Polymerization of vinyl acetate in bulk and emulsion by gamma irradiation

Mesquita, A.C.; Mori, M.N.; Silva, Leonardo G Andrade e

doi:10.1016/j.radphyschem.2004.03.048

Cited by 21 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the radiation dose can be easily controlled and the experimental condition is simple . In addition, the product is free from undesirable chemical impurities such as residues from initiators for initiation and manipulation of the cross‐linking reaction in chemical cross‐linking methods . In this study, we demonstrated facile fabrication and easy control of the morphology and porosity of HPG/PEO tissue engineering scaffolds using e‐beam irradiation.…”

Section: Introductionmentioning

confidence: 98%

Hyperbranched poly(glycidol)/poly(ethylene oxide) crosslinked hydrogel for tissue engineering scaffold using e‐beams

Haryanto

Singh

Huh

et al. 2015

J Biomedical Materials Res

View full text Add to dashboard Cite

A microporous hydrogel scaffold was developed from hyperbranched poly(glycidol) (HPG) and poly(ethylene oxide) (PEO) using electron beam (e-beam) induced cross-linking for tissue engineering applications. In this study, HPG was synthesized from glycidol using trimethylol propane as a core initiator and cross-linked hydrogels were made using 0, 10, 20, and 30% HPG with respect to PEO. The effects of %-HPG on the swelling ratio, cross-linking density, mechanical properties, morphology, degradation, and cytotoxicity of the hydrogel scaffolds were then investigated. Increasing the HPG content increased the pore size of the hydrogel scaffold, as well as the porosity, elongation at break, degree of degradation and swelling ratio. In contrast, the presence of HPG decreased the cross-linking density of the hydrogel. There was no significant difference in compressive modulus and tensile strength of all compositions. The pore size of hydrogel scaffolds could be easily tailored by controlling the content of HPG in the polymer blend. Evaluation of the cytotoxicity demonstrated that HPG/PEO hydrogel scaffold has potential for use as a matrix for cellular attachment and proliferation. These results indicate that cross-linked HPG/PEO hydrogel can function as a potential material for tissue engineering scaffolds. Moreover, a facile method to prepare hydrogel microporous scaffolds for tissue engineering by e-beam irradiation was developed.

show abstract

Section: Introductionmentioning

confidence: 98%

Hyperbranched poly(glycidol)/poly(ethylene oxide) crosslinked hydrogel for tissue engineering scaffold using e‐beams

Haryanto

Singh

Huh

et al. 2015

J Biomedical Materials Res

View full text Add to dashboard Cite

show abstract

“…Some alternatives that have been investigated are soy proteins (8) and potato starch-based polyurethanes (9 Radiation-induced cross-linking is well known, and in some cases it is used to improve the properties of polymers such as polyethylene (10). Radiation can increase polymerization (11) and cross-linking (12) and cause surface aging due to oxidation or other reactions. An increase in hardness is observed after irradiation due to these alterations in the surface (13).…”

Section: Introductionmentioning

confidence: 99%

Gamma radiation effects on mechanical properties and morphology of a polyurethane derivate from castor oil

Azevedo

Chierice

Neto

et al. 2011

Radiation Effects and Defects in Solids

View full text Add to dashboard Cite

In this study, an adhesive of a polyurethane derivate from castor oil was irradiated with gamma radiation from a 60 Co source, at doses from 0.2 to 25 kGy. This adhesive polyurethane is considered for use in hospital furniture because it does not liberate dangerous solvents. Hardness and elastic modulus were measured by instrumented indentation with a pyramidal Berkovich indenter, using loads from 0.08-40 mN with a nanoindenter XP. The instrumented indentation hardness was 110 MPa for an untreated sample, increasing to 124 MPa after irradiation with 25 kGy, at penetration depths of about 5 μm. The increases in elastic modulus induced by radiation were less pronounced. This polyurethane is naturally cross-linked and the relative modifications in the hardness are attributed to an additional cross-linking process induced by radiation. X-ray diffraction indicates a slight increase in crystallinity. The roughness measured by atomic force microscopy increases after gamma irradiation.

show abstract

“…Moreover, the product can be free from impurities such as chemical residues from initiators for no catalysts or additives are needed to initiate the reaction in radiation processing. In addition, the degree of crosslinking and grafting can be controlled by the change of radiation absorbed dose (Mesquita et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Preparation of dual-sensitive graft copolymer hydrogel based on N-maleoyl-chitosan and poly(N-isopropylacrylamide) by electron beam radiation

et al. 2009

View full text Add to dashboard Cite

Organic solvent-soluble N-maleoyl-chitosan (NMCS) was synthesized by reaction of chitosan with maleic anhydride (MAH) in N,N-dimethylformamide (DMF). N-maleoyl-chitosan-graft-poly(N-isopropylacrylamide) (NMCS-g-PNIPAAm) copolymer hydrogel was prepared via free radical polymerization by electron beam (EB) irradiation. The copolymer obtained was analysed by FT-IR, XRD and thermal gravimetric analysis (TGA). It was found that the grafting yield and grafting efficiency increased with increasing radiation absorbed dose and monomer amount, and then decreased. The swelling ratio of the copolymer hydrogel was low at pH 4-5, and LCST of the hydrogel was around 32°C.

show abstract

Polymerization of vinyl acetate in bulk and emulsion by gamma irradiation

Cited by 21 publications

References 5 publications

Hyperbranched poly(glycidol)/poly(ethylene oxide) crosslinked hydrogel for tissue engineering scaffold using e‐beams

Hyperbranched poly(glycidol)/poly(ethylene oxide) crosslinked hydrogel for tissue engineering scaffold using e‐beams

Gamma radiation effects on mechanical properties and morphology of a polyurethane derivate from castor oil

Preparation of dual-sensitive graft copolymer hydrogel based on N-maleoyl-chitosan and poly(N-isopropylacrylamide) by electron beam radiation

Contact Info

Product

Resources

About