Preparation of Natural Rubber/Condensed Tannin Semi-interpenetrating Polymer Network Composites by Hematin-Catalyzed Cross-Linking

2010 ◽  
Vol 19 (1) ◽  
pp. 100-105 ◽  
Author(s):  
Jun-ichi Kadokawa ◽  
Kazuhei Kodzuru ◽  
Satoshi Kawazoe ◽  
Tomoaki Matsuo
Keyword(s):  
Natural Rubber ◽  
Condensed Tannin ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Cross Linking

Synthesis and characterization of a novel wound dressing by PVP/ PAANa/chitosan with semi-interpenetrating polymer network structure

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Ying Wu ◽  
Qing Yang ◽  
Yali Gi ◽  
Yueting Zhang
Keyword(s):  
Network Structure ◽  
Wound Dressing ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Wound Dressings ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Mass Ratio ◽  
Scanning Electron

AbstractA novel hydrogel wound dressing with semi-interpenetrating polymer network structure (semi-IPN) was prepared by radical polymerization of acrylic acid with potassium persulfate (K2S2O8) as initiator and N, N'-methylenebisacrylamide (MBA) as cross-linking agent in the presence of chitosan (CTS) and polyvinyl pyrrolidone (PVP). Hydrogels were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). SEM displayed semi- IPN hydrogels' creased surface with some scale-like wrinkles, thus improving the absorptive capability which has been considered as a most important characteristic of wound dressings. It was found that the content of cross-linking agent and the mass ratio of PVP and CTS had much influence on the mechanical properties of the hydrogel, varying from brittle plastics to elastomer due to the different degrees of cross linking. Since tensile strength is partly in inverse ratio to the hydrogel absorbent capability, the article offers an analysis of varying material proportion in order to obtain an optimum properties of the hydrogel wound dressing .

scholarly journals Interpenetrating Polymer Network Hydrogels Based on Gelatin and PVA by Biocompatible Approaches: Synthesis and Characterization

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Eltjani-Eltahir Hago ◽  
Xinsong Li
Keyword(s):  
Mechanical Properties ◽  
Mtt Assay ◽  
Biomedical Applications ◽  
Polymer Network ◽  
Physical And Mechanical Properties ◽  
Morphological Characterization ◽  
Interpenetrating Polymer Network ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
New Approach

In this work, a new approach was introduced to prepare interpenetrating polymer network PVA/GE hydrogels by cross-linking of various concentration gelatin in the presence of transglutaminase enzyme by using the freezing-thawing cycles technique. The effects of freezing-thawing cycles on the properties of morphological characterization, gel fraction, swelling, mechanical, and MTT assay were investigated. The IPN PVA/GE hydrogels showed excellent physical and mechanical Properties. MTT assay data and the fibroblasts culture also showed excellent biocompatibility and good proliferation. This indicates that the IPN hydrogels are stable enough for various biomedical applications.

scholarly journals Preparation and Characterizations of Zeolite – Filled Natural Rubber/Poly(vinyl alcohol) Semi–IPN Membranes

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
J. Patthana ◽  
C. Poonsawat ◽  
S. Amnuaypanich
Keyword(s):  
Natural Rubber ◽  
Vinyl Alcohol ◽  
Polymer Network ◽  
Water Concentration ◽  
Liquid Mixtures ◽  
Sem Analysis ◽  
Interpenetrating Polymer Network ◽  
Poly Vinyl Alcohol ◽  
Zeolite Content ◽  
Sulfosuccinic Acid

Semi–interpenetrating polymer network (semi–IPN) of natural rubber (NR) and crosslinked poly(vinyl alcohol) (PVA) was composited with zeolite 4A to form a mixed matrix (MM) membrane. PVA was crosslinked with sulfosuccinic acid (SSA) in the immediate presence of NR and zeolite. FT–IR spectroscopy confirmed the crosslinking of PVA in the MM membrane. Swelling measurements were carried out in both water and absolute ethanol. The degrees of swelling in both water and ethanol increased with increasing PVA content in the membranes, however they were found to decline upon increasing zeolite content more than 10 %w/w. The mechanical properties of the MM membranes were investigated by tensile testing. It was observed that the modulus increased with increasing zeolite content in membranes but the elongation at break was found to decrease. The thermal degradation of the MM membranes was studies using thermal gravimetry (TG). The MM membranes showed higher thermal stability compared with NR/PVA membrane due to the incorporation of zeolite. The dispersion of zeolite particles in the MM membrane was observed by scanning electron microscopy (SEM) analysis which showed a well dispersing of zeolite particles in the semi–IPN matrix. The sorption selectivities of MM membranes were enhanced with zeolite content especially, at low water concentration of ethanol–water mixtures. However the sorption selectivities of MM membranes decreased when water content in the liquid mixtures increased.

Synthesis and properties of biodegradable hydrogels based on cross-linked natural rubber and cassava starch

2016 ◽  
Vol 49 (7) ◽  
pp. 574-594 ◽  
Author(s):  
Chaiwute Vudjung ◽  
Sayant Saengsuwan
Keyword(s):  
Natural Rubber ◽  
Polymer Network ◽  
Fertilizer Application ◽  
Cassava Starch ◽  
Interpenetrating Polymer Network ◽  
X Ray Diffraction ◽  
Gel Fraction ◽  
Link Density ◽  
Cross Link Density ◽  
Water Swelling

A series of interpenetrating polymer network (IPN) hydrogels based on cross-linked natural rubber (XNR) and cassava starch (CSt) as biodegradable membrane material were synthesized via free radical polymerization in latex state using N, N′-methylene bisacrylamide (MBA) and maleic acid as cross-linkers. The IPN XNR/CSt hydrogels were confirmed and characterized by infrared spectroscopy, thermal analysis, and X-ray diffraction. The results showed that with increasing MBA content from 1.0 to 2.5 phr, cross-link density and gel fraction of XNR increased from 0.80 to 0.90 mol M−3 and from 19.7% to 30.5%, respectively. The gel fraction and tensile strength of the IPN XNR/CSt hydrogels also gradually increased as a function of MBA content but the water swelling and elongation at break decreased slightly. The IPN XNR/CSt containing 1.0 phr MBA displayed the highest water swelling of 82%. The weight retentions of IPN XNR/CSt hydrogels after soil degradations for 90 days increased from 48% to 56% with increasing MBA from 1.0 phr to 2.5 phr. The IPN XNR/CSt exhibited not only a good biodegradation but also high mechanical strength and flexibility. Also, the IPN XNR/CSt could be a promising candidate as a biodegradable membrane for longer released fertilizer application.

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