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-.

Ionic effects on the mechanical and swelling properties of a poly(acrylic acid/acrylamide) double crosslinking hydrogel

2018 ◽  
Vol 42 (11) ◽  
pp. 9151-9158 ◽  
Author(s):  
Huijuan Zhang ◽  
Yuran Cheng ◽  
Xinjuan Hou ◽  
Biao Yang ◽  
Fang Guo
Keyword(s):  
Tensile Strength ◽  
Hydrogen Bonding ◽  
Acrylic Acid ◽  
Molecular Simulation ◽  
Metal Salts ◽  
Swelling Properties ◽  
Ionic Effects ◽  
Poly Acrylic Acid

A P(AA/AM)–Fe(NO3)3 double crosslinking gel showed a superior tensile strength of 1471 kPa compared to those of all other metal salts tested, which was demonstrated by molecular simulation to result from the stronger hydrogen bonding in this metal–(COO)n complex.

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.

Preparation of Poly Acrylic Acid Acrylamide Nanometer Material and its Drug Delivery Control Potential in Alkaline Condition

2016 ◽  
Vol 873 ◽  
pp. 84-88 ◽  
Author(s):  
Li Juan Feng ◽  
Jin Xiu Yuan ◽  
Hai Bo Lei ◽  
Xing Rong Zheng
Keyword(s):  
Drug Delivery ◽  
Acrylic Acid ◽  
Alkaline Condition ◽  
Control Potential ◽  
Swelling Properties ◽  
Control Drug ◽  
Nanometer Material ◽  
Ph Range ◽  
Degradation Properties ◽  
Poly Acrylic Acid

In order to explore a smart carrier which can control drug delivery in special pH environment, a type of nanometer material, namely, poly acrylic acid acrylamide (P(AA-AM)) was synthesized with acrylic acid and acrylamide as monomers. Its structure was determined using Fourier transform infrared spectroscopy (FTIR) and its swelling properties were tested by measuring its weight evolution. The drug delivery control potential was estimated by monitoring its swelling performances in the solutions of different pH values. The cycle characteristics were also investigated to determine its degradation properties in the environment. The results indicate that the synthesized material is sensitive to pH and is suitable for controlling drug delivery at the pH range from 10 to11 and below 7. Furthermore, this material can be automatic decomposition in the environment so that it is a degradable green material without causing burden to the environment.

Dynamics and Energetics of the Self-Assembly of a Hydrophobically Modified Polyelectrolyte:  Naphthalene-Labeled Poly(Acrylic Acid)

2005 ◽  
Vol 109 (23) ◽  
pp. 11478-11492 ◽  
Author(s):  
Telma Costa ◽  
Maria da G. Miguel ◽  
Björn Lindman ◽  
Karin Schillén ◽  
J. Sérgio Seixas de Melo
Keyword(s):  
Acrylic Acid ◽  
Self Assembly ◽  
The Self ◽  
Hydrophobically Modified ◽  
Hydrophobically Modified Polyelectrolyte ◽  
Poly Acrylic Acid
Sign in / Sign up

Export Citation Format

Share Document