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Effect of N-isopropylacrylamide on the preparation and properties of microencapsulated phase change materials

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  • Li, Dan
  • Wang, Jianping
  • Wang, Yanan
  • Li, Wei
  • Wang, Xuechen
  • Shi, Haifeng
  • Zhang, Xingxiang

Abstract

NIPAm (N-isopropylacrylamide), a thermosensitive monomer, was introduced into a system for synthesis of MicroPCMs (microencapsulated phase change materials) through free radical emulsion polymerization with n-oct (n-octadecane) as the core and cross-linked PMMA (poly (methyl methacrylate)) as the shell. The effect of NIPAm on the formation mechanism, surface morphologies, crystallization properties, and thermal stabilities of the MicroPCMs were studied using FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy), DSC (differential scanning calorimetry), and TGA (thermogravimetric analysis), respectively. The results indicate that addition of NIPAm causes a significant increase in the enthalpy of the heterogeneous nucleation (approximately 2–4 times more than without NIPAm). The diameter distribution of microcapsules becomes narrower (the PDI (polydispersity index) has a minimum of 0.073) and the encapsulation ratio and encapsulation efficiency increase. On the contrary, the microcapsules that have some irregular holes were obtained by adding NIPAm prepolymer.

Suggested Citation

  • Li, Dan & Wang, Jianping & Wang, Yanan & Li, Wei & Wang, Xuechen & Shi, Haifeng & Zhang, Xingxiang, 2016. "Effect of N-isopropylacrylamide on the preparation and properties of microencapsulated phase change materials," Energy, Elsevier, vol. 106(C), pages 221-230.
    • Handle: RePEc:eee:energy:v:106:y:2016:i:c:p:221-230
    DOI: 10.1016/j.energy.2016.03.035
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    2. Cao, Rui-rui & Li, Xuan & Chen, Sai & Yuan, Hao-ran & Zhang, Xing-xiang, 2017. "Fabrication and characterization of novel shape-stabilized synergistic phase change materials based on PHDA/GO composites," Energy, Elsevier, vol. 138(C), pages 157-166.

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