两种羧酸盐成核剂的制备及其对聚丙烯的成核效果研究  

Preparation of two carboxylate nucleating agents and their nucleation effect on polypropylene

作　　者：张泽文 朱恩赐 张熙祥 魏丽娟 赵世成[1] ZHANG Zewen;ZHU Enci;ZHANG Xixiang;WEI Lijuan;ZHAO Shicheng(Shanghai Key Laboratory of Multiphase Materials Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;North Huajin Chemical Industries Group Corporation,Panjin 124021,China)

机构地区：[1]华东理工大学化工学院,上海多相结构材料化学工程重点实验室,上海200237 [2]北方华锦化学工业股份有限公司,辽宁盘锦124021

出　　处：《中国塑料》2022年第12期100-107,共8页China Plastics

摘　　要：合成了两种具有相似化学结构的聚丙烯(iPP)α晶型成核剂二环[2.2.1]庚-5-烯-2,3-二羧酸钠(NA1)和二环[2.2.1]庚烷-2,3-二羧酸钠(NA2),研究了其在iPP中的成核效果。首先,利用差示扫描量热仪(DSC)和偏光显微镜(PLM)分别考察了两种成核剂对iPP结晶行为的影响。结果表明,当NA1和NA2的含量为0.3%(质量分数,下同)时,iPP的结晶峰值温度分别提升了14.5℃和16.0℃。同时,两种成核剂都能够明显细化iPP球晶尺寸。其次,利用广角X射线衍射仪(WXAD)对成核iPP进行了表征,两种成核剂都诱导iPP产生了α晶型,说明均为α晶型成核剂。然后,对成核iPP的力学性能进行了表征。结果表明,随着两种成核剂用量的增加,iPP的拉伸强度和弯曲模量呈现先升高后平稳的趋势。当NA1和NA2含量为0.05%时,成核iPP的拉伸强度较纯iPP分别提升了4.6%和8.6%,弯曲模量分别提升了8.2%和21.7%;冲击强度基本保持不变。Two types ofα⁃form nucleating agents with a similar chemical structure,sodium bicyclo[2.2.1]hept⁃5⁃ene⁃2,3⁃dicarboxylate(NA1)and sodium bicyclo[2.2.1]heptane⁃2,3⁃dicarboxylate(NA2),were synthesized,and their nucle⁃ation effects on the crystallization behavior of isotactic polypropylene(iPP)was studied.The crystallization temperature and crystal morphology of iPP nucleated with the two nucleating agents were investigated using differential scanning calo⁃rimetry and polarized optical microscope(PLM).The results indicated that the crystallization peak temperature of iPP in⁃creased by 14.5℃and 16.0℃at 0.3 wt%NA1 and NA2,respectively.Meanwhile,the two nucleating agents could re⁃fine the spherical crystal size of iPP significantly.The nucleated iPP was characterized using wide⁃angle X⁃ray diffraction.Both of two nucleating agents were found to induce the formation ofα⁃form crystalline polypropylene,indicating goodα⁃form nucleation effectiveness.The mechanical properties of the nucleated polypropylene were characterized.The nucleat⁃ed polypropylene exhibited an increase in tensile strength and flexural modulus at first and then tended to be stable with in⁃creasing the contents of two nucleating agents.Compared to pure iPP,the tensile strength of the nucleated iPP increased by 4.6%and 8.6%at 0.05 wt%NA1 and NA2,respectively.The iPP nucleated with 0.05 wt%NA1 and NA2 also showed an increase in flexural modulus by 8.2%and 21.7%,respectively,and its impact strength keep stable basically.

关 键 词：等规聚丙烯 α晶成核剂 结晶行为 力学性能 等温结晶动力学 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]