Viscoelastic rheology in the melting and crystallization domain: Application to polypropylene copolymers

2017 ◽  
Vol 134 (15) ◽  
Author(s):  
Margaux Aris-Brosou ◽  
Michel Vincent ◽  
Jean-François Agassant ◽  
Noëlle Billon
Keyword(s):  
Viscoelastic Rheology ◽  
Melting And Crystallization

Melting and Crystallization of Poly(oxyethylene) Mixtures

1995 ◽  
Vol 60 (11) ◽  
pp. 1855-1868 ◽  
Author(s):  
Ivo Lapeš ◽  
Josef Baldrian ◽  
Ján Biroš ◽  
Julius Pouchlý ◽  
Hanes Mio
Keyword(s):  
Melting Point ◽  
Lamellar Structure ◽  
Composition Dependence ◽  
Eutectic Phase ◽  
Eutectic Melting ◽  
Pure Polymer ◽  
X Ray ◽  
Long Period ◽  
Solid Liquid ◽  
Melting And Crystallization

Solid-liquid eutectic phase diagrams of mixtures of poly(oxyethylene) (M.w. 2 000) with hydroxy and methoxy endgroups, crystallizing in extended-chain macroconformation only, with glutaric acid, benzoic acid or 1,2-diphenylethane are given. The composition dependence of the melting temperature can be fitted by the Flory-Huggins equation. Interaction parameters X and interaction energy densities B evaluated from the diluent branch of the phase diagram are consistent with those obtained from the polymer branch provided the calorimetric value of enthalpy of polymer fusion is used in the latter computation. Measurements of small- and wide-angle X-ray scatterings showed a stacked lamellar structure of POE. Below the eutectic melting point, the long period of the polymer is almost independent of the diluent concentration. On raising temperature gradually from this melting point to the melting point of pure polymer, the increasing long period indicates the penetration of the diluent between the lamellae. As follows from SAXS measurements, the crystallinity of poly(oxyethylene) in the mixtures remains unchanged compared to that of the pure polymer.

Linear and non-linear viscoelastic rheology of hybrid nanostructured materials from block copolymers with gold nanoparticles

2011 ◽  
Vol 50 (3) ◽  
pp. 257-275 ◽  
Author(s):  
Cesar Mendoza ◽  
Nabil Gindy ◽  
Manfred Wilhelm ◽  
Amir Fahmi
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Nanostructured Materials ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Viscoelastic Rheology

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.

Sequential reordering in condensation copolymers, 2. Melting- and crystallization-induced sequential reordering in miscible poly(butylene terephthalate)/polyarylate blends

1996 ◽  
Vol 197 (9) ◽  
pp. 2869-2887 ◽  
Author(s):  
Zlatan Denchev ◽  
Marianna Sarkissova ◽  
Stoyko Fakirov ◽  
Ferdane Yilmaz
Keyword(s):  
Butylene Terephthalate ◽  
Melting And Crystallization

In situ Raman spectroscopic investigation of olefin multiblock copolymers during melting and crystallization

2018 ◽  
Vol 67 ◽  
pp. 31-36 ◽  
Author(s):  
Zhijun Nie ◽  
Peng He ◽  
Wei Yu ◽  
Chixing Zhou
Keyword(s):  
Spectroscopic Investigation ◽  
Multiblock Copolymers ◽  
Raman Spectroscopic ◽  
In Situ Raman ◽  
Melting And Crystallization

scholarly journals Influence of Waste Materials Containing Tungsten on Melting and Crystallization of Glass-ceramics

2012 ◽  
Vol 02 (04) ◽  
pp. 74-77
Author(s):  
Shaomin Lin ◽  
Bo Wang ◽  
Guishen Liu ◽  
Liqing Li ◽  
Xiaodong Hou
Keyword(s):  
Glass Ceramics ◽  
Waste Materials ◽  
Crystallization Of Glass ◽  
Melting And Crystallization

Melting and crystallization of nylon 6 containing copper chloride

1980 ◽  
Vol 25 (6) ◽  
pp. 1137-1143 ◽  
Author(s):  
A. Siegmann ◽  
Z. Baraam
Keyword(s):  
Copper Chloride ◽  
Nylon 6 ◽  
Melting And Crystallization
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