthanum compound. In comparison with virgin PP, the addition of nCaCO(3)-La led to a higher crystallization temperature. The size of the crystallites increased with the addition of nCaCO(3)-La, and the nucleation of PP crystalline was also improved. (c) 2005 Wiley Periodicals, Inc.