Facile Fabrication of Composite Membranes with Dual Thermo- and pH-Responsive Characteristics

2017 ◽  
Vol 9 (16) ◽  
pp. 14409-14421 ◽  
Author(s):  
Bing Ma ◽  
Xiao-Jie Ju ◽  
Feng Luo ◽  
Yu-Qiong Liu ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Ph Responsive ◽  
Facile Fabrication

scholarly journals Facile Fabrication of Methylcellulose/PLA Membrane with Improved Properties

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 499 ◽  
Author(s):  
Panjie Guo ◽  
Fen Wang ◽  
Tongtong Duo ◽  
Zhihong Xiao ◽  
Airong Xu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Composite Membranes ◽  
Hot Compression ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Good Thermal Stability ◽  
Biodegradable Composite ◽  
Microscopy Technique ◽  
Nmr Techniques ◽  
Facile Fabrication

With the rapid exhaustion of fossil resources, and environmental pollution relative to the use of fossil-based products, developing eco-friendly products using biomass and/or biodegradable resources is becoming increasingly conspicuous. In this study, ecofriendly and biodegradable composite membranes containing varying MC/PLA (methylcellulose/polylactic acid) mass ratios were prepared. The properties and structures of the MC/PLA membranes were studied by mechanical testing, 13C NMR techniques, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and hot compression. The MC/PLA membranes displayed markedly improved tensile strength and elongation at the MC/PLA mass ratio range of 99:1 to 9:1. The tensile strength and elongation of the MC/PLA (97:3) membrane was found to be the optimum, at 30% and 35% higher than the neat MC, respectively. It was also found that hot compression could improve the tensile strength and elongation of the membranes. At the same time, the membranes showed enough good thermal stability. In addition, the effect of MC/PLA mass ratio on morphologies of the membranes were studied by microscopy technique.

scholarly journals An In Situ Incorporation of Acrylic Acid and ZnO Nanoparticles into Polyamide Thin Film Composite Membranes for Their Effect on Membrane pH Responsive Behavior

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 910
Author(s):  
Kgolofelo I. Malatjie ◽  
Bhekani S. Mbuli ◽  
Richard M. Moutloali ◽  
Catherine J. Ngila
Keyword(s):  
Thin Film ◽  
Acrylic Acid ◽  
Water Permeability ◽  
Zno Nanoparticles ◽  
Composite Membranes ◽  
Ph Responsive ◽  
Film Composite ◽  
Water Permeation ◽  
Thin Film Composite

This paper focuses on an in situ interfacial polymerization modification of polyamide thin film composite membranes with acrylic acid (AA) and zinc oxide (ZnO) nanoparticles. Consequent to this modification, the modified polyamide thin film composite (PA–TFC) membranes exhibited enhanced water permeability and Pb (II) heavy metal rejection. For example, the 0.50:1.50% ZnO/AA modified membranes showed water permeability of 29.85 ± 0.06 L·m−2·h−1·kPa−1 (pH 3), 4.16 ± 0.39 L·m−2·h−1·kPa−1 (pH 7), and 2.80 ± 0.21 L·m−2·h−1·kPa−1 1 (pH 11). This demonstrated enhanced pH responsive properties, and improved water permeability properties against unmodified membranes (2.29 ± 0.59 L·m−2·h−1·kPa−1, 1.79 ± 0.27 L·m−2·h−1·kPa−1, and 0.90 ± 0.21 L·m−2·h−1·kPa−1, respectively). Furthermore, the rejection of Pb (II) ions by the modified PA–TFC membranes was found to be 16.11 ± 0.12% (pH 3), 30.58 ± 0.33% (pH 7), and 96.67 ± 0.09% (pH 11). Additionally, the membranes modified with AA and ZnO/AA demonstrated a significant pH responsiveness compared to membranes modified with only ZnO nanoparticles and unmodified membranes. As such, this demonstrated the swelling behavior due to the inherent “gate effect” of the modified membranes. This was illustrated by the rejection and water permeation behavior, hydrophilic properties, and ion exchange capacity of the modified membranes. The pH responsiveness for the modified membranes was due to the –COOH and –OH functional groups introduced by the AA hydrogel and ZnO nanoparticles.

Preparation of pH-responsive ceramic composite membranes by grafting acrylic acid onto α-alumina membranes

2009 ◽  
Vol 54 (12) ◽  
pp. 2147-2149 ◽  
Author(s):  
LianLi Yang ◽  
YiJiang Zhao ◽  
ShouYong Zhou ◽  
MeiSheng Li ◽  
Yan Chen ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Ceramic Composite ◽  
Composite Membranes ◽  
Ph Responsive ◽  
Alumina Membranes
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