可控增压条件下等规聚丙烯/β-成核剂的结晶行为研究  

Crystallization Behavior of Isotactic Polypropylene/β-Nucleating Agent under Controlled Pressurization Conditions

作　　者：魏聪 施智勇 张华珅 徐剑 王亚明[1] 刘春太[1] 申长雨[1] 邵春光[1] Cong Wei;Zhi-yong Shi;Hua-shen Zhang;Jian Xu;Ya-ming Wang;Chun-tai Liu;Chang-yu Shen;Chun-guang Shao(National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002)

机构地区：[1]郑州大学橡塑模具国家工程研究中心,郑州450002

出　　处：《高分子学报》2024年第12期1742-1753,共12页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号52273027)资助项目.

摘　　要：利用广角X射线和偏光显微镜研究了等规聚丙烯/β-成核剂(iPP/TMB-5)在不同增压条件下的结晶行为.结果表明:改变增压条件不仅能够控制TMB-5的自组装结构,改变iPP的结晶形貌,还能够制备出由不同晶相组成的iPP/TMB-5制品.不同增压温度下,TMB-5能够自组装成针状、花状或点状结构,进而诱导iPP生成棒状、花状或点状晶;较低的增压压力下,TMB-5能够组装成尺寸较大、结构较完善的聚集体,压力越高越不利于TMB-5的自组装;增压压力较低时(100、200 MPa),升高增压速率能够抑制TMB-5的自组装,当增压压力为500 MPa及以上时,这种抑制作用不明显;在iPP/TMB-5高压结晶过程中存在β-iPP、γ-iPP的竞争生长现象,增压压力越低越有利于β-iPP的形成,反之有利于γ-iPP的生成,压力为500 MPa或更高时,β-iPP完全消失,制备出纯的γ-iPP/TMB-5样品.β-Nucleating agents can not only provide a large number of nucleation sites forβ-iPP crystallization and accelerate its crystallization,but also regulate the crystal morphology of iPP,which in turn affects its macroscopic properties.In this study,the crystallization behavior of isotactic polypropylene/β-nucleating agent(iPP/TMB-5)under different pressurization conditions was investigated using wide-angle X-ray diffraction and polarized optical microscopy.The results show that changing the pressurization conditions can not only control the self-assembly structure of TMB-5 and change the crystalline morphology of iPP,but also prepare iPP/TMB-5 products with different crystalline phases.At different pressurization temperatures,TMB-5 can self-assemble into needle-like,flower-like or dot-like structures,which in turn induces iPP to produce rod-like,flower-like or dot-like crystals;at lower pressurization pressures,TMB-5 can be assembled into larger-sized and better-structured aggregates,and the higher the pressure,the more detrimental to the self-assembly of TMB-5;at lower pressurization pressures(100,200 MPa),the higher pressurization rates can inhibit the self-assembly of TMB-5,and at lower pressurization pressures(100,200 MPa),the higher pressurization rates can inhibit the self-assembly of TMB-5.When the pressurization pressure is 500 MPa and above,this inhibitory effect is not obvious;in the process of iPP/TMB-5 high-pressure crystallization,there is a competitive growth phenomenon ofβ-iPP andγ-iPP,and the lower the pressurization pressure,the more favorable the formation ofβ-iPP,and vice versa for the generation ofγ-iPP,and the higher the pressure is 500 MPa,theβ-iPP completely disappears,and theβ-iPP is prepared.iPP completely disappeared at a pressure of 500 MPa or higher,and pureγ-iPP/TMB-5 samples were prepared.

关 键 词：等规聚丙烯/β-成核剂 高压结晶 结晶形貌 β-成核剂自组装 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]