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Chinese Journal of Materials Research  2016, Vol. 30 Issue (1): 68-74    DOI: 10.11901/1005.3093.2015.010
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Compatibilizing Mechanism and Thermal Energy Storage of Polyacrylonitrile/Polyethylene Glycol Blends
QI Shanwei, GUO Jing**(), YU Chunfang, MU Siyang, YANG Lijun
Dalian Polytechnic University, Dalian 116034, China
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QI Shanwei, GUO Jing, YU Chunfang, MU Siyang, YANG Lijun. Compatibilizing Mechanism and Thermal Energy Storage of Polyacrylonitrile/Polyethylene Glycol Blends. Chinese Journal of Materials Research, 2016, 30(1): 68-74.

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Abstract  

Polyethylene glycol (PEG)/ polyacrylonitrile (PAN) shape-stabilized phase-change materials were prepared by blending acrylonitrile (AN) with copolymer P (AN-co-IA) as compatibilizer, which was copolymerized with itaconic acid (IA) and acrylonitrile/itaconic acid. First the compatibilizing mechanism of P (AN-co-IA) was analyzed and discussed, then the chemical composition, thermal insulation properties, thermal properties and crystallinity of the blend materials were investigated by FT-IR, cooling curve, differential scanning calorimetry (DSC), XRD and polarizing microscope (POM). The results show that the blends exhibit excellent insulation properties and have a large enthalpy; the solid- solid phase transition temperature and enthalpy increased with the increasing content of PEG; after cyclic heating for a limited cycles, the phase transition temperature and enthalpy had no significant changes which implies a good durability of heat storage of the blends.
Key words:  organic polymer materials      polyethylene glycol      polyacrylonitrile      compatibilizing mechanism      phase transition material     
Received:  06 January 2015     
Fund: *Supported by National Natural Science Foundation of China No.51373027
About author:  **To whom correspondence should be addressed, Tel: 13704091879, E-mail: guojing8161@163.com
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Shanwei QI
Jing GUO
Chunfang YU
Siyang MU
Lijun YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.010     OR     https://www.cjmr.org/EN/Y2016/V30/I1/68

Sample 1# 2# 3# 4# 5# 6#
Mass ratio of
PEG/PAN		 2.5:7.5 3:7 3.5:6.5 4:6 4.5:5.5 5:5
P(AN-co-IA) 3% 3% 3% 3% 3% 3%
Table 1  PAN/P(AN-co-IA)/PEG blends
Fig.1  FTIR spectra of P(AN-co-IA)
Fig.2  Compatibilizing Mechanism of P(AN-co-IA) on PAN/PEG blends
Fig.3  FTIR spectra of PEG、PAN and blends
Fig.4  Cooling curve of the PEG and different blends
Fig.5  Morphological comparison chart of PEG and blends before heating and after heating (a) PEG, (b) blends
Fig.6  DSC curves of 1#、4#、6 #blends
Sample Tc (℃) △Hm(J/g) Tm(℃) △Hc(J/g) Phase behavior
1# 27.58 19.51 56.21 14.33 solid-solid
4# 33.09 44.31 56.07 37.44 solid-solid
6# 35.74 64.23 57.24 57.87 solid-solid
Table 2  DSC parameters of 1#、4#、6# blends
Fig.7  DSC cycle curves of 6# blends
Cycle index Tc (℃) △Hc(J/g) Tm(℃) △Hm(J/g)
1 34.56 46.84 57.03 57.85
2 35.53 45.58 57.59 52.63
3 35.36 46.55 57.76 52.63
4 35.20 46.26 57.59 52.90
Table 3  DSC parameters of blend 6# in the process of circulation
Fig.8  XRD of PEG、PAN and the different blends
Fig.9  Cool crystal morphology of 1#、2#、4#、6# blends
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