A novel shape-stabilized PEG/novolac resin by sol–gel polymerization

In this study, a novel polyethylene glycol (PEG)/novolac shape-stabilized, composite, phase-change material was prepared with various mass fractions of PEG via sol–gel polymerization. The influences of PEG content on morphology, crystallinity, phase-change enthalpy efficiency and shift of melt tempe...

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Bibliographic Details
Published in:Iranian polymer journal 2016-10, Vol.25 (10), p.823-829
Main Authors: Nasiri, Mina, Bahramian, Ahmad Reza, Raeisi, Hamidreza Hadizadeh
Format: Article
Language:English
Subjects:
Ceramics
Chemical reactions
Chemistry
Chemistry and Materials Science
Colloid chemistry
Composites
Cooling effects
Glass
Infrared spectroscopy
Natural Materials
Original Paper
Polyethylene glycol
Polymer Sciences
Polymerization
Sol-gel processes
Supercooling
Thermodynamic properties
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Summary:In this study, a novel polyethylene glycol (PEG)/novolac shape-stabilized, composite, phase-change material was prepared with various mass fractions of PEG via sol–gel polymerization. The influences of PEG content on morphology, crystallinity, phase-change enthalpy efficiency and shift of melt temperature of the phase-change materials (super cooling effect) were investigated. Fourier transform infrared spectroscopy indicated no chemical reaction during the composite preparation and showed O–H bonding intensity increased with increase of novolac content. Field emission scanning electron microscopy images of the shape-stabilized phase-change material showed trapping of PEG chains into colloidal structure of novolac even at mass fraction of novolac as low as 10 wt%. Differential scanning calorimetry and X-ray diffraction techniques revealed well thermal properties of samples regarding phase-change material enthalpy as compared to their bulk forms. Among prepared samples in this work, samples with 15 wt% novolac showed improved phase-change enthalpy and crystallinity as compared to neat PEG. This work not only supplied efficient shape-stabilized phase-change materials without PCM leakage, but also improved the melt enthalpy and crystallinity of this new shape-stabilized PCM systems. This system give the opportunity to have improved phase change enthalpy and crystallization behavior of sample with 85 wt% of PEG in comparison to neat PEG.
ISSN:1026-1265
1735-5265
DOI:10.1007/s13726-016-0476-y