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  • Open Access

    ARTICLE

    Genipin Cross-linked Boron Doped Hydrogels: Evaluation of Biological Activities

    ELIF ANT BURSALI1,*, DILER ABACI1, MURAT KIZIL2, MURUVVET YURDAKOC1

    Journal of Polymer Materials, Vol.38, No.3-4, pp. 231-245, 2021, DOI:10.32381/JPM.2021.38.3-4.5

    Abstract Genipin cross-linked/boron doped starch/polyvinily alcohol (PVA) based hydrogel (SH-GNP-B) was synthesized as a new material having antimicrobial and antioxidant activity. The prepared hydrogel was characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analysis (TGA) and Scanning Electron Microscope (SEM) methods and evaluated for in vitro antimicrobial activities against selected organisms by disc diffusion tests. The antioxidant activity of the prepared hydrogels was evaluated using 2,2-diphenyl-1- picrylhydrazyl radical scavenging assays. Swelling behavior of the hydrogel was also investigated. The synthesized hydrogel was thermally stable and showed pH independent swelling tendency. SH-GNP-B hydrogel More >

  • Open Access

    ARTICLE

    Synthesis and characterization of polymeric responsive CMC/Pectin hydrogel films loaded with Tamarix aphylla extract as potential wound dressings

    BARKAT ALI KHAN1, FAZAL KARIM1, MUHAMMAD KHALID KHAN1,*, FAHEEM HAIDER1, SADIQULLAH KHAN2

    BIOCELL, Vol.45, No.5, pp. 1273-1285, 2021, DOI:10.32604/biocell.2021.015323 - 12 July 2021

    Abstract The fourth most predominant overwhelming type of trauma is burn injuries worldwide. Ideal wound healing dressings help in the wound healing process in a lower time with less pain. Commonly used dry wound dressing, like absorbent gauze or absorbent cotton, possess limited therapeutic effects and require repeated use, which further exaggerates patients’ suffering. In contrast, hydrogels films present a promising alternative to improve healing by guaranteeing a moisture balance at the wound site. The aim of the current study was to synthesize Tamarix aphylla (T. aphylla) extract-loaded hydrogel film with Na-CMC and pectin and to study their… More >

  • Open Access

    ARTICLE

    The Preparation and Properties of Starch Based Shape Memory Hydrogel

    Yangling Li1, Zhengrong Li1, Hui Yu1, Gang Huang1, Xiaopeng Pei2, Kun Xu2,*, Pixin Wang2, Ying Tan3,*

    Journal of Renewable Materials, Vol.9, No.8, pp. 1365-1376, 2021, DOI:10.32604/jrm.2021.014909 - 08 April 2021

    Abstract In this work, the –catechol and –thiol modified starch was prepared by the esterification and amino condensation reaction, then a fully starch based hydrogel was prepared via the thiol-catechol Michael addition reaction. The starch hydrogel gained shape memory behaviors by coordinate with Fe3+ ions at alkaline condition. 1 H-NMR had been used to character the structure of the starch derivatives and its character peaks. The hydrogel’s modulus had also been measured before and after coordinating with Fe3+ ions in linear area and the result showed that both the hydrogel’s storage modulus and loss modulus kept constant in More >

  • Open Access

    ARTICLE

    Preparation and Properties of Polyacrylamide/Sodium Alginate Hydrogel and the Effect of Fe3+ Adsorption on Its Mechanical Performance

    Zheng Cao1,2,3,4,*, Yang Zhang2, Keming Luo2, Yinqiu Wu2, Hongxin Gao2, Junfeng Cheng2,*, Chunlin Liu2,3, Guoliang Tao2, Qingbao Guan1, Lei Zhang5

    Journal of Renewable Materials, Vol.9, No.8, pp. 1447-1462, 2021, DOI:10.32604/jrm.2021.015593 - 08 April 2021

    Abstract

    The preparation and application of functional hydrogels based on natural polysaccharides have always been a hot research topic. In this study, using acrylamide (AM) monomer, N, N'-methylene bisacrylamide (MBA) as cross-linking agent, potassium persulfate (K2S2O8) as initiator, in the presence of natural polysaccharide sodium alginate (SA), the PAM/SA hydrogel was prepared by free radical polymerization. Fourier transform infrared spectroscopy (FT-IR), swelling performance tests, scanning electron microscope (SEM), thermogravimetric analysis (TGA), UV-visible spectrophotometer, mechanical property measurements were carried out to analyze the composition, morphology, and performance of the hydrogels. The swelling behavior, dye adsorption performance, and the

    More >

  • Open Access

    ARTICLE

    Swelling dynamics of Poly (N, N- Dimethylacrylamide - co- Crotonic acid) Hydrogel and Evaluation of its Potential for Controlled Release of Fertilizers

    FATMA LOUZRI, SADJIA BENNOUR

    Journal of Polymer Materials, Vol.37, No.1-2, pp. 55-76, 2020, DOI:10.32381/JPM.2020.37.1-2.5

    Abstract Poly(N,N-dimethymethylacrylamide -co-crotonic acid) (P(DMA-CAx)) hydrogels were prepared by free radical polymerization, using N,N- methylenebisacrylamide (NMBA) as cross-linking agent. The synthesized hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The effects of comonomer composition and pH of the medium on the swelling behavior of hydrogels were investigated. The obtained results showed that the swelling capabilities of hydrogels increased as crotonic acid content and pH increased. In order to evaluate the controlled release potential of the polymeric matrix, it was loaded with potassium nitrate and ammonium nitrate as fertilizers and the release More >

  • Open Access

    ARTICLE

    Improving the Antibacterial Property of Chitosan Hydrogel Wound Dressing with Licorice Polysaccharide

    Haiwei Ren1, Li Wang1, Hui Bao1, Yunya Xia1, Dada Xu1, Weijie Zhang1,*, Zhiye Wang2

    Journal of Renewable Materials, Vol.8, No.10, pp. 1343-1355, 2020, DOI:10.32604/jrm.2020.010903 - 31 August 2020

    Abstract A series of hydrogels with different ratios of chitosan and licorice polysaccharide (LP) were prepared by crosslinking to different concentrations of genipin (gp). They were characterized by FTIR (Fourier transform infrared spectroscopy), SEM (Scanning electron microscope), swelling ratio, rheological measurements, degradation with time, cytotoxicity, and antibacterial efficacy. Results show that the hydrogels have porous structures. With an increase in LP content, the swelling rate grows in the early stage of immersion in buffer and drops later. The swelling ratio ranged from 986% to 1677%, and stiffness varied from 777 Pa to 1792 Pa. The addition… More >

  • Open Access

    ARTICLE

    The Influence of Entanglements of Net Chains on Phase Transition Temperature of Sensitive Hydrogels in Chemo-Mechanical Coupled Fields

    Tao Li1, Qingsheng Yang1, *, Lianhua Ma2, Xiaojun Zhang2, *

    CMES-Computer Modeling in Engineering & Sciences, Vol.123, No.3, pp. 995-1014, 2020, DOI:10.32604/cmes.2020.09152 - 28 May 2020

    Abstract Phase transition of hydrogel, which is polymerized by polymer network, can be regarded as the transition of polymer network stability. The stability of the polymer network might be changed when the external environment changed. This change will lead to the transformation of sensitive hydrogels stability, thus phase transition of hydrogel take place. Here, we present a new free density energy function, which considers the non-gaussianity of the polymer network, chains entanglement and functionality of junctions through adding Gent hyplastic model and Edwards-Vilgis slip-link model to Flory-Huggins theory. A program to calculate the phase transition temperature More >

  • Open Access

    ARTICLE

    Poly (vinyl alcohol)/Graphene Nanocomposite Hydrogel Scaffolds for Control of Cell Adhesion

    Xiaodong Wang1,2, Meng Su2, Chuntai Liu2, Changyu Shen2, Xianhu Liu2,*

    Journal of Renewable Materials, Vol.8, No.1, pp. 89-99, 2020, DOI:10.32604/jrm.2020.08493 - 01 January 2020

    Abstract Poly (vinyl alcohol) (PVA)/reduced graphene oxide (rGO) nanocomposites is prepared by the immersion of PVA/graphene oxide (GO) nanocomposites in the reducing agent aqueous solution. The PVA/graphene nanocomposites can be used as scaffold after treatment by chemical crosslinking agents. The surface hydrophilicity of the nanocomposite scaffolds decreased with the addition of GO or rGO by measuring the contact angles of scaffolds. The electrical conductivity of PVA/rGO nanocomposite scaffold increased with rGO content increased. The highest conductivity of PVA/rGO nanocomposite scaffolds with 10 wt% rGO could reach to 12.16 × 10−3 S/m. The NIH-3T3 fibroblasts attach and grow More >

  • Open Access

    ARTICLE

    Functionalized 2-(hydroxyethyl) methacrylate (HEMA)- co-acrylamide (AAm) hydrogels: Kinetic and Isotherm Modelling Analysis on the Removal of Cu(II) Ions

    AYÇA BAL ÖZTÜRK1,2,*, ZEHRA ÖZBAŞ3, BENGİ ÖZKAHRAMAN4, SERKAN EMİK5

    Journal of Polymer Materials, Vol.36, No.2, pp. 161-173, 2019, DOI:10.32381/JPM.2019.36.02.5

    Abstract A functionalized hydrogel composed of 2-(hydroxyethyl) methacrylate (HEMA) and acrylamide (AAm) was synthesized by amination and saponification reactions, respectively, and its functionality was examined for the elimination of copper(II) ions. The maximum adsorption capacity for copper(II) ions was 0.617 mmol g-1 before saponification, whereas it was 1.2225 mmol g-1 after saponification. The adsorption data was analyzed with pseudo-first-order (r2 =0.8867), intra-particle diffusion (r2 =0.9453), Elovich (r2=0.9489) and pseudo-secondorder(r2 =0.9999) kinetic models. Based on the adsorption equilibrium experimental data Freundlich(r2 =0.9964), Langmuir(r2=0.998) and Dubinin–Radushkevich (D-R) (r2 =0.9960) adsorption isotherms provided good fits for all of experimental results. Finally, the datas of More >

  • Open Access

    ARTICLE

    Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

    Malika Talantikite1,*, Antoine Gourlay1, Sophie Le Gall1, Bernard Cathala1

    Journal of Renewable Materials, Vol.7, No.12, pp. 1381-1390, 2019, DOI:10.32604/jrm.2019.07838

    Abstract Plant components are an inexhaustible source for the construction of bio-based materials. Here we report, for the first time, the elaboration of biobased cellulose nanocrystals (CNC)/xyloglucan (XG) hydrogels. XG is a hemicellulose displaying a great affinity for cellulose surface and can be thus irreversibly adsorbed on CNC. Properties of the hydrogels were investigated by varying the molar mass of XG either by enzymatic treatment with Endoglucanase (EG2) or physical fractionation by ultrasound (US). Fractions were characterised by high-performance size exclusion chromatography (HPSEC) and their monosacchari decompositions were determined. Three fractions with high, average and small… More >

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