scholarly journals Assembly of Polyacrylamide-Sodium Alginate-Based Organic-Inorganic Hydrogel with Mechanical and Adsorption Properties

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1239 ◽  
Author(s):  
Yiying Yue ◽  
Xianhui Wang ◽  
Qinglin Wu ◽  
Jingquan Han ◽  
Jianchun Jiang
Keyword(s):  
Adsorption Capacity ◽  
Sodium Alginate ◽  
In Situ Polymerization ◽  
Polymer Network ◽  
High Water ◽  
Inorganic Nanoparticles ◽  
Interpenetrating Polymer Network ◽  
High Water Content ◽  
Strong Adsorption ◽  
Hollow Nanostructure

Hydrogels have been widely used in water purification. However, there is not much discussion and comparison about the effects of different nanofillers on the reinforcement and adsorption performances of hydrogels, which can be subjected to rapid water flow and possess strong adsorption ability. In this work, polyacrylamide (PAAM)-sodium alginate (SA) interpenetrating polymer network-structured hydrogels were prepared by in situ polymerization. PAAM formed the first flexible network and SA constructed the second rigid network. Three kinds of inorganic nanoparticles including carbon nanotubes (CNTs), nanoclays (NCs), and nanosilicas (NSs) were incorporated into a PAAM-SA matrix via hydrogen bond. The obtained hydrogels exhibited a macroporous structure with low density (≈1.4 g/cm3) and high water content (≈83%). Compared with neat PAAM-SA, the hydrogels with inorganic nanoparticles possessed excellent mechanical strengths and elasticities, and the compression strength of PAAM-SA-NS reached up to 1.3 MPa at ε = 60% by adding only 0.036 g NS in a 30 g polymer matrix. However, CNT was the best filler to improve the adsorption capacity owing to its multi-walled hollow nanostructure, and the adsorption capacity of PAAM-SA-CNT was 1.28 times higher than that of PAAM-SA. The prepared hydrogels can be potential candidates for use as absorbents to treat wastewater.

Preparation and Properties of Oxidized Coal/Polyaniline Composite Material

2011 ◽  
Vol 306-307 ◽  
pp. 220-223
Author(s):  
Xiao Ping Fan ◽  
An Ning Zhou
Keyword(s):  
Composite Material ◽  
In Situ Polymerization ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Hydroxyl Groups ◽  
Oxidized Coal ◽  
Pani Composite ◽  
Maximum Conductivity ◽  
Hydrolysis Of

Semi-interpenetrating polymer network of coal/polyaniline (PANI) composite material were prepared by in situ polymerization. Raw coal was oxidized in different conditions by H2O2 and HNO3, respectively. The total acidic groups analysis, Fourier transform infrared (FTIR) spectrum, and conductivity test of the raw coal and the oxidized coal/PANI composite material were conducted. The results showed that the increases of the carboxyl groups and the hydroxyl groups were mainly attributed to the hydrolysis of the weak ether link and the transform from the carboxylate to carboxylic acid. These increases were benefit to the reaction of coal and PANI, and consequently enhanced the conductivity of the composite material. The maximum conductivity of oxidized coal/PANI reached 4.72×10‑1 S/cm.

scholarly journals Preparation and Characterization of Salt-Mediated Injectable Thermosensitive Chitosan/Pectin Hydrogels for Cell Embedding and Culturing

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2674
Author(s):  
Giulia Morello ◽  
Alessandro Polini ◽  
Francesca Scalera ◽  
Riccardo Rizzo ◽  
Giuseppe Gigli ◽  
...  
Keyword(s):  
Sol Gel ◽  
Polymer Network ◽  
Cell Encapsulation ◽  
High Water ◽  
Biological Tissues ◽  
Culture Conditions ◽  
Interpenetrating Polymer Network ◽  
Sol Gel Transition

In recent years, growing attention has been directed to the development of 3D in vitro tissue models for the study of the physiopathological mechanisms behind organ functioning and diseases. Hydrogels, acting as 3D supporting architectures, allow cells to organize spatially more closely to what they physiologically experience in vivo. In this scenario, natural polymer hybrid hydrogels display marked biocompatibility and versatility, representing valid biomaterials for 3D in vitro studies. Here, thermosensitive injectable hydrogels constituted by chitosan and pectin were designed. We exploited the feature of chitosan to thermally undergo sol–gel transition upon the addition of salts, forming a compound that incorporates pectin into a semi-interpenetrating polymer network (semi-IPN). Three salt solutions were tested, namely, beta-glycerophosphate (βGP), phosphate buffer (PB) and sodium hydrogen carbonate (SHC). The hydrogel formulations (i) were injectable at room temperature, (ii) gelled at 37 °C and (iii) presented a physiological pH, suitable for cell encapsulation. Hydrogels were stable in culture conditions, were able to retain a high water amount and displayed an open and highly interconnected porosity and suitable mechanical properties, with Young’s modulus values in the range of soft biological tissues. The developed chitosan/pectin system can be successfully used as a 3D in vitro platform for studying tissue physiopathology.

Interpenetrating polymer network (IPN) scaffolds of sodium hyaluronate and sodium alginate for chondrocyte culture

2011 ◽  
Vol 88 (2) ◽  
pp. 711-716 ◽  
Author(s):  
Chung-Wook Chung ◽  
Jeong Yeon Kang ◽  
In-Soo Yoon ◽  
Hyung-Don Hwang ◽  
Prabagar Balakrishnan ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Polymer Network ◽  
Sodium Hyaluronate ◽  
Interpenetrating Polymer Network ◽  
Chondrocyte Culture
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