Two-Dimensional Correlation Analysis of iPP Bead Foaming Thermal Features Modeled by Fast Scanning Calorimetry,ACS Macro Letters

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Two-Dimensional Correlation Analysis of iPP Bead Foaming Thermal Features Modeled by Fast Scanning Calorimetry
ACS Macro Letters ( IF 5.1 ) Pub Date : 2021-10-04 , DOI: 10.1021/acsmacrolett.1c00435
Jean-Mathieu Pin ₁ , Andrew Anstey ₁ , Markus Schubnell ₂ , Patrick C Lee ₁

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The bead foaming of semicrystalline polymers is a complex thermal process involving the formation of multiple crystalline populations, which serve the dual purposes of ensuring the structural integrity of beads while also allowing bead sintering at the interface. The quality of this “double melting peak” structure is determined by the temperature and duration of the isothermal treatment of the beads as well as the quenching rate following the isotherm. Currently, the intricacies of the quenching process are not very well-known due to the challenge of replicating these rapid cooling rates in a laboratory setting. Fast-scanning calorimetry was used to reproduce these conditions for isotactic polypropylene (iPP), revealing optimal quenching rates for the bead foaming of iPP. We further probed these thermal features using two-dimensional correlation analysis as a tool to understand the dynamics, interdependence, and relative contributions of multiple thermal events such as glass transition, mesophase formation, cold crystallization, and melting in response to the perturbation of the quenching rate.

中文翻译：

快速扫描量热法模拟iPP微珠发泡热特性的二维相关性分析

半结晶聚合物的珠粒发泡是一个复杂的热过程，涉及形成多个结晶群，其具有双重目的，即确保珠粒的结构完整性，同时还允许珠粒在界面处烧结。这种“双熔峰”结构的质量取决于珠子等温处理的温度和持续时间，以及等温线后的淬火速率。目前，由于在实验室环境中复制这些快速冷却速度的挑战，淬火过程的复杂性并不是很为人所知。快速扫描量热法用于重现等规聚丙烯 (iPP) 的这些条件，揭示了 iPP 珠粒发泡的最佳淬火速率。

更新日期：2021-10-19

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