scholarly journals GPC-VIS-MALS study of EVA copolymers: Quantification and interactions of SCB and LCB

2016 ◽  
Vol 52 ◽  
pp. 265-271 ◽  
Author(s):  
Inmaculada Suárez ◽  
Baudilio Coto
Keyword(s):  
Eva Copolymers

TG and DSC as tools to analyse the thermal behaviour of EVA copolymers

2021 ◽  
pp. 009524432098816
Author(s):  
E Díez ◽  
A Rodríguez ◽  
JM Gómez ◽  
J Galán
Keyword(s):  
Vinyl Acetate ◽  
Thermal Behaviour ◽  
Isothermal Crystallization ◽  
Amorphous Polymer ◽  
Polymer Backbone ◽  
Avrami Model ◽  
Melting Temperatures ◽  
Melting And Crystallization Temperatures ◽  
Melting And Crystallization ◽  
Eva Copolymers

This paper analyses the thermal behaviour of six EVA copolymers supplied by REPSOL Company. In relation to crystallization and melting temperatures, both of them decrease when the vinyl acetate percentage increases, in agreement with the fact that polyethylene is a semi-crystalline material, whereas polyvinylacetate is an amorphous polymer. Actually, when the vinyl acetate percentage reaches 30%, the copolymer is practically amorphous. The non-isothermal crystallization was modelled with the modified Avrami model that showed, with the exception of EVA-460 (the material with higher vinyl acetate percentage), the presence of a secondary crystallization due to spherulite impingement in the later stage of the non-isothermal crystallization. The TG analysis indicated two weight loss stages, the first one due to acetic acid loss and the second one due to fragments of polymer backbone, which appear as two separate peaks in the DTG plots. Finally, due to the linear dependence of melting and crystallization temperatures and of the minimum value of DTG peaks on vinyl acetate percentage, it can be concluded that both TG and DSC techniques can be employed to determine the vinyl acetate percentage of a certain copolymer.

Rheology, Electrical Properties, and Percolation of TRGO-Filled EVA-Copolymers

2014 ◽  
Vol 299 (9) ◽  
pp. 1134-1144 ◽  
Author(s):  
Karl-Friedrich Ratzsch ◽  
Volkan Cecen ◽  
Folke Tölle ◽  
Karen-Alessa Wartig ◽  
Ralf Thomann ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Eva Copolymers

Examining the Decomposition of Ethylene-Vinyl Acetate Copolymers Using TG/GC/IR

1994 ◽  
Vol 48 (12) ◽  
pp. 1472-1476 ◽  
Author(s):  
Brian J. McGrattan
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Straight Chain ◽  
Thermally Induced ◽  
Trapped Gases ◽  
Straight Chain Hydrocarbon ◽  
Complex Polymer ◽  
Made In ◽  
Eva Copolymers

With a combination of information from TG/IR and GC/IR measurements of the trapped gases, characterization of complex polymer decompositions can be made. In this paper, the thermally induced breakdown of ethylene-vinyl acetate (EVA) copolymers was studied. Results show that EVA undergoes a two-step decomposition: an acetate pyrolysis of the copolymer leaving a polyunsaturated linear hydrocarbon, followed by the breakdown of the hydrocarbon backbone to produce a large number of straight-chain hydrocarbon products.

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