一种新型聚丙烯成核剂的合成及表征

Preparation of a Novel Nucleating Agent and Its Representation

以邻苯二甲酸和异丙醇铝为原料,合成了新型的邻苯二甲酸羟基铝盐类聚丙烯成核剂(OXA)。利用热重分析、X射线衍射仪、差示扫描量热仪和偏光显微镜分别考察了成核剂的热稳定性及其对等规聚丙烯(iPP)的晶型、结晶行为和结晶形态的影响,同时,还考查了成核剂对iPP力学性能的影响。结果表明,OXA是一种有效的聚丙烯α-晶型成核剂,当添加量为0.3%(质量分数,下同)时,iPP的结晶温度可提高13.26℃,结晶度由纯iPP的52.49%提高到58.37%,同时可显著细化iPP球晶;也明显提高了iPP的拉伸和弯曲强度,拉伸强度由36.18 MPa提高为43.41 MPa,弯曲强度由46.19 MPa提高至50.89 MPa。

With o-phthalic acid and aluminium isopropoxide as raw materials,a new salt of phthalic acid hydroxy aluminium was prepared,which was used as a nucleating agent for isotactic polypropylenes(iPP) and was denoted as OXA.Thermal stability of OXA was characterized by using thermogravimetric analysis technology(TG).The influence of OXA on the crystal form,crystalline morphology,and crystallization behavior of iPP were investigated using X-ray diffraction,polarized light microscopy,and differential scanning calorimetry.When the content of OXA was 0.3 wt%,the crystallization temperature(T_c) was 13.26 ℃.In addition,OXA increased the degree of crystallinity from 52.49%to 58.37%and refined spherulites were observed.The flexural strength was increased from 46.19 to 50.89 MPa.