Zhang Yongsheng, Ma Jun, Bai Yao, Wen Youwei, Zhao Na, Zhang Xiaoling, Zhang Yatao, Li Qian, Wei Liuhe
School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 45001, China.
National Center for International Research of Micro-nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.
Nanomaterials (Basel). 2018 Dec 23;9(1):15. doi: 10.3390/nano9010015.
Petroleum depletion and climate change have inspired research on bio-based polymers and CO₂ capture. Tung-oil-based polyols were applied to partially replace polyether-type polyols from petroleum for sustainable polyurethane. Tung-oil-based polyurethane (TBPU), was prepared via a two-step polycondensation, that is, bulk prepolymerization and chain extension reaction. The graphene oxide (GO) was prepared via Hummer's method. Then, TBPU was composited with the GO at different ratios to form a TBPU/GO hybrid film. The GO/TBPU films were characterized by fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), thermal gravimetric analysis (TGA) and scanning electron microscope (SEM), followed by the measurement of mechanical properties and gas permeability. The results showed that the addition of tung-oil-based polyols enhanced the glass transition temperature and thermal stability of TBPU. The mechanical properties of the hybrid film were significantly improved, and the tensile strength and elongation at break were twice as high as those of the bulk TBPU film. When the GO content was higher than 2.0%, a brittle fracture appeared in the cross section of hybrid film. The increase of GO content in hybrid films improved the selectivity of CO₂/N₂ separation. When the GO content was higher than 0.35%, the resulting GO agglomeration constrained the gas separation and permeation properties.
石油枯竭和气候变化激发了对生物基聚合物和二氧化碳捕集的研究。基于桐油的多元醇被用于部分替代石油来源的聚醚型多元醇以制备可持续的聚氨酯。基于桐油的聚氨酯（TBPU）通过两步缩聚反应制备，即本体预聚反应和扩链反应。氧化石墨烯（GO）通过Hummer法制备。然后，将TBPU与不同比例的GO复合以形成TBPU/GO混合膜。通过傅里叶变换红外光谱（FTIR）、差示扫描量热仪（DSC）、热重分析（TGA）和扫描电子显微镜（SEM）对GO/TBPU膜进行表征，随后测量其力学性能和气体渗透性。结果表明，基于桐油的多元醇的加入提高了TBPU的玻璃化转变温度和热稳定性。混合膜的力学性能显著提高，拉伸强度和断裂伸长率是本体TBPU膜的两倍。当GO含量高于2.0%时，混合膜横截面出现脆性断裂。混合膜中GO含量的增加提高了CO₂/N₂分离的选择性。当GO含量高于0.35%时，形成的GO团聚体限制了气体分离和渗透性能。
