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Sanad MH, Marzook FA, Ibrahim IT, Abd-Elhalim SM, Farrag NS. Preparation and Bioevaluation of Radioiodinated Omberacetam as a Radiotracer for Brain Imaging. RADIOCHEMISTRY 2023; 65:114-121. [DOI: 10.1134/s1066362223010162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/04/2023] [Accepted: 03/06/2023] [Indexed: 09/02/2023]
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2
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Katbab P, Asghari N, Katbab AA, Jafari SH. Effects of blend phase ratio upon thermomechanical, viscoelastic relaxation and strain recovery behavior of crosslinked LDPE/EVA foams. JOURNAL OF POLYMER RESEARCH 2023. [DOI: 10.1007/s10965-022-03400-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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3
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Qewami S, Rasoul Mousavi S, Ghanemi R, Mohammadi-Roshandeh J, Ali Khonakdar H, Hemmati F. An insight into simultaneous phase transition phenomena and melt-rheology of low-density polyethylene/ethylene-vinyl acetate copolymer/expanded graphite nanocomposites through continuous extrusion foaming process. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Sanad MH, Eyssa HM, Marzook FA, Farag AB. Preparation and Bioevaluation of [99mTc]Tricarbonyl Omeprazole for Gastric Ulcer Localization in Mice. RADIOCHEMISTRY 2022. [DOI: 10.1134/s106636222201009x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sanad M, Farag A, Bassem SA, Marzook F. Radioiodination of zearalenone and determination of Lactobacillus plantarum effect of on zearalenone organ distribution: In silico study and preclinical evaluation. Toxicol Rep 2022; 9:470-479. [PMID: 35345860 PMCID: PMC8956894 DOI: 10.1016/j.toxrep.2022.02.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 01/21/2022] [Accepted: 02/06/2022] [Indexed: 10/26/2022] Open
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Sanad MH, Marzook FA, Farag AB, Mandal SK, Rizvi SFA, Gupta JK. Preparation, biological evaluation and radiolabeling of [99mTc]-technetium tricarbonyl procainamide as a tracer for heart imaging in mice. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2021-1079] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Abstract
This study focuses on the synthesis and preliminary bio-evaluation of [99mTc]-technetium tricarbonyl procainamide ([99mTc]-technetium tricarbony PA) as a viable cardiac imaging agent. The compound, [99mTc]-technetium tricarbony PA, was synthesized by labelling procainamide with a [99mTc]-technetium tricarbonyl core, yielding a high radiochemical yield and radiochemical purity of 98%. Under optimal circumstances, high radiochemical yield and purity were obtained utilizing [99mTc]-technetium tricarbonyl core within 30 min of incubation at pH 9, 200 µg substrate concentration, and 100 °C reaction temperature. The heart showed a high absorption of 32.39 ± 0.88% of the injected dose/g organ (ID/g), confirming the suitability of [99mTc]-technetium tricarbonyl PA as a viable complex for heart imaging.
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Affiliation(s)
- M. H. Sanad
- Labeled Compounds Department , Hot Laboratories Center, Egyptian Atomic Energy Authority , P.O. Box 13759 , Cairo , Egypt
| | - Fawzy A. Marzook
- Labeled Compounds Department , Hot Laboratories Center, Egyptian Atomic Energy Authority , P.O. Box 13759 , Cairo , Egypt
| | - Ayman B. Farag
- Pharmaceutical Chemistry Department , Faculty of Pharmacy, Ahram Canadian University , Giza , Egypt
| | - Sudip Kumar Mandal
- Department of Pharmaceutical Chemistry , Dr. B. C. Roy College of Pharmacy and Allied Health Sciences , Durgapur 713206 , West Bengal , India
| | - Syed F. A. Rizvi
- College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , Gansu , P. R. China
| | - Jeetendra Kumar Gupta
- Institute of Pharmaceutical Research , GLA University Mathura , Uttar Pradesh , India
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Eyssa HM, El Refay HM, Sanad MH. Enhancement of the thermal and physicochemical properties of styrene butadiene rubber composite foam using nanoparticle fillers and electron beam radiation. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2021-1091] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Abstract
This study investigates the physicochemical and thermal properties of styrene–butadiene rubber (SBR) nanocomposite foam. Nano-calcium carbonate (CaCO3) was prepared from eggshells (ESs) waste. Sponge rubber nanocomposites were prepared and were irradiated by electron beam (EB) radiation at 25, 75, and 150 kGy. Their physicochemical properties, including foam density, compression set (CS), hardness, abrasion loss, and expansion ratio, and their thermal stability were investigated. The physicochemical properties were enhanced by adding 2.5 phr of a foaming agent. Among the composites examined, the foam composites containing nano-CaCO3 had the lowest CS, abrasion loss, and expansion ratio and the highest hardness and foam density. The results confirmed that the thermal stability was improved by incorporating nano-CaCO3 into the SBR foam and as the radiation dose increased. The sponge containing nanoclay demonstrated an intermediate behavior, whereas that with CaCO3 nanoparticles showed low average cell diameter and size and high cell wall thickness. The radiation process enhanced the foam density, CS, abrasion loss, hardness, and thermal property of the developed nanocomposites by inducing the formation of intermolecular crosslinks within the composite matrix. The results showed that physicochemical properties improved by increasing the radiation dose at 25 kGy.
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Affiliation(s)
- H. M. Eyssa
- Radiation Chemistry Department , National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority , P. O. Box 29 , Cairo , Egypt
| | - Heba. M. El Refay
- Chemistry Department , Faculty of Science (Girls), Al Azhar University , P.O. Box: 11754 , Cairo , Egypt
| | - M. H. Sanad
- Labeled Compounds Department, Hot Labs Center , Egyptian Atomic Energy Authority , P.O. Box 13759 , Cairo , Egypt
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Sanad MH, Eyssa HM, Marzook FA, Rizvi SFA, Farag AB, Fouzy ASM, Bassem SA, Ibrahim AA. Synthesis, Radiolabeling, and Biological Evaluation of 99mTc-Tricarbonyl Mesalamine as a Potential Ulcerative Colitis Imaging Agent. RADIOCHEMISTRY 2022. [DOI: 10.1134/s1066362221060163] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Sanad MH, Eyssa HM, Marzook FA, Farag AB, Rizvi SFA, Mandal SK, Patnaik SS, Fouzy ASM. Optimized Chromatographic Separation and Bioevalution of Radioiodinated Ilaprazole as a New Labeled Compound for Peptic Ulcer Localization in Mice. RADIOCHEMISTRY 2022. [DOI: 10.1134/s1066362221060138] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Sanad MH, Gomaa NM, El Bakary NM, Ibrahim IT, Massoud A. Radioiodination of balsalazide, bioevaluation, and characterization as a highly selective radiotracer for imaging of ulcerative colitis in mice. J Labelled Comp Radiopharm 2022; 65:71-82. [PMID: 34984721 DOI: 10.1002/jlcr.3961] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 12/26/2021] [Accepted: 12/27/2021] [Indexed: 01/01/2023]
Abstract
This work focuses on tracking ulcerative colitis in mice. High labeling yield and radiochemical purity were achieved for the formation of a [125/131 I]balsalazide radiotracer at optimum conditions of oxidizing agent content (chloramines-T [Ch-T], 75 μg), substrate amount (100 μg), pH of reaction mixture (6), reaction time (30 min), and temperature (37°C), using radioactive iodine-125 (200-450 MBq). The radiolabeled compound, [125/131 I]balsalazide, was stable in serum and saline solution during 24 h. Balsalazide is acting as a peroxisome proliferator-activated receptor (PPARγ). Biodistribution studies were carried in normal and ulcerated colon mice. High uptake of 75 ± 1.90% injected dose/g organ (ID/g) observed in ulcerated mice confirmed the suitability of [131 I]balsalazide as a novel radiotracer for ulcerative colitis imaging in mice.
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Affiliation(s)
- M H Sanad
- Labeled Compounds Department, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt.,Department of Physics and Engineering Mathematics, Faculty of Engineering, Ain Shams University, Cairo, Egypt
| | - Nermien M Gomaa
- Radiation Microbiology Department/Biotechnology/National Center for Research and Radiation Technology, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Nermeen M El Bakary
- Radiation Biology Department, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Ismail T Ibrahim
- Labeled Compounds Department, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Ayman Massoud
- Nuclear Chemistry Department, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
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11
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Katbab P, Jafari SH, Katbab AA, Kontopoulou M. Role of blend phase ratio in controlling morphology, compressive, and recovery behavior of low‐density polyethylene/ethylene‐vinyl acetate foams. J Appl Polym Sci 2021. [DOI: 10.1002/app.52105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Pouya Katbab
- Polymer Engineering Group, Kish International Campus University of Tehran Kish Island Iran
| | - Seyed Hassan Jafari
- School of Chemical Engineering, College of Engineering University of Tehran Tehran Iran
| | - Ali Asghar Katbab
- Department of Polymer and Color Engineering Amirkabir University of Technology (Tehran Polytechnic) Tehran Iran
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12
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Morones PG, Cabrera Álvarez EN, Nieves IS, Neira Velázquez MG, Hernández EH, Sánchez Martínez DI, Florido HAF, Gordillo CC, Rivera JG, Gámez JFH. Graphite effect on the mechanical and fire‐retardant performance of low‐density polyethylene and ethylene‐vinyl‐acetate foam composites. J Appl Polym Sci 2021. [DOI: 10.1002/app.50892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pablo González Morones
- Departamento de Materiales Avanzados Centro de Investigación en Química Aplicada Saltillo Mexico
| | - Edgar Nazareo Cabrera Álvarez
- Departamento de Procesos de Transformación CONACYT, Centro de Investigación en Química Aplicada unidad Monterrey Apodaca Mexico
| | - Israel Sifuentes Nieves
- Departamento de Materiales Avanzados Centro de Investigación en Química Aplicada Saltillo Mexico
| | | | | | | | - Heidi Andrea Fonseca Florido
- Departamento de Procesos de Transformación CONACYT, Centro de Investigación en Química Aplicada unidad Monterrey Apodaca Mexico
| | | | - Javier Gudiño Rivera
- Departamento de Procesos de Transformación Centro de Investigación en Química Aplicada Saltillo Mexico
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Pham NTH. Characterization of Low-Density Polyethylene and LDPE-Based/Ethylene-Vinyl Acetate with Medium Content of Vinyl Acetate. Polymers (Basel) 2021; 13:polym13142352. [PMID: 34301109 PMCID: PMC8309532 DOI: 10.3390/polym13142352] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/05/2021] [Accepted: 07/13/2021] [Indexed: 11/17/2022] Open
Abstract
Low-density polyethylene (LDPE) and ethylene vinyl acetate copolymer (EVA), which are non-polar and polar polymers, are immiscible and form a polyphase system. In this study, LDPE was mixed with 2.5%, 5%, 7.5%, 10%, 12.5% Ethylene-vinyl acetate (EVA-28) with a medium content of vinyl acetate (28% VA), respectively by injection molding machine and LDPE. Tensile strength and flexural strength were tested according to ASTM D638-02 standard and ISO 178 standard. The results showed that adding EVA-28 increased the elongation at break of the LDPE/2.5% EVA, LDPE/5% EVA and LDPE/10% EVA blend samples. In addition, the tensile and flexural strength of the LDPE/EVA blend decreases gradually as the EVA-28 content in the blend increases. The hardness decreases with the increasing EVA-28 content. EVA-28 spherical particles appeared scattered on the surface of the LDPE matrix, in the highest EVA-28 percent sample (12.5% EVA-28), the number of particles appeared to be quite a lot, and was dispersed quite evenly on the surface. The LDPE/EVA-28 blend achieved a higher elongation at the break than LDPE, in which 10% EVA-28 gives the highest elongation at break.
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Affiliation(s)
- Nga Thi-Hong Pham
- Faculty of Mechanical Engineering, HCMC University of Technology and Education, Ho Chi Minh City 71307, Vietnam
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Salmazo LO, Lopéz-Gil A, Ariff ZM, Rodriguez-Mendez ML, Job AE, Rodriguez-Perez MA. Study of the Foaming Kinetics in Epoxidized Natural Rubber Foams Crosslinked by Electron Beam Irradiation. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800295] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Leandra Oliveira Salmazo
- Cellular Materials Laboratory; Condensed Matter Physics Department; University of Valladolid; Paseo de Belén 7 47011 Valladolid Spain
| | - Alberto Lopéz-Gil
- CellMat Technologies S.L.; Paseo de Belén 9-A 47011 Valladolid Spain
| | - Zulkifli Mohamad Ariff
- School of Materials and Mineral Resources Engineering; Engineering Campus; Universiti Sains Malaysia; 14300 Nibong Tebal Pulau Pinang Malaysia
| | - Maria Luz Rodriguez-Mendez
- Group UVaSens; Department of Inorganic Chemistry; Escuela de Ingenierías Industriales; Universidad de Valladolid; CP: 47011 Valladolid Spain
| | - Aldo Eloizo Job
- Faculdade de Ciências e Tecnologia; Universidade Estadual Paulista; Rua Roberto Simonsen, 305, CEP 19060-900, Presidente Prudente São Paulo Brazil
| | - Miguel Angel Rodriguez-Perez
- Cellular Materials Laboratory; Condensed Matter Physics Department; University of Valladolid; Paseo de Belén 7 47011 Valladolid Spain
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Lopez-Gonzalez E, Salmazo LO, Lopez-Gil A, Laguna-Gutierrez E, Rodriguez-Perez MA. Analysis of the foaming mechanisms of materials based on high-density polyethylene (HDPE) crosslinked with different irradiation doses. J Appl Polym Sci 2018. [DOI: 10.1002/app.46276] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Eduardo Lopez-Gonzalez
- Condensed Matter Physics Department, Cellular Materials Laboratory (CellMat); University of Valladolid; Paseo Belén 7, Valladolid 47011 Spain
- CellMat Technologies S.L., Paseo de Belen 9-A (CTTA Building); Valladolid 47011 Spain
| | - L. O. Salmazo
- Condensed Matter Physics Department, Cellular Materials Laboratory (CellMat); University of Valladolid; Paseo Belén 7, Valladolid 47011 Spain
| | - A. Lopez-Gil
- CellMat Technologies S.L., Paseo de Belen 9-A (CTTA Building); Valladolid 47011 Spain
| | - E. Laguna-Gutierrez
- Condensed Matter Physics Department, Cellular Materials Laboratory (CellMat); University of Valladolid; Paseo Belén 7, Valladolid 47011 Spain
| | - M. A. Rodriguez-Perez
- Condensed Matter Physics Department, Cellular Materials Laboratory (CellMat); University of Valladolid; Paseo Belén 7, Valladolid 47011 Spain
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Laguna-Gutierrez E, Escudero J, Kumar V, Rodriguez-Perez MA. Microcellular foaming by using subcritical CO2 of crosslinked and non-crosslinked LDPE/clay nanocomposites. J CELL PLAST 2016. [DOI: 10.1177/0021955x16681451] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The semicrystalline character of low density polyethylene adds severe difficulties to its foamability by a batch process in which the gas is dissolved into the polymer matrix under subcritical conditions. To improve the low density polyethylene foamability, two strategies have been used: the addition of nanoclays and a partial crosslinking of the polymer matrix. On the one hand, the use of nanoparticles is suggested because they act as heterogeneous nucleating sites reducing the cell size and increasing the cell density. On the other hand, crosslinking is also adopted as a solution because both the crystallinity (and hence, the gas solubility and diffusivity) and the extensional rheological properties of the polymer matrix are highly influenced by the crosslinking degree achieved. Results indicate that despite the fact that the presence of nanoclays deteriorates the rheological behaviour of the nanocomposites and, hence, the later foaming behaviour, the use of partially crosslinked polymer matrices allows achieving high expansion ratios (around 7.5) as well as enhanced cellular structures with cell sizes of approximately 15 µm.
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Affiliation(s)
- Ester Laguna-Gutierrez
- Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Valladolid, Spain
| | - Javier Escudero
- Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Valladolid, Spain
| | - Vipin Kumar
- Department of Mechanical Engineering, University of Washington, Seattle, USA
| | - Miguel A Rodriguez-Perez
- Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Valladolid, Spain
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Sabet M, Savory RM, Hassan A, Ratnam CT. The Effect of TMPTMA Addition on Electron-beam Irradiated LDPE, EVA and Blend Properties. INT POLYM PROC 2013. [DOI: 10.3139/217.2723] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
In this work low density polyethylene (LDPE) and ethylene vinyl acetate (EVA) were blended in the presence of trimethylol propane trimethylacrylate (TMPTMA) (0 to 6 phr). The resultant blends were irradiated with a 3 MeV electron-beam resulting in dosages of 0 to 240 kGy using a rhodotron accelerator system. The effect of radiation exposure on the LDPE/EVA/TMPTMA blend properties were investigated with respect to gel content, tensile strength and elongation up to breakage of the blends. The findings indicate that increasing EVA and TMPTMA content yield tighter network structures through enhanced blend crosslinking, which is a direct consequence of irradiation. For pure EVA significant tensile strength improvements are evident as irradiation increases up to 210 kGy. Irradiated blends exhibit improved tensile strength and elongation at breakage with respect to pure LDPE and EVA. Volume resistivity (VR) and dielectric constant (DC) of the blends were also studied as a function of EVA content, TMPTMA content and radiation dosage. Increasing EVA and TMPTMA content enhances DC and VR values, whereas, increasing irradiation dosage only effects VR values of the blends. The maximum VR value attained in this work corresponds to a radiation dosage of 170 kGy and a blend comprising of 30 wt% of EVA.
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Affiliation(s)
- M. Sabet
- Chemical Engineering Faculty, Universiti Teknologi Petronas (UTP), Bandar Seri Iskandar, Tronoh, Perak, Ipoh, Malaysia
- Chemical Engineering Faculty, Universiti Teknologi MARA (UiTM), Shah Alam, Selangor, Malaysia
| | - R. M. Savory
- Chemical Engineering Faculty, Universiti Teknologi Petronas (UTP), Bandar Seri Iskandar, Tronoh, Perak, Ipoh, Malaysia
- Chemical Engineering Faculty, Universiti Teknologi MARA (UiTM), Shah Alam, Selangor, Malaysia
| | - A. Hassan
- Chemical and Natural Resources Engineering Faculty, Department of Polymer Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
| | - C. T. Ratnam
- Malaysian Nuclear Agency, Bangi, Kajang, Malaysia
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Tran MP, Detrembleur C, Alexandre M, Jerome C, Thomassin JM. The influence of foam morphology of multi-walled carbon nanotubes/poly(methyl methacrylate) nanocomposites on electrical conductivity. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.03.053] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wang B, Wang M, Xing Z, Zeng H, Wu G. Preparation of radiation crosslinked foams from low-density polyethylene/ethylene-vinyl acetate (LDPE/EVA) copolymer blend with a supercritical carbon dioxide approach. J Appl Polym Sci 2012. [DOI: 10.1002/app.37826] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Characterization of plasticized maize starch/chitosan blends irradiated with an electron beam. JOURNAL OF POLYMER RESEARCH 2012. [DOI: 10.1007/s10965-012-9855-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Mechanical, electrical, and thermal properties of irradiated low-density polyethylene by electron beam. Polym Bull (Berl) 2012. [DOI: 10.1007/s00289-012-0741-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kwon YJ, Park WY, Hong SM, Koo CM. Foaming of recycled crosslinked polyethylenes via supercritical decrosslinking reaction. J Appl Polym Sci 2012. [DOI: 10.1002/app.36617] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Relationship between the cell structure and mechanical properties of chemically crosslinked polyethylene foams. J Appl Polym Sci 2011. [DOI: 10.1002/app.35267] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Azevedo JB, Chávez MA, Rabello MS. Efeito de reticulante na morfologia e propriedades físico-mecânicas de espumas poliméricas obtidas com EVA e EPDM. POLIMEROS 2011. [DOI: 10.1590/s0104-14282011005000002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Espumas poliméricas são materiais bifásicos constituídos por uma matriz polimérica sólida e por uma fase gasosa proveniente de um agente de expansão. Produtos obtidos com estes materiais vêm ganhando bastante espaço no mercado por apresentar boas propriedades mecânicas aliadas à baixa densidade e baixo custo. O uso de EVA com elastômeros tem sido uma alternativa para proporcionar propriedades mais nobres a esses compostos expansíveis. Dentre os elastômeros utilizados, o EPDM apresenta um potencial de aplicação elevado por apresentar boa compatibilidade com as poliolefinas. Como na fabricação da espuma tem-se simultaneamente reações de reticulação e de formação gases de expansão, o balanço desses efeitos tem forte influência sobre as características físicas do produto. Neste estudo, avaliou-se o efeito de um agente reticulante nas formulações de espumas de EVA/EPDM. As propriedades físico-mecânicas, reométricas e morfológicas de misturas EVA/EPDM com diversas proporções de peróxido de dicumila, utilizado como agente de reticulação, foram avaliadas. Os resultados mostraram que o teor de reticulante apresenta forte influência nas características técnicas das espumas obtidas.
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