pH‐response superabsorbant hydrogel synthesized by ultraviolet photopolymerization

Abstract

A new synthesis method of pH-response superabsorbent hydrogels (SHG) was achieved by direct ultraviolet (UV) photopolymerization, and in particular, the synthesis of SHGs of acrylic acid (AA), sodium acrylate (AANa), and methacrylcholine chloride (MACC) tricomponent copolymer by UV photopolymerization were investigated. The pH value responsive behavior of SHG with different monomer ratios of MACC and AA was researched, and SHG showed large swelling properties at pH value approximately 7. Influences of monomer ratio (mol) of AANa to AA, photoinitiators, crosslinking agents, and exposure time of UV light on the water absorbent properties were studied. The results showed that the water absorbent capacity of SHG based on photoinitiators:Esacure KTO46 or Irgacure 651 can reach comparatively high, N,N 0 -Methylene bisacrylamide and diethylene glycol diacrylate (DEGDA) were high efficient crosslinking agents for its crosslinking the molecular chains through attending the copolymerization with monomers. When the exposure time was 10 min, the distilled water absorbency of SHG was 1503 mL/g under the condition: content of MACC, 14.3 wt %; monomer ratio (mol) of AANa to AA: 5.67; content of DEGDA and Irgacure 651, 0.0025 and 0.25 wt %.

Crosslinkers for polysaccharides and proteins: Synthesis conditions, mechanisms, and crosslinking efficiency, a review

“…The polysaccharide radicals attack AAc and MBA vinyl groups, transfering the active centers to these monomers, which can successively react to the neighbor monomers leading to crosslinking and chain propagation [167]. Unlike thermal free-radical polymerization, photopolymerization via MBA can be performed under mild conditions, at room temperature or up to 40 °C [165,[170][171][172].…”

Hydrogels for Potential Colon Drug Release by Thiol‐ene Conjugate Addition of a New Inulin Derivative

“…Hydrogels made from synthetic polymers, on the other hand, generally, do not possess these native bioactive properties, but usually they have well-defined structures that can be modified to reach the wanted degradability and functionality. The strategies employed to obtain chemically crosslinked hydrogels are numerous, from conjugation of a polymer functional group with a complementary reagent, [14] to UV induced crosslinking of acrylic functionalized polymers, [4,5,15] to addition of electron bearing moieties (such as thiol, amine or nitrile groups both bi or multifunctional), to acceptor molecules such as acrylic or vinyl sulfone groups. [16][17][18][19][20][21][22][23] In particular, the vinyl sulfone group is receiving growing attention, in organic synthesis, as a selective electron acceptor in the formation of new heteroatom/carbon bonds.…”