Preparation and properties of biodegradable multi-block copolymer/graphite oxide composite phase change materials
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Preparation and properties of biodegradable multi‑block copolymer/ graphite oxide composite phase change materials Xiaoming Zhou1 · Tianci Wu1 · Xiaoya Wang1 Received: 3 December 2018 / Accepted: 24 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract A novel biodegradable solid–solid phase change heat storage composite materials (GO-PBSEG) were synthesized by in situ polymerization reaction of high molecular weight poly(ethylene glycol) (PEG4000) with succinic acid, 1,4-butanediol (BD) and graphite oxide (GO). PEG was used as a working substance in GO-PBSEG composite materials. To characterize the resulting product, Fourier transform infrared spectroscopy, NMR spectrometer, differential scanning calorimetry, thermal constant analyzer, polarization optical microscopy measurements and scanning electron microscopy were employed to investigate the structure, thermal properties, crystalline behavior and enzymatic degradation of phase change materials. The experimental results indicated that the GO-PBSEG composite materials showed typical solid–solid phase transition properties, and the exothermic phase change enthalpy of PEG unit reached 64.8 J g−1. With the increase in GO content, the thermal conductivity properties of composite materials were improved, and the enzymatic degradation rate gradually increased. POM observations indicated that the 1.0 mass% GO-PBSEG sample had the largest spherulites and the lowest nucleation ability. Keywords Solid–solid phase change · GO-PBSEG composite materials · Thermal conductivity properties · Enzymatic degradation
Introduction The solid–solid phase change materials (SSPCMs) are through the solidification phase change for energy storage and release. There is no liquid and the generation or leakage of gas during the phase change. SSPCMs have a wide range of applications, such as solar energy storage, waste heat recovery, smart air conditioning buildings, temperature adaptable greenhouses, insulation clothing, and so on. Some chemical and physical methods have been used to prepare solid–solid phase change materials [1–3]. Chemical methods include graft copolymerization and block copolymerization. The crystalline polymer segments are grafted onto another skeleton polymer with high melting point, high strength and stable structure by graft copolymerization reaction. The crystalline polymer * Xiaoming Zhou [email protected] 1
College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin Economic‑Technological Development Area, Tianjin 300457, People’s Republic of China
segments with low melting point undergo phase transitions from crystalline to amorphous during the heating process. At this point, the polymer backbone with high melting point has not yet melted, limiting the flow of macromolecules with low melting point, maintaining the overall solid state of the material. Polyethylene glycol (PEG) has a high phase change enthalpy and a lower phase transition temperature, low toxicity and biodegradable characteris
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