Aspects Regarding Radiation Crosslinking of Elastomers

Mănăilă, Elena; Stelescu, Maria Daniela; Crăciun, Gabriela

doi:10.5772/47747

Cited by 19 publications

(17 citation statements)

References 19 publications

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“…Per all, the tensile strength shows an increase in value to a maximum value which differs from the irradiation dose and the quantity of filler introduced in the mixes and after it decreases. This behaviour is consistent with reports from the scientific literature regarding tensile strength variation depending of the cross-linking degree [12][13][14]. Figure 2 shows the dependence of elongation at break depending on the amount of organic filler introduced in the mixture and irradiation dose.…”

Section: Resultssupporting

confidence: 81%

Studies on gamma irradiated rubber materials

Lungu

Stelescu

Cutrubinis

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Due to the increase in use and production of polymer materials, there is a constant pressure of finding a solution to more environmental friendly composites. Beside the constant effort of recycling used materials, it seems more appropriate to manufacture and use biodegradable and renewable row materials. Natural polymers like starch, cellulose, lignin etc are ideal for preparing biodegradable composites. Some of the dynamic markets that use polymer materials are the food and pharmaceutical industries. Because of their desinfastation and sometimes sterility requirements, different treatment processes are applied, one of it being radiation treatment. The scope of this paper is to analyze the mechanical behaviour of rubber based materials irradiated with gamma rays at four medium doses, 30.1 kGy, 60.6 kGy, 91 kGy and 121.8 kGy. The objectives are the following: to identify the optimum radiation dose in order to obtain a good mechanical behaviour and to identify the mechanical behaviour of the material when adding different quantities of natural filler (20 phr, 60 phr and 100 phr).

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Section: Resultssupporting

confidence: 81%

Studies on gamma irradiated rubber materials

Lungu

Stelescu

Cutrubinis

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Elastomers crosslinking using EB irradiation present a series of specific advantages over the traditional thermal curing, such as (1) lack of curing agents, except activators for rubber; (2) obtaining new highly pure materials (intended for medical devices, rubber items for food industry, toys for children, etc. ); (3) enabling new rubber types which cannot be crosslinked chemically or can be hardly crosslinked by usual curing procedures to be processed into finished products with major industrial applications (aircraft, army, medicine); (4) the process is very fast and can be controlled precisely, it is very clean , requires less energy , permits greater processing speed, and operates at ambient temperature ; (5) the electron beam can be steered very easily to meet the requirements of various geometrical shapes of the products to be cured; (6) the high penetrating power of radiation allows the efficient and uniform curing of thick polymeric articles; (7) the process is practically waste-free; (8) and no polymer degradation due to high temperature as EB crosslinking occurs at room temperature [ 13 – 18 ]. Because of their reliability, flexibility, low-cost, along with no environmental impact, the irradiation technologies are particularly attractive.…”

Section: Introductionmentioning

confidence: 99%

New Green Polymeric Composites Based on Hemp and Natural Rubber Processed by Electron Beam Irradiation

Stelescu

Mănăilă

Crăciun

et al. 2014

The Scientific World Journal

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A new polymeric composite based on natural rubber reinforced with hemp has been processed by electron beam irradiation and characterized by several methods. The mechanical characteristics: gel fraction, crosslink density, water uptake, swelling parameters, and FTIR of natural rubber/hemp fiber composites have been investigated as a function of the hemp content and absorbed dose. Physical and mechanical properties present a significant improvement as a result of adding hemp fibres in blends. Our experiments showed that the hemp fibers have a reinforcing effect on natural rubber similar to mineral fillers (chalk, carbon black, silica). The crosslinking rates of samples, measured using the Flory-Rehner equation, increase as a result of the amount of hemp in blends and the electron beam irradiation dose increasing. The swelling parameters of samples significantly depend on the amount of hemp in blends, because the latter have hydrophilic characteristics.

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“…CPEs vary in chlorine content (approximately 25 to 42%), molecular weight and crystallinity (Manaila et al, 2012).…”

Section: Chemistry Of Chlorinated Polyethylene and Fabrication In Promentioning

confidence: 99%

Advancements in Soft-Tissue Prosthetics Part B: The Chemistry of Imitating Life

Cruz

Ross

Powell

et al. 2020

Front. Bioeng. Biotechnol.

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Each year, congenital defects, trauma or cancer often results in considerable physical disfigurement for many people worldwide. This adversely impacts their psychological, social and economic outlook, leading to poor life experiences and negative health outcomes. In many cases of soft tissue disfigurement, highly personalized prostheses are available to restore both aesthetics and function. As discussed in part A of this review, key to the success of any soft tissue prosthetic is the fundamental properties of the materials. This determines the maximum attainable level of aesthetics, attachment mechanisms, fabrication complexity, cost, and robustness. Since the earlymid 20th century, polymers have completely replaced natural materials in prosthetics, with advances in both material properties and fabrication techniques leading to significantly improved capabilities. In part A, we discussed the history of polymers in prosthetics, their ideal properties, and the application of polymers in prostheses for the ear, nose, eye, breast and finger. We also reviewed the latest developments in advanced manufacturing and 3D printing, including different fabrication technologies and new and upcoming materials. In this review, Part B, we detail the chemistry of the most commonly used synthetic polymers in soft tissue prosthetics; silicone, acrylic resin, vinyl polymer, and polyurethane elastomer. For each polymer, we briefly discuss their history before detailing their chemistry and fabrication processes. We also discuss degradation of the polymer in the context of their application in prosthetics, including time and weathering, the impact of skin secretions, microbial growth and cleaning and disinfecting. Although advanced manufacturing promises new fabrication capabilities using exotic synthetic polymers with programmable material properties, silicones and acrylics remain the most commonly used materials in prosthetics today. As research in this field progresses, development of new variations and fabrication techniques based on these synthetic polymers will lead to even better and more robust soft tissue prosthetics, with improved lifelike aesthetics and lower cost manufacturing.

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Aspects Regarding Radiation Crosslinking of Elastomers

Cited by 19 publications

References 19 publications

Studies on gamma irradiated rubber materials

Studies on gamma irradiated rubber materials

New Green Polymeric Composites Based on Hemp and Natural Rubber Processed by Electron Beam Irradiation

Advancements in Soft-Tissue Prosthetics Part B: The Chemistry of Imitating Life

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