Citation: Lin-xia Fu, Yi-yu Feng, Wei Feng. Photo-thermal Storage and Release of an Azobenzene-grafted Polynorbornene Film[J]. Acta Polymerica Sinica, ;2019, 50(12): 1272-1279. doi: 10.11777/j.issn1000-3304.2019.19092 shu

Photo-thermal Storage and Release of an Azobenzene-grafted Polynorbornene Film

School of Materials Science and Engineering, Tianjin University, Tianjin 300072

Corresponding author: Wei Feng, weifeng@tju.edu.cn
Received Date: 5 May 2019
Revised Date: 10 May 2019
Available Online: 18 June 2019

The poor film-formation ability of azobenzene carbon thermal storage materials with graphene as templates limits their practical application due to the rigid structure of graphene sp2 hybridization. In this study, we addressed this issue by employing polynorbornene as the templelate given that polymers much outperform graphene in terms of film formation, flexibility, and self-supporting property. Herein, azobenzene attached with two methoxy and two carboxyl groups was firstly synthesized to regulate the photoisomerization and energy density. Next, polynorbornene (PNB) templates with various molecular weights were prepared by ring-opening metathesis polymerization (ROMP) with different molar ratios between monomer and catalyst. Azobenzene was then grafted onto the side chain of PNB through amidation reaction to afford azobenzene-grafted polynorbornenes with diverse grafting densities. Experimental results showed that with the increasing molecular weight of PNB template, the graft density of azobenzene rose first but subsequently fell. As for the film formation ability, PNB-Azo-500 with the highest graft density (36%) could hardly form an intact film, while PNB-Azo-900 exhibited the best film formation ability despite a slightly lower graft density (31%). Therefore, PNB-Azo-900 was involved in the following measurements. Tensile testing indicated that the PNB-Azo-900 film possessed good flexibility and self-supporting behavior by achieving a strain of 120% and a tensile strength of 21.5 MPa. Photoisomerization and energy density was characterized by UV-absorption spectroscopy and differential scanning calorimetry, respectively, which suggested that the film effectuated energy storage under 365 nm UV-light irradiation and the energy density reached 34 Wh/kg. The stored energy could be released as heat when the film was expoed to 550 nm green light or heat source stimulation, during which the highest temperature was 1.25 °C. Such excellent energy storage and light responsiveness endowed this PBN film with potential applications in the field of space thermal management.
- Ring-opening metathesis polymerization,
- Polymer template,
- Flexible film,
- Azobenzene,
- Thermal release
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沈阳化工大学材料科学与工程学院沈阳 110142

Photo-thermal Storage and Release of an Azobenzene-grafted Polynorbornene Film

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com