Bending of poly(vinyl alcohol)–poly(sodium acrylate) composite hydrogel in electric fields

1992 ◽  
Vol 44 (2) ◽  
pp. 249-253 ◽  
Author(s):  
Tohru Shiga ◽  
Yoshiharu Hirose ◽  
Akane Okada ◽  
Toshio Kurauchi
Keyword(s):  
Electric Fields ◽  
Vinyl Alcohol ◽  
Composite Hydrogel ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol

Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane

2016 ◽  
Vol 852 ◽  
pp. 979-983
Author(s):  
Ping Rui Meng ◽  
Liang Bo Li
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol ◽  
Permeate Flux ◽  
Ft Ir ◽  
Ethanol Aqueous Solution ◽  
Poly Acrylamide

Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH3+ and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2·h) for 90wt% isopropanol aqueous solution.

Development of Photoactive g-C3N4/Poly(vinyl alcohol) Composite Hydrogel Films with Antimicrobial and Antibiofilm Activity

2020 ◽  
Vol 3 (3) ◽  
pp. 1681-1689 ◽  
Author(s):  
John H. Thurston ◽  
Andrew J. Clifford ◽  
Bradley S. Henderson ◽  
Tyler R. Smith ◽  
Dylan Quintana ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Composite Hydrogel ◽  
Poly Vinyl Alcohol ◽  
Antibiofilm Activity ◽  
Hydrogel Films

Preparation and characterization of sulfonated graphene-enhanced poly (vinyl alcohol) composite hydrogel and its application as dye absorbent

Polymer ◽  
2015 ◽  
Vol 60 ◽  
pp. 96-106 ◽  
Author(s):  
Hong Li ◽  
Jinchen Fan ◽  
Zixing Shi ◽  
Min Lian ◽  
Ming Tian ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Composite Hydrogel ◽  
Poly Vinyl Alcohol ◽  
Sulfonated Graphene

scholarly journals Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

2021 ◽  
Vol 9 ◽  
Author(s):  
Wenbo Wang ◽  
Xiangyu Liu ◽  
Xue Wang ◽  
Li Zong ◽  
Yuru Kang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Vinyl Alcohol ◽  
Gel Strength ◽  
Second Order ◽  
Polymerization Reaction ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol ◽  
Order Kinetic ◽  
Pseudo Second Order

A porous semi-interpenetrating network (semi-IPN) hydrogel adsorbent with excellent adsorption properties and removal efficiency towards Pb(II) was prepared by a facile grafting polymerization reaction in aqueous medium using natural biopolymer sodium alginate (SA) as the main chains, sodium acrylate (NaA) as the monomers, and poly(vinyl alcohol) (PVA) as the semi-IPN component. FTIR, TGA and SEM analyses confirm that NaA monomers were grafted onto the macromolecular chains of SA, and PVA chains were interpenetrated and entangled with the crosslinked network. The incorporation of PVA facilitates to form pores on the surface of hydrogel adsorbent. The semi-IPN hydrogel containing 2 wt% of PVA exhibits high adsorption capacity and fast adsorption rate for Pb(II). The best adsorption capacity reaches 784.97 mg/g, and the optimal removal rate reaches 98.39% (adsorbent dosage, 2 g/L). In addition, the incorporation of PVA improved the gel strength of hydrogel, and the storage modulus of hydrogel increased by 19.4% after incorporating 2 wt% of PVA. The increase of gel strength facilitates to improve the reusability of hydrogel. After 5 times of regeneration, the adsorption capacity of SA-g-PNaA decreased by 23.2%, while the adsorption capacity of semi-IPN hydrogel only decreased by 10.8%. The adsorption kinetics of the hydrogel in the initial stage (the moment when the adsorbent contacts solution) and the second stage are fitted by segmentation. It is intriguing that the adsorption kinetics fits well with both pseudo-second-order kinetic model and pseudo-first-order model before 60 s, while only fits well with pseudo-second-order adsorption model in the whole adsorption process. The chemical complexing adsorption mainly contribute to the efficient capturing of Pb(II).

scholarly journals Facile fabrication of a magnetic self-healing poly(vinyl alcohol) composite hydrogel

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21476-21483 ◽  
Author(s):  
Mingsen Chen ◽  
Guisheng Gong ◽  
Li Zhou ◽  
Faai Zhang
Keyword(s):  
Vinyl Alcohol ◽  
Composite Hydrogel ◽  
Poly Vinyl Alcohol ◽  
Self Healing ◽  
Simple Method ◽  
Facile Fabrication

This study proposes a simple method to fabricate a magnetic self-healing poly(vinyl alcohol) (ms-PVA) composite hydrogel.

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