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文章编号: 1672-6987(2025)05-0099-07 DOI: 10.16351/j.1672-6987.2025.05.013
闫相杰, 赵远进, 刘晨光, 贺爱华*(青岛科技大学 高分子科学与工程学院; 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, 山东 青岛 266042)
摘要: 研究高等规聚丁烯(PB-1)晶型Ⅱ—Ⅰ转变、探寻晶型转变调控手段,对于缩短PB-1加工成型周期、理解聚烯烃固-固转变机理具有重要意义。将PB-1熔体快速降温至晶型Ⅱ的不同结晶温度(100, 60 ℃),研究了PB-1晶型Ⅱ等温结晶温度对其室温晶型转变的影响。采用偏光显微镜(POM)、小角X射线散射(SAXS)和差示扫描量热仪(DSC)研究PB-1晶体结构,采用原位广角X射线衍射(WAXD)对等温结晶的PB-1(From Ⅱ)的室温Ⅱ—Ⅰ转变进行原位跟踪。研究发现,与60 ℃等温结晶形成的晶型Ⅱ球晶尺寸小、数量多相比,100 ℃等温结晶的PB-1晶型Ⅱ球晶尺寸大、数量少,结晶更完善,片晶厚,利于晶型Ⅰ的成核,且晶型Ⅱ—Ⅰ转变速度显著加快。探讨了片晶厚度与过冷度对PB-1的晶型Ⅱ—Ⅰ转变的影响。
关键词: 高等规聚丁烯; 结晶温度; 晶型转变; 片晶厚度
中图分类号: O 631 文献标志码: A
引用格式: 闫相杰, 赵远进, 刘晨光, 等. 等温结晶温度对聚丁烯晶型转变的影响[J]. 青岛科技大学学报(自然科学版), 2025, 46(5): 99-105.
YAN Xiangjie, ZHAO Yuanjin, LIU Chenguang, et al. Effect of isothermal crystallization temperature on crystal-crystal transformation of polybutene[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2025, 46(5): 99-105.
Effect of Isothermal Crystallization Temperature on Crystal-Crystal Transformation of Polybutene
YAN Xiangjie, ZHAO Yuanjin, LIU Chenguang, HE Aihua(College of Polymer Science and Engineering; Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization; Key Laboratory of Rubber-Plastics, Ministry of Education, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: It is of great significance to study the form Ⅱ—Ⅰ transition of high isotactic polybutene (PB-1) and explore the regulation means of form Ⅱ—Ⅰ transition for shortening PB-1 processing cycle and understanding the mechanism of polyolefin solid-solid transition. In this paper, the effect of isothermal crystallization temperature on the crystal crystal Ⅰ transition of PB-1 at room temperature was studied by quenching the PB-1 melt to different crystallization temperatures (100, 60 ℃). The crystal structures of PB-1 were studied by polarizing microscope (POM), small Angle X-ray scattering (SAXS) and differential scanning calorimeter (DSC). The room temperature Ⅱ—Ⅰ transition of PB-1 was tracked by in situ wide-angle X-ray diffraction (WAXD). Compared with PB-1 crystallized at 60 ℃, the PB-1 crystallized at 100 ℃ showed much less and much larger spherulites with larger lamellar thickness and more perfect crystals of form Ⅱ, which were benefited to the nucleation of form Ⅰ and significantly accelerated formⅡ—Ⅰ transformation rate. The influences of the lamellar thickness and the degree of undercooling on the form Ⅱ—Ⅰ transformation were further discussed.
Key words: high isotacticity PB-1; crystallization temperature; crystalline transition; lamellar thickness
收稿日期: 2024-11-14
基金项目: 山东省重大科技创新工程项目(2019JZZY010352, 2021CXGC010901); 山东省自然科学基金项目(ZR2020ME079); 泰山学者工程项目(2022).
作者简介: 闫相杰(1996—), 男, 硕士研究生. * 通信联系人.