成核剂1，3—2，4-二亚（对甲基）苄基山梨醇对聚丙烯结晶性能的影响

1,3—2，4-二亚（对甲基）苄基山梨醇（MDBS）可以改变PP结晶结构，细化晶粒结构尺寸，提高结晶度，加快结晶速度和其它性能。以MDBS为成核剂，使用溶液沉淀法制备MDBS质量分数分别为0．1％、0．3％、0．5％、0．7％、0．9％的粉末聚丙烯样品，采用红外光谱仪、差示扫描量热仪，X-射线衍射仪和偏光显微镜等技术进行结晶性能的研究。结果表明，透明成核剂MDBS是PP的有效α诱导剂，MDBS的加入能诱导大量球晶生成，使结晶峰尖锐，结晶温度区间变窄，提高PP的结晶速率和结晶度，差示扫描量热法测得结晶度提高19％左右。FT-IR，X-ray衍射和DSC等分析结果一致，即在PP中添加0．3％MDBS时，聚丙烯的改性效果最好，PP的结晶度达到最大值。

Effect of MDBS on Crystalline Structures Property of PP

1,3-2,4-Di(p-methyl)benzylidene sorbitol(MDBS) had been synthesized in the lab from p-methyl benzaldehyde and D-sorbitol,a series of PP samples were prepared based on the amount of nucleating agent used,which were 0.1%,0.3%,0.5%,0.7% and 0.9% respectively.Various techniques including FT-IR,DSC,WAXD,polarized light microscopy,etc.were employed to investigate crystalline structures and thermal properties of the samples.Extensive experiments demonstrate that MDBS can nucleate PP effectively and efficiently in ...