Synthesis and Water Absorbency of Poly(acrylic acid-co-acrylamide)

2011 ◽  
Vol 250-253 ◽  
pp. 695-698 ◽  
Author(s):  
Ting Xi Li ◽  
Na Kong ◽  
Su Su Gao ◽  
Peng Sui ◽  
Yu Hua Zhao ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Water Absorption ◽  
Aluminum Hydroxide ◽  
Potassium Persulfate ◽  
Molar Ratio ◽  
Water Absorbency ◽  
Mass Ratio ◽  
New Type ◽  
Poly Acrylic Acid

A new type of poly (acrylic acid-co-acrylamide) was synthesized by copolymerization method using acrylic acid (AA) and acrylamide (AM) as monomer. Synthesis technology was as follow: the acrylamide and acrylic acid molar ratio was 0.3-0.4, the temperature was 55-60°C, the degree of neutralization of AA was 70%, the potassium persulfate and monomer mass ratio was 0.2%-0.3%, the aluminum hydroxide and monomer mass radio was 0.03%-0.05%. The water absorption was more than thousands of times.

Synthetic and Performance Research on the New Type Hydrogel with Acrylic Acid and Acrylamide Unit

2013 ◽  
Vol 864-867 ◽  
pp. 690-693
Author(s):  
Wu Zhang ◽  
Lina Hou ◽  
Ling Li ◽  
Yun Dong Fang ◽  
Chun Zheng Song ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Sodium Sulfite ◽  
Orthogonal Experiment ◽  
Gel Strength ◽  
Molar Ratio ◽  
Water Absorbency ◽  
New Type ◽  
And Performance ◽  
Optimized Conditions ◽  
Performance Research

High acrylamide content hydrogel was synthesized under mild condition through a copolymerization reaction between acrylic acid (AA) and acrylamide (AM) using N, N-methylenebis-acrylamide as crosslinker and potassium persulfate combination with sodium sulfite as initiator in aqueous solution. The factors with influence on water absorbency performance including molar ratio of AM to AA, neutralization degree, content of crosslinker and initiator were investigated. Further orthogonal experiment with four factors and three levels were employed to determine the optimized conditions, in which not only water absorbency but also gel strength was taken into account.

Dually cross-linked single network poly(acrylic acid) hydrogels with superior mechanical properties and water absorbency

Soft Matter ◽  
2016 ◽  
Vol 12 (24) ◽  
pp. 5420-5428 ◽  
Author(s):  
Ming Zhong ◽  
Yi-Tao Liu ◽  
Xiao-Ying Liu ◽  
Fu-Kuan Shi ◽  
Li-Qin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Acrylic Acid ◽  
Water Absorbency ◽  
Superior Mechanical Properties ◽  
Poly Acrylic Acid

Ultrasonic Synthesis and Properties of Sodium Lignosulfonate-grafted Poly(Acrylic Acid-co-Vinyl Alcohol) Composite Superabsorbent Polymer

2016 ◽  
Vol 69 (10) ◽  
pp. 1155 ◽  
Author(s):  
Chen Hao ◽  
Jun Li ◽  
Qiang He ◽  
Zilong Zhou ◽  
Xiaowei Guo ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Vinyl Alcohol ◽  
High Efficiency ◽  
Orthogonal Experiment ◽  
Physiological Saline ◽  
Water Absorbency ◽  
Superabsorbent Polymer ◽  
Sodium Lignosulfonate ◽  
Scanning Calorimetry ◽  
Poly Acrylic Acid

In this paper, a green and high-efficiency method (ultrasound synthesis) has been applied in the preparation of a sodium lignosulfonate-grafted poly(acrylic acid-co-vinyl alcohol) superabsorbent polymer (SL-P(AA-co-VA)). By Fourier-transform infrared spectroscopy, scanning electron microscopy, and thermogravimetry–differential scanning calorimetry, the successful preparation was confirmed. An L16(4)5 orthogonal experiment was carried out to optimize synthetic conditions for SL-P(AA-co-VA). Under the optimized synthetic conditions, maximum water absorbency (949 g g–1) and physiological saline absorbency (62 g g–1) were achieved. Adjusting pH reduces the water absorbency of SL-P(AA-co-VA), as does the presence of metal ions. However, a rise in temperature does not have a significant influence on it. In general, both the water absorbency and physiological saline absorbency of SL-P(AA-co-VA) were significantly improved versus P(AA-co-VA) superabsorbent.

scholarly journals Fabrication of an Organo-Fluoride–Free Hydrophobic Film Using the Sol-Gel Method by Factors Screening and Poly-Acrylic Acid Addition

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1011
Author(s):  
Meng-Wei Shen ◽  
Shyi-Tien Chen
Keyword(s):  
Acrylic Acid ◽  
Sol Gel ◽  
Weight Ratio ◽  
Hydrophobic Surface ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Static Water ◽  
Clustering Aggregation ◽  
Poly Acrylic Acid

Improving silica film’s contact angle (CA) using tetraethoxysilane (TEOS) and iso-butyltrimethoxysilane (iso-BTMS) by the sol-gel method without adding organo-fluoride substances is of interest. Five factors, namely type of solvent, molar ratio and amounts of TEOS and iso-BTMS, mixing intensity, sol aging time, and presence and absence of poly-acrylic acid (PAA), were assessed to improve the static water CA of the film and its surface quality. Results revealed that when ethanol was used as the dissolving solvent and after adding initial iso-BTMS and TEOS concentrations of 0.0270 and 0.0194 mol/L (molar ratio = 1.39), respectively, without sonication and adding PAA/TEOS weight ratio of 0.029, then the maximum static CA of the film reached 147°, a nearly super-hydrophobic surface. Under given conditions, long-term film durability was observed, and the added PAA prevented the formation of nonhomogeneous film surfaces caused by the highly clustering aggregation of silanols under high pH conditions.

Preparation and swelling properties of poly(acrylic acid-co-acrylamide) composite hydrogels

e-Polymers ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 95-106 ◽  
Author(s):  
Wei-Min Cheng ◽  
Xiang-Ming Hu ◽  
Yan-Yun Zhao ◽  
Ming-Yue Wu ◽  
Zun-Xiang Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Salt Tolerance ◽  
Acrylic Acid ◽  
Water Absorption ◽  
Crosslinking Agent ◽  
Salt Resistance ◽  
Composite Hydrogel ◽  
Swelling Properties ◽  
Unfavorable Effect ◽  
Poly Acrylic Acid

AbstractIn order to study the effect of composite clays on the mechanical properties, water absorption and salt tolerance of a hydrogel, a poly(acrylic acid-co-acrylamide)/bentonite/kaolin composite hydrogel was prepared. Acrylic acid and acrylamide have been used as water absorbent monomers. N,N′-methylene bisacrylamide was used as a crosslinking agent while potassium persulfate was used as an initiator. The water preserving capability, repeated water absorption, salt resistance and the mechanical properties of the composite hydrogel are analyzed and discussed. The results show that a small quantity of bentonite can increase the storage modulus of the composite hydrogel, whereas the excess clay had an unfavorable effect on the mechanical strength of the composite hydrogel. Both bentonite and kaolin significantly improved the water preserving capability, repeated water absorption and salt resistance of the composite hydrogel. Optimum values for the amounts of bentonite and kaolin were found to be 10% and 5%, respectively.

scholarly journals Super water absorbency OMMT/PAA hydrogel materials with excellent mechanical properties

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14504-14510 ◽  
Author(s):  
Yuqi Zhang ◽  
Yao Liu ◽  
Jiaqi Liu ◽  
Pu Guo ◽  
Liping Heng
Keyword(s):  
Mechanical Properties ◽  
Acrylic Acid ◽  
Uv Irradiation ◽  
Water Absorbency ◽  
Composite Hydrogels ◽  
Poly Acrylic Acid

Montmorillonite/poly(acrylic acid) composite hydrogels, fabricated through UV irradiation polymerization, have a super water absorbency of 2786 g g−1 and excellent mechanical properties.

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