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  

Effect of MDBS on Crystalline Structures Property of PP

作　　者：倪卓[1] 牛柯[1] 

机构地区：[1]深圳大学化学与化工学院,广东深圳518060

出　　处：《化学与粘合》2009年第3期1-3,14,共4页Chemistry and Adhesion

基　　金：2007年广东省科技计划项目资助(编号:2007B010600037)

摘　　要：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。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 α form of crystalline morphology, decrease in spherulite size and increase in crystalline density, resulting in an increase in the crystallinity and melting temperatures, etc. These eventually cause an improvement of optical properties.

关 键 词：1 3—2 4-二亚(对甲基)苄基山梨醇 聚丙烯 透明成核剂 结晶形态 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]