Novel Covalently Cross-Linked Attapulgite/Poly(acrylic acid-co-acrylamide) Hybrid Hydrogels by Inverse Suspension Polymerization: Synthesis Optimization and Evaluation as Adsorbents for Toxic Heavy Metals

2014 ◽  
Vol 53 (11) ◽  
pp. 4277-4285 ◽  
Author(s):  
Peng Liu ◽  
Liping Jiang ◽  
Longxiang Zhu ◽  
Aiqin Wang
Keyword(s):  
Heavy Metals ◽  
Acrylic Acid ◽  
Suspension Polymerization ◽  
Toxic Heavy Metals ◽  
Inverse Suspension Polymerization ◽  
Hybrid Hydrogels ◽  
Poly Acrylic Acid

Effect of the Ion Strengths in Different Salt Solutions on the Absorbencies of Poly(acrylic acid-co-acrylamide) Superabsorbent by Inverse Suspension Polymerization

2012 ◽  
Vol 550-553 ◽  
pp. 711-715
Author(s):  
Jian Jun Xie ◽  
Qing Xin Yao ◽  
Nian Zeng ◽  
Chu Ding
Keyword(s):  
Acrylic Acid ◽  
Metal Cation ◽  
Suspension Polymerization ◽  
The Self ◽  
Salt Solutions ◽  
Swelling Properties ◽  
Anionic Group ◽  
Inverse Suspension Polymerization ◽  
The Relationship ◽  
Poly Acrylic Acid

The absorbencies of poly(acrylic acid-co-acrylamide) (PAAM) are measured for the ion strengths of the salt solutions using the self-made PAAM by inverse suspension polymerization. The effects of various salt solutions on the swelling properties were studied systemically, and the relationship between the absorbency (Q) of PAAM and the concentrations of different salt solutions(c) could be expressed as Q=kcn. The absorbencies of PAAM decrease obviously with the ion strengths (less than 0.03mol/kg) and had no great change when the ion strengths were higher than 0.03mol/kg for the same solution systems. The absorbency decreased with an increase in charge of the metal cation. The absorbencies of the PAAM in the sodium solutions with different anion decreased with an increase of the ion strengths. However, the absorbencies increased with the increase in charge of the anionic group and were in order PO43->CO32->Cl-.

scholarly journals Superabsorbent poly(acrylic acid) and antioxidant poly(ester amide) hybrid hydrogel for enhanced wound healing

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Jianhua Zhang ◽  
Junfei Hu ◽  
Baoshu Chen ◽  
Tianbao Zhao ◽  
Zhipeng Gu
Keyword(s):  
Wound Healing ◽  
Acrylic Acid ◽  
Protein Denaturation ◽  
Healing Process ◽  
Antioxidant Properties ◽  
Skin Damage ◽  
Hybrid Hydrogel ◽  
Hydrogel Scaffolds ◽  
Hybrid Hydrogels ◽  
Poly Acrylic Acid

Abstract Wound healing dressing is increasingly needed in clinical owing to the large quantity of skin damage annually. Excessive reactive oxygen species (ROS) produced through internal or external environmental influences can lead to lipid peroxidation, protein denaturation, and even DNA damage, and ultimately have harmful effects on cells. Aiming to sufficiently contact with the wound microenvironment and scavenge ROS, superabsorbent poly (acrylic acid) and antioxidant poly (ester amide) (PAA/PEA) hybrid hydrogel has been developed to enhance wound healing. The physical and chemical properties of hybrid hydrogels were studied by Fourier-transform infrared (FTIR) absorption spectrum, compression, swelling, degradation, etc. Besides, the antioxidant properties of hybrid hydrogels can be investigated through the free radical scavenging experiment, and corresponding antioxidant indicators have been tested at the cellular level. Hybrid hydrogel scaffolds supported the proliferation of human umbilical vein endothelial cells and fibroblasts, as well as accelerated angiogenesis and skin regeneration in wounds. The healing properties of wounds in vivo were further assessed on mouse skin wounds. Results showed that PAA/PEA hybrid hydrogel scaffolds significantly accelerated the wound healing process through enhancing granulation formation and re-epithelialization. In summary, these superabsorbent and antioxidative hybrid hydrogels could be served as an excellent wound dressing for full-thickness wound healing.

Synthesis and Properties of Thermo- and pH-Sensitive Poly[(Sodium Humate)-(N-Isopropylacrylamide)-(Acrylic Acid)] Intelligent Hydrogel

2013 ◽  
Vol 781-784 ◽  
pp. 536-541
Author(s):  
Xiao Mi Zhou ◽  
Xiao Ran Sun ◽  
Guang Yue Li
Keyword(s):  
Acrylic Acid ◽  
Suspension Polymerization ◽  
Ammonium Persulfate ◽  
Continuous Phase ◽  
Ph Sensitive ◽  
Cross Linking ◽  
Swelling Ratio ◽  
Inverse Suspension Polymerization ◽  
Sensitive Characteristics ◽  
Intelligent Hydrogel

A novel intelligent hydrogel of poly(Humic acid - Nisopropylacrylamide - Acrylic acid) (P(NIPAAm-HA-AA)) was prepared at 70°C by inverse suspension polymerization. The reactions include uses N,N-methylene-bis-acrylamide (MBA) as a cross-linking agent, ammonium persulfate (KPS) as an initiator, cyclohexane as a continuous phase and span-65 as dispersant. The influence such as concentration of monomers and cross-linking agent, mole fraction of span-65 in mixed monomers, and temperature of polymerization on the property of resulting P(NIPAAm-HA-AA) hydrogels was investigated in detail. Fourier transform infrared (FTIR) demonstrated that NIPAAm, HA and AA was synthetized successfully. The results showed that the swelling ratio (SR) of modified hydrogel was improved significantly with the dosage of NIPAAm. It was also observed that the thermosensitive and pH sensitive characteristics was strongly affected by concentrations of NIPAAm. At last, we choose NIPAAm: HA=0.3.

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