Structural characterization of electron-beam crosslinked thermoplastic elastomeric films from blends of polyethylene and ethylene-vinyl acetate copolymers

2001 ◽  
Vol 81 (8) ◽  
pp. 1936-1950 ◽  
Author(s):  
S. Chattopadhyay ◽  
T. K. Chaki ◽  
Anil K. Bhowmick
Keyword(s):  
Electron Beam ◽  
Vinyl Acetate ◽  
Structural Characterization ◽  
Ethylene Vinyl Acetate

scholarly journals Design and Characterization of a Screw Extrusion Hot-End for Fused Deposition Modeling

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 590
Author(s):  
Tim Feuerbach ◽  
Markus Thommes
Keyword(s):  
Vinyl Acetate ◽  
Fused Deposition Modeling ◽  
Ethylene Vinyl Acetate ◽  
Direct Printing ◽  
Fused Deposition ◽  
Screw Extrusion ◽  
Deposition Modeling ◽  
Feedstock Material ◽  
Material Form

The filament is the most widespread feedstock material form used for fused deposition modeling printers. Filaments must be manufactured with tight dimensional tolerances, both to be processable in the hot-end and to obtain printed objects of high quality. The ability to successfully feed the filament into the printer is also related to the mechanical properties of the filament, which are often insufficient for pharmaceutically relevant excipients. In the scope of this work, an 8 mm single screw hot-end was designed and characterized, which allows direct printing of materials from their powder form and does not require an intermediate filament. The capability of the hot-end to increase the range of applicable excipients to fused deposition modeling was demonstrated by processing and printing several excipients that are not suitable for fused deposition modeling in their filament forms, such as ethylene vinyl acetate and poly(1-vinylpyrrolidone-co-vinyl acetate). The conveying characteristic of the screw was investigated experimentally with all materials and was in agreement with an established model from literature. The complete design information, such as the screw geometry and the hot-end dimensions, is provided in this work.

Preparation and characterization of ethylene-vinyl acetate/halloysite nanotube nanocomposites

2015 ◽  
Vol 50 (8) ◽  
pp. 3237-3245 ◽  
Author(s):  
Hossein Cheraghi Bidsorkhi ◽  
Hossein Adelnia ◽  
Raheleh Heidar Pour ◽  
Mohammad Soheilmoghaddam
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Halloysite Nanotube

Electron Beam Initiated Grafting and Crosslinking of Ethylene Vinyl Acetate Copolymer. Part-I: Structural Characterization

1996 ◽  
Vol 69 (1) ◽  
pp. 120-129 ◽  
Author(s):  
Sujit K. Datta ◽  
Tapan K. Chaki ◽  
Anil K. Bhowmick
Keyword(s):  
Electron Beam ◽  
Radiation Dose ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Carbonyl Groups ◽  
Gel Content ◽  
Lower Radiation Dose ◽  
Absorbance Peak ◽  
Crosslinking Reactions ◽  
Acetate Copolymer

Abstract Electron beam irradiation of Ethylene vinyl acetate, EVA (VA content 12, 28 & 45%) copolymer was carried out in presence of trimethylolpropane trimethacrylate (TMPTMA) and triallyl cyanurate (TAC) and the structure of the modified copolymers was determined with the help of IR spectroscopy and gel content measurements. The IR absorbance peak at 1640 cm−1 disappears at lower radiation dose indicating that the grafting and crosslinking reactions take place through double bonds. Some carbonyl groups are formed during irradiation. The concentration of carbonyl group increases with the radiation dose and the level of multifunctional monomers. The grafting level of TAC onto EVA determined from IR absorbance peak at 1565 cmx−1 remains almost constant with the variation of radiation dose and increases with TAC level. The gel content increases with radiation dose, but changes marginally with TMPTMA and TAC levels. The percent gel content increases linearly with vinyl acetate content in EVA.

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