纤维素纳米纤维增强聚砜膜的制备与表征

Preparation and Characterization of Polysulfone Membranes Reinforced with Cellulose Nanofibers.

作者信息

Alasfar Reema H, Kochkodan Viktor, Ahzi Said, Barth Nicolas, Koç Muammer

机构信息

Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Education City, Doha P.O. Box 34110, Qatar.

Qatar Environment and Energy Research Institute, Hamad bin Khalifa University, Qatar Foundation, Education City, Doha P.O. Box 34110, Qatar.

出版信息

Polymers (Basel). 2022 Aug 15;14(16):3317. doi: 10.3390/polym14163317.

DOI:10.3390/polym14163317

PMID:36015574

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9416018/

Abstract

The mechanical properties of polymeric membranes are very important in water treatment applications. In this study, polysulfone (PSF) membranes with different loadings of cellulose nanofibers (CNFs) were prepared via the phase inversion method. CNF was characterized through transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The pore morphology, mechanical properties, membrane performance and hydrophilicity of pure PSF membranes and PSF/CNF membranes were investigated. The changes in membrane pore structure with the addition of different CNF contents were observed using SEM images. It was shown that the calculated membrane pore sizes correlate with the membrane water fluxes. The pure water flux (PWF) of fabricated membranes increased with the addition of CNFs into the PSF matrix. It was shown that the optimal CNF loading of 0.3 wt.% CNF improved both the elastic modulus and yield stress of the PSF/CNF membranes by 34% and 32%, respectively (corresponds to values of 234.5 MPa and 5.03 MPa, respectively). This result indicates a strong interfacial interaction between the PSF matrix and the reinforced nanofibers. The calculated compaction factor (CF) showed that the membrane resistance to compaction could be improved with CNF reinforcement. Compared to pure PSF membrane, the hydrophilicity was significantly enhanced with the incorporation of 0.1 wt.%, 0.2 wt.% and 0.3 wt.% CNF, as shown by the water contact angle (WCA) results. It can be concluded that CNFs are homogeneously dispersed within the PSF matrix at CNF loading less than 0.5 wt.%.

摘要

聚合物膜的机械性能在水处理应用中非常重要。在本研究中，通过相转化法制备了具有不同纤维素纳米纤维（CNF）负载量的聚砜（PSF）膜。通过透射电子显微镜（TEM）和扫描电子显微镜（SEM）对CNF进行了表征。研究了纯PSF膜和PSF/CNF膜的孔形态、机械性能、膜性能和亲水性。使用SEM图像观察了添加不同CNF含量时膜孔结构的变化。结果表明，计算得到的膜孔径与膜水通量相关。将CNF添加到PSF基质中后，所制备膜的纯水通量（PWF）增加。结果表明，0.3 wt.%的最佳CNF负载量分别使PSF/CNF膜的弹性模量和屈服应力提高了34%和32%（分别对应于234.5 MPa和5.03 MPa的值）。该结果表明PSF基质与增强纳米纤维之间存在强烈的界面相互作用。计算得到的压实因子（CF）表明，CNF增强可提高膜的抗压实性能。水接触角（WCA）结果表明，与纯PSF膜相比，加入0.1 wt.%、0.2 wt.%和0.3 wt.%的CNF后，亲水性显著增强。可以得出结论，在CNF负载量小于0.5 wt.%时，CNF均匀分散在PSF基质中。