Abstract Novel pH‐sensitive hydrogels based on chitosan, itaconic acid and methacrylic were prepared in two steps. Chitosan was first ionically crosslinked with acid, after which a free radical polymerization crosslinking of the chitosan/itaconic network performed by adding crosslinker order to achieve better mechanical properties tunable swelling. The samples characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, X‐ray...

Abstract Chitosan is a biodegradable, non‐toxic, biocompatible polymer convenient for use in drug delivery. In this study, hybrid polymeric networks (HPNs) based on chitosan, itaconic acid and poly(vinyl alcohol) (PVA) were prepared characterized. was dissolved order to obtain ionic crosslinking with the dicarboxylic acid. second step, chitosan/itaconic network mixed PVA chemically crosslinked glutaraldehyde. The ratio kept constant, while concentrations of glutaraldehyde varied. All samples...

Supercritical carbon dioxide (scCO 2 ) technology was used for preparation of functional pH sensitive chitosan‐based aerogels characterized with micron size pores and their impregnation thymol as a natural bioactive substance. Hydrogels based on chitosan, itaconic methacrylic acids were transformed to alcogels dried in the air or scCO obtain xero‐ aerogels, respectively. Applying 10 min static 120 dynamic drying at 11 MPa 45°C followed decompression rate 1 MPa/min yielded an advantageous...

The application of poly(acrylamide‐ co ‐sodium methacrylate) hydrogel for the removal Cu 2+ and Cd ions from aqueous solutions has been investigated as a function pH, adsorbent dose temperature. FTIR spectra showed that –NH 2 –COOH groups are involved in both metal adsorption which followed pseudo‐first order kinetics. Non‐linear regression analysis six isotherms, Langmuir, Freundlich, Redlich‐Peterson, Toth, Dubinin‐Radushkevich Sips, have applied to sorption data, while best interpretation...

This study reports the synthesis of polymeric matrices based on N-isopropylacrylamide and itaconic acid its application for immobilization lipase from Candida rugosa. The was immobilized by entrapment method. Free activities, pH temperature optima, storage stability were investigated. optimum free entrapped found to be 40 45 °C, while observed at 7 8, respectively. Both hydrolytic activity in an aqueous medium esterolytic organic have been evaluated. Maximum reaction rate (V max)...

An interpenetrating polymer network (IPN) based on the sodium alginate (A) and partially neutralized poly(methacrylic acid) (MAA) was prepared by free radical polymerization followed additional cross‐linking of with calcium ions. Obtained material (A/MAA IPN) characterized FTIR spectroscopy, thermogravimetric analysis, scanning electron microscopy, rheological measurements. Swelling behavior synthetized IPN has been also investigated. TiO 2 nanoparticles (TiO NPs) were immobilized onto A/MAA...

Stimuli responsive pH- and temperature-sensitive hydrogel drug delivery systems, as those based on N-isopropylacrylamide (NiPAAm) itaconic acid (IA), have been attracting much of the attention scientific community nowadays, especially in field release. By adjusting comonomer composition, matrix is enabled to protect incorporated protein highly acidic environment upper gastrointestinal tract deliver it neutral or slightly basic region lower intestine. The protein/poly(NiPAAm-co-IA) hydrogels...

With the excessive risks that are present in today's environment, it is of great importance to treat wastewaters before their discharge water streams. One everyday challenges design a low-cost and environmentally friendly sorbent such as hydrogel based on chitosan, itaconic methacrylic acid can remove wide range textile dyes. In study, this has been utilized for investigation removal three different azo dyes from simulated wastewater: C.I. Basic Blue 9, Red 1 Acid Orange 7. It was found pH...

This paper deals with synthesis of copolymer hydrogels N-isopropilacrylamide, itaconic acid and chitosan. During synthesis, pH the reaction solution temperature were varied. It was found that at higher temperature, above lower critical (LCST) value N-isopropilacrylamide resulted in a formation polymer rich domains or aggregates matrix loosely tied network, which cause degree swelling. Moreover, also affects swelling contraction owing to different ionization ionic groups presence hydrogel....

Chitosan is a natural polycationic polymer that possesses useful properties such as bioactivity, biocompatibility, non-toxicity and non-antigenicity. On the other hand, its mechanical are not good for some biomedical application. They may be improved by preparing semi-interpenetrating networks (semi-IPNs), when hydrogel network prepared in presence of previously made poly(ethylene glycol). This paper deals with synthesis characterization chitosan glycol) different Ch/PEG ratio crosslinking...

In this paper the results of comparative thermal analysis TG-DTG-DTA-DSC for decomposition process [Cr(NH3)6]Cl3 in air atmosphere are given. The kinetics and mechanism complex decomposition, enthalpy as changes specific capacity solid products reaction with temperature were determined.

A semi-interpenetrating networks (semi-IPNs) based on chitosan and poly(N-vinyl-2-pyrrolidone) were prepared in order to achieve better mechanical properties. The samples characterized by FTIR, SEM, DMA analysis the swelling behavior at different pHs (2.0-8.0). semi-IPNs composition was found have a great impact hydrogel structure, properties, morphology kinetics. gels demonstrated substantial change buffer absorbency with of pH, high for acid buffers lower pH values above 6 where...