Zobrazeno 1 - 10
of 445
pro vyhledávání: '"J.M. Vergnaud"'
Autor:
J.M. Vergnaud, I.D. Rosca
Publikováno v:
Polymer Testing. 23:59-67
Using moving die rheometers under isothermal conditions, as usual, for determining the kinetic parameters of the cure of rubbers leads to two types of drawback. The first, because of the three experiments at least which are necessary at temperatures
Publikováno v:
Polymers and Polymer Composites. 12:87-98
In spite of their drawbacks, rheometers are usually run under isothermal conditions for the cure of rubbers: At least three experiments are needed at different temperatures selected within a narrow temperature window to determine the kinetic paramete
Autor:
I.D. Rosca, J.M. Vergnaud
Publikováno v:
Polymer. 44:4067-4074
Because of the drawbacks resulting from using a constant temperature, calorimetry has been developed with scanning mode and temperature programming with a constant heating rate. Following this way, a theoretical approach was made with moving die rheo
Autor:
J. Ben Abdelouahab, J.M. Vergnaud
Publikováno v:
Polymer Testing. 22:203-208
Chemicals, especially in the liquid state, can enter thermosetting polymers. Thus, the process of absorption of styrene by cured unsaturated polyester is found to be controlled by transient diffusion with a constant diffusivity. Moreover, the amount
Publikováno v:
Polymer. 43:4261-4267
Anisotropic swelling of thin EPDM discs is observed when they are in contact with toluene resulting from the liquid absorption. The process is controlled by transient diffusion, with a concentration-dependent diffusivity and a finite coefficient of c
Publikováno v:
Plastics, Rubber and Composites. 31:220-225
When EPDM discs are in contact with a liquid such as toluene, a mass transfer takes place. The process is controlled by transient diffusion, with a concentration dependent diffusivity and a finite coefficient of convective transfer at the liquid/rubb
Autor:
J.M. Vergnaud, I.D. Rosca
Publikováno v:
Polymer. 43:195-202
Rheometers, especially the moving die rheometer (MDR), is used under isothermal conditions for the cure of rubbers. Thus, at least three experiments are necessary at different temperatures selected within a rather narrow temperature window, for deter
Publikováno v:
Polymers and Polymer Composites. 9:515-522
Repairing broken thermoset pieces is often carried out, although optimization of the technique may not have been achieved. A new way is investigated using a thermoset based on an unsaturated polyester resin allowing the final product to exhibit good
Autor:
J.M. Vergnaud, I.D. Rosca
Publikováno v:
Plastics, Rubber and Composites. 30:275-281
Rheometers, especially moving die rheometers (MDR), are widely used for evaluating the kinetic parameters of the cure of rubbers. Experiments are run under isothermal conditions at three temperatures and the reaction is followed by measuring the torq
Publikováno v:
Polymer Testing. 20:563-568
Because chemicals diffuse through food packages made of polymers, determination of the diffusivity through these polymers is of prime importance. The best method for doing this consists of putting in contact two polymer sheets, one containing the che