Bouriche Amina, Alachaher-Bedjaoui Lamia, Barrera Ana, Staelens Jean-Noël, Maschke Ulrich
Laboratoire de Recherche sur les Macromolécules (LRM), Faculté des Sciences, Université AbouBekr Belkaïd de Tlemcen (UABB), BP 119, Tlemcen 13000, Algeria.
Unité Matériaux et Transformations (UMET), UMR 8207, Université Lille, CNRS, INRAE, Centrale Lille, 59000 Lille, France.
Polymers (Basel). 2023 Sep 29;15(19):3934. doi: 10.3390/polym15193934.
The thermal degradation behavior of Poly(2-ethyl hexyl hcrylate) (Poly(2-EHA)), blended with a commercially available nematic liquid crystal (LC) mixture, was investigated by thermal gravimetric analysis (TGA). Different heating rates, ranging from 5 to 200 °C/min, were applied under an inert atmosphere. Based on the TGA results, activation energies () at different conversion rates () were determined using three integral isoconversion methods: Flynn-Wall-Ozawa (FWO), Tang, and Kissinger-Akahira-Sunose (KAS). It can be noticed that the global evolution of these activation energies was the same for the three models. The coefficient of determination presented values generally higher than 0.97. Using these models, the value for the LC remains constant at 64 kJ/mol for all conversions rates. For the polymer Poly(2-EHA), applying the Tang and FWO models, the activation energy presents a variation ranging from 80 kJ/mol, for conversion = 0.1, to 170 kJ/mol, for = 0.9. For the third model (KAS), this energy varies between 80 and 220 kJ/mol in the same range of .
通过热重分析（TGA）研究了聚（2-乙基己基丙烯酸酯）（聚（2-EHA））与市售向列型液晶（LC）混合物共混物的热降解行为。在惰性气氛下采用5至200℃/分钟的不同加热速率。基于TGA结果，使用三种积分等转化率方法：Flynn-Wall-Ozawa（FWO）、Tang和Kissinger-Akahira-Sunose（KAS）确定不同转化率（）下的活化能（）。可以注意到，这三种模型的这些活化能的整体演变是相同的。决定系数的值通常高于0.97。使用这些模型，对于所有转化率，LC的 值保持在64 kJ/mol不变。对于聚合物聚（2-EHA），应用Tang和FWO模型，活化能在转化率 = 0.1时为80 kJ/mol至 = 0.9时为170 kJ/mol之间变化。对于第三个模型（KAS），在相同的 范围内，该能量在80至220 kJ/mol之间变化。
