Diffusion and Stress Cracking of Surfactants and Poly Ethylene

[ Forum ]

Posted by Diffusion-polymers.com on April 28, 2005 at 21:28:21:

In Reply to: Diffusion of surfactants (Arkopal, Igepal) into PE posted by Markus Haager on April 26, 2005 at 09:30:53:

Dear Markus Haager,

I put the answers to your questions in the respective order. Here it goes:

-We do have the diffusion coefficients in our library of the surfactants that you described
in Poly Ethylene.

-In case of occurrence of stress cracking by e.g. Igepal, the initial diffusion rate will increase,
but for the order of magnitude some more experimental data and simulations are required.

-We assume that the rate in oriented polyethylene PE is lower if the diffusion direction is perpendicular to the orientation.

Regards,

: Does anybody know where I can find diffusion coefficients for Arkopal or Igepal (or other types of surfactants) into PE?

: I am investigation environmental stress cracking and I try to shed some light on how surfactants accelerate crack growth in PE. As a result I have some further questions:

: If stress is applied to PE, will the rate of Diffusion increase?

: Is the rate of diffusion in orientated PE smaller than in isotropic PE?

: Any help would be appreciated!
: Regards
: Markus