Photopolymerization and structure formation of methacrylic acid based hydrogels in water/ethanol mixture

He, Hongyan; Li, Ling; Lee, L. James

doi:10.1016/j.polymer.2006.01.014

Cited by 24 publications

(14 citation statements)

References 24 publications

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“…At higher pH (7.4; SIF), the carboxyl groups are deprotonated, and a higher swelling ratio is conferred due to the collective electrostatic repulsion forces between the ionized acid groups. A similar pH-dependent swelling behavior has been observed in polymers containing pendant carboxylic acid groups such as alginate (Mohamadnia, Zohuriaan-Mehr, Kabiri, Jamshidi, & Mobedi, 2007), poly(acrylic acid) (Li, Wu, Wang, & Duan, 2006), and poly(methacrylic acid) (He, Li, & Lee, 2006).…”

Section: Swelling Of Modified Kappa-carrageenansupporting

confidence: 69%

Carboxymethylation of kappa-carrageenan for intestinal-targeted delivery of bioactive macromolecules

Leong

Chung

Noordin

et al. 2011

Carbohydrate Polymers

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Section: Swelling Of Modified Kappa-carrageenansupporting

confidence: 69%

Carboxymethylation of kappa-carrageenan for intestinal-targeted delivery of bioactive macromolecules

Leong

Chung

Noordin

et al. 2011

Carbohydrate Polymers

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“…Scanning electronic microscopy (SEM) technique is useful to reveal hydrogel structure [22]. As shown in Fig.…”

Section: Scanning Electronic Microscopy Studymentioning

confidence: 99%

Preparation and properties of new non-loading and superhigh ammonium nitrate loading hydrogels

Wang

Zhu

2007

Reactive and Functional Polymers

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“…Hydrogels have been widely synthesized by radical polymerization using UV photopolymerization or by redox polymerization . Photopolymerization is favored because hydrogels can be synthesized at temperatures and pH conditions near physiological conditions and even in the presence of biologically active materials . Furthermore, photopolymerization can be easily controlled by adjusting the dosage and intensity of UV light, and the curing temperature …”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of physically crosslinked N‐vinylcaprolactam, acrylic acid, methacrylic acid, and N,N‐dimethylacrylamide hydrogels

Gaballa

Geever

Killion

et al. 2013

J Polym Sci B Polym Phys

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Physically crosslinked hydrogels based on N‐vinylcaprolactam/acrylic acid and N‐vinylcaprolactam/methacrylic acid were prepared via free radical polymerization. These temperature responsive hydrogels were characterized in terms of glass transition, phase separation temperature, potentiometric titration and swelling properties. Results showed that phase transition temperature was dependent on the pH value of the solution; increasing pH led to higher lower critical solution temperature (LCST) values which was related to the dissociative behaviors of the carboxylic group of MAc in the buffered solutions. Additionally, with the incorporation of N,N‐dimethylacrylamide into the system, cloud point measurements and MDSC showed an increased in the LCST. This increase was based on hydrophilicity, the hydrophilic–hydrophobic balance was disturbed, and consequently, the LCST behavior was shifted. The pKa of the copolymers ranged between 5.6 and 6.5, while for the terpolymers pKa ranged between 5.3 and 6. At high pH (>10), the COOH group is deprotonated and negatively charged (COO−), while at low pH (1–3) the carboxylic group remains protonated which results in hydrogen bonding between the hydroxyl groups (from NaOH) and the excess of HCl. These results correlate with swelling studies where above the pKa value the hydrogels dissolved rapidly compared to below pKa they did not dissolve at all. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 1555–1564

show abstract

Photopolymerization and structure formation of methacrylic acid based hydrogels in water/ethanol mixture

Cited by 24 publications

References 24 publications

Carboxymethylation of kappa-carrageenan for intestinal-targeted delivery of bioactive macromolecules

Carboxymethylation of kappa-carrageenan for intestinal-targeted delivery of bioactive macromolecules

Preparation and properties of new non-loading and superhigh ammonium nitrate loading hydrogels

Synthesis and characterization of physically crosslinked N‐vinylcaprolactam, acrylic acid, methacrylic acid, and N,N‐dimethylacrylamide hydrogels

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