Synthesis and Characterization of Poly(acrylonitrile-co-itaconate)-graft-Poly(ethylene glycol) Copolymers as Novel Solid-Solid Phase Change Materials for Thermal Energy Storage†

doi:10.7503/cjcu20150655

Abstract

Abstract:

The core of this study firstly synthesizes an “active” matrix materials with the itaconic acid containing double-carboxyl end group and acrylonitrile copolymer through molecular design. Then, the poly(ethy-lene glycol)(PEG) was grafted to the poly(acrylonitrile-co-itaconate)[P(AN-co-IA)] using methylenediphenyl diisocyanate(MDI) as a bridge-base and cross-linking agent. The poly(acrylonitrile-co-itaconate)-graft-poly(ethylene glycol)[P(AN-co-IA)-g-PEG] solid-solid phase change materials(SSPCMs) were obtained in this paper. Furthermore, the chemical structure, crystallization properties, thermal energy storage properties , crystallization process, thermal stabilities, and hydrophilic property of the SSPCMs were investigated using Fourier transform infrared, differential scanning calorimetry, wide-angle X-ray diffraction, polarized optical microscopy, thermogravimetric analysis and water contact angle, respectively. The results showed that these SSPCMs had the characteristics of solid-solid phase change, excellent energy storage properties and latent heat of 70 J/g or more. The crystalline morphology and crystal structures of the synthesized SSPCMs are difference from PEG and P(AN-co-IA). Moreover, The SSPCMs have a good thermal stability and the initial decomposition temperature(T_d) is 289 ℃, and the hydrophilic property of the blend membrane were improved, the water contact angle minimum can be achieved at 33.71°.

Key words: Solid-solid phase change material, Poly(ethylene glycol), Energy storage and conversion, Poly(acrylonitrile-co-itaconate)

CLC Number:

O631

TrendMD:

MU Siyang, GUO Jing, QI Shanwei, ZHANG Bo, ZHANG Hong, YU Yue. Synthesis and Characterization of Poly(acrylonitrile-co-itaconate)-graft-Poly(ethylene glycol) Copolymers as Novel Solid-Solid Phase Change Materials for Thermal Energy Storage^†[J]. Chem. J. Chinese Universities, 2015, 36(12): 2557.

Figures/Tables 9

Scheme 1 Synthetic routes of P(AN-co-IA)-g-PEG

Fig.1 FTIR spectra of PEG(a), P(AN-co-IA)(b) and AIPCMs-2(c)

Fig.2 DSC curves of AIPCMs with different PEG content(A, B) and crystallization curves of AIPCMs(C)

Table 1 Thermal energy storage properties of PEG and AIPCMs

Sample^*	T_c(on) /℃	ΔH_c/(J·g^-1)	T_m(on) /℃	ΔH_m/(J·g^-1)
PEG	44.52	178.3	66.14	184.8
AIPCMs-1	33.1	9.1	48.5	11.2
AIPCMs-2	39.52	32.1	53.43	32.4
AIPCMs-3	38.52	47.1	53.48	49.1
AIPCMs-4	38.57	69.2	53.58	70.5

Fig.3 DSC curves of AIPCMs after 5 cycles

Fig.4 XRD curves of PEG4000 and AIPCMs

Fig.5 POM images of AIPCMs-3(A, B) and PEG(C, D) at 80 ℃(A, C) and 20 ℃(B, D)

Fig.6 TGA curves of P(AN-co-IA)(a), PEG(b) and AIPCMs-2(c)

Fig.7 TGA curves of AIPCMs-1(a), AIPCMs-2(b), AIPCMs-3(c) and AIPCMs-4(d) Temperature range: (A) 0—600 ℃; (B) 230—340 ℃; (C) 380—450 ℃.

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