聚丙烯对聚丁烯-1晶型Ⅱ-Ⅰ转变的影响  

Influences of Polypropylene on Phase Ⅱ-Ⅰ Transformation of Polybutene-1

作　　者：闫相杰 马亚萍 赵远进 刘晨光[1] 贺爱华[1] YAN Xiang-jie;MA Ya-ping;ZHAO Yuan-jin;LIU Chen-guang;HE Ai-hua(Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization,Key Laboratory of Rubber-Plastics(Ministry of Education),School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]山东省烯烃催化与聚合重点实验室橡塑材料与工程教育部重点实验室青岛科技大学高分子科学与工程学院,青岛266042

出　　处：《高分子通报》2024年第3期368-376,共9页Polymer Bulletin

基　　金：山东省重大科技创新工程项目(项目号2019JZZY010352,2021CXGC010901);山东省自然科学基金(基金号ZR2020ME079);泰山学者工程资助。

摘　　要：等规聚丁烯-1 (PB)晶型Ⅱ-Ⅰ转变与晶型调控影响着其加工成型周期及性能,因此PB晶型Ⅱ-Ⅰ转变一直是研究的热点。PB/等规聚丙烯(PP)共混物作为典型的结晶/结晶聚合物共混体系,其组分含量、结晶温度对其聚集态结构产生重要影响,进而影响PB的晶型转变。本文研究了PB/PP共混体系中PP组分含量对PB晶型Ⅰ成核及晶型Ⅱ-Ⅰ转变的影响。采用广角X射线衍射仪(WAXD)、差示扫描量热仪(DSC)、小角X射线散射仪(SAXS)和偏光显微镜(POM)观察PB/PP共混物的结晶形貌及晶型Ⅱ的晶体结构,原位观察不同含量的PP对PB晶型Ⅱ-Ⅰ转变过程的影响。研究发现,低含量PP(≤20wt%)的加入,共混物中PB晶型Ⅰ成核及晶型Ⅱ-Ⅰ转变速率随PP含量增加而增加;而当PP含量≥25wt%,共混物中PB晶型Ⅰ成核及晶型Ⅱ-Ⅰ转变速率随PP含量增加而逐渐降低。当PP含量为20wt%时,PB/PP共混物中PB晶型Ⅰ成核最多,晶型Ⅱ-Ⅰ转变最快,晶型Ⅰ结晶度最高。进一步探讨了PB/PP共混物中PP的含量对PB晶型Ⅱ-Ⅰ转变影响的内在机制。Crystal-crystal Ⅱ-Ⅰ transformation and crystal form regulation of isotactic polybutene-1(PB)determined its molding period and properties.Study on crystal-crystal Ⅱ-Ⅰ transformation of PB has always been the research hot issue.As the typical crystalline/crystalline polymer blends,the aggregation structures and thus the crystal-crystal transformation of PB in the PB/polypropylene(PP)blends are influenced greatly by PP content and crystallization temperature.In this work,the effects of PP content on the nucleation and transformation rate of PB form Ⅰ were studied.The crystallization morphology of PB/PP blends and crystal structure of PB form Ⅱ were studied by wide-angle X-ray diffraction(WAXD),differential scanning calorimetry(DSC),small-angle X-ray scattering(SAXS)and polarizing microscopy(POM).The influence of PP content on the PB form Ⅱ-Ⅰ transition was in situ observed.It was found that the nucleation of PB form Ⅰ and form Ⅱ-Ⅰ transition rate increased with the increase in PP content when≤20 wt%PP was blended.While the nucleation of PB form Ⅰ and form Ⅱ-Ⅰ transition rate decreased gradually with the increase in PP content when more than 25 wt%PP was blended.The nucleation of PB form Ⅰ,PB form Ⅱ-Ⅰ transition rate and transition degree in PB/PP(80/20)blend reached the highest.The influencing mechanism of PP component on PB form Ⅱ-Ⅰ transition was discussed.

关 键 词：聚丁烯-1 聚丙烯 共混 片晶厚度 晶型转变 

分 类 号：TQ325.15[化学工程—合成树脂塑料工业]