Activation energy determination in multi-frequency dynamic molecular interaction analysis of PEG 4000-Cristobalite composites using DMA

2nd International Symposium on Frontier of Applied Physics

Fauziyah, N.A.^1 ; Fadly, T.A.^1 ; Rosyidi, A.^1 ; Mashuri^1 ; Pratapa, S.^1

Departement of Physics, Faculty of Mathematics and Sciences, Institute of Technology Sepuluh Nopember, Surabaya

60111, Indonesia^1

关键词: Cristobalites;    Degradation activation energy;    Dynamic mechanical analysis (DMA);    Energetic barriers;    Energy determination;    Multi frequency;    Shear modes;    Structural unit;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/817/1/012020/pdf
DOI  :  10.1088/1742-6596/817/1/012020

来源: IOP

【 摘 要 】

Degradation activation energy of PEG-Cristobalite composites was investigated using Dynamic Mechanical Analysis (DMA) instrument at multi-frequency shear mode. The applied frequencies were 1, 10, 100, and 200 Hz. The cristobalite of as much as 20% and 40% by weight was used as the filler of the composites, while PEG 4000 was the matrix. Results showed that additional of cristobalite improved the storage modulus (G') of the composites almost five times of the pure PEG 4000. Moreover, such addition and higher applied frequency shifted glass transition temperature (Tg) to higher values. Furthermore, the multi-frequency measurement provided the degradation activation energy of the samples, where the highest value was reached by the 40% sample, i.e. 571.4 kJ. This result implied that there was a certain energetic barrier from the filler that the structural units of polymer need to surmount collectively before its viscous flow occured.