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Thermal and mechanical properties of nanofibers-based form-stable PCMs consisting of glycerol monostearate and polyethylene terephthalate

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Abstract

An innovative type of nanofibers-based form-stable composite phase change materials for the storage and retrieval of thermal energy was successfully prepared by encapsulating glycerol monostearate (GMS) into the porous structure of polyethylene terephthalate (PET)-supporting matrices on the nanoscale through electrospinning. The field-emission scanning electron microscopy and transmission electron microscopy images revealed that the composite nanofibers possessed desired morphologies with the average fiber diameters ranging from about 290 to 1000 nm which increased with the contents of GMS. The two phase separation (e.g., GMS phase and PET phase) was clearly observed from the images. When GMS content reached 60 %, the amount of the GMS distributing on the surface of the composite nanofibers was significantly increased during the electrospinning. The Fourier transform infrared spectroscopy spectrum proved that the PET supporting matrices were physically combined with GMS molecules. The differential scanning calorimetry analysis indicated that the GMS/PET composite nanofibers had reversible phase change behaviors, and the melting enthalpies increased from 32.63 to 66.99 kJ kg−1 with increasing GMS amount. The TG results showed that both the onset thermal degradation temperature and charred residue of the GMS/PET composite nanofibers at 700 °C were higher than those of pristine GMS powder owing to the better thermal stability of the PET molecules. The tensile testing revealed that the averaged tensile strength and elongation at break of the all GMS/PET composite nanofibers varied from 3.29 to 10.30 MPa and from 2.42 to 42.30 %, respectively.

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Acknowledgements

This research was financially supported by the National High-tech R&D Program of China (No.2012AA030313), Changjiang Scholars and Innovative Research Team in University (No.IRT1135), the National Natural Science Foundation of China (No.51006046 and No.51203064), the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Industry-Academia-Research Joint Innovation Fund of Jiangsu Province (BY2012068), the Science and Technology Support Program of Jiangsu Province (SBE201201094), the Natural Science Fundation of Jiangsu Province (BK2010140), the Doctor Candidate Foundation of Jiangnan University (JUDCF12023), and the Innovation Program for Graduate Education in Jiangsu Province (No. CXZZ12_0747).

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Authors and Affiliations

  1. Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, Jiangsu, China

    Huizhen Ke, Dawei Li, Xiaoling Wang, Hong Wang, Yibing Cai, Yang Xu, Fenglin Huang & Qufu Wei

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  1. Huizhen Ke
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  2. Dawei Li
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Correspondence to Qufu Wei.

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Ke, H., Li, D., Wang, X. et al. Thermal and mechanical properties of nanofibers-based form-stable PCMs consisting of glycerol monostearate and polyethylene terephthalate. J Therm Anal Calorim 114, 101–111 (2013). https://doi.org/10.1007/s10973-012-2856-7

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