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Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
T-peel is the performance on an ASTM D1876 test. It applies to adhesives not to structural resins.
What you're not considering is the mass of the system - you may only gain 3% in shear strength (which is measured per unit area), but if the CNTs reduce the density of the resin by 50% then you can make a structure more than twice as strong per unit mass.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
AndrewM wrote ...
T-peel is the performance on an ASTM D1876 test. It applies to adhesives not to structural resins.
What you're not considering is the mass of the system - you may only gain 3% in shear strength (which is measured per unit area), but if the CNTs reduce the density of the resin by 50% then you can make a structure more than twice as strong per unit mass.
excellent, hence me asking those of you who point these matters out!
im wondering if they mean this epovex to be used to join panels already cured, thus the T-peel measure...
Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
Patrick wrote ...
im wondering if they mean this epovex to be used to join panels already cured, thus the T-peel measure...
Yeah they're pretty clearly marketing that goop as a repair adhesive.
Repair and maintenance applications are an ideal segment for Zyvex to demonstrate the power of nanomaterial engineered products. With a bonding strength stronger than welding, Epovex® Adhesive allows our customers to rapidly repair and maintain their products with the confidence that the latest in materials technology is hard at work.
There really isn't anything innovative about throwing CNTs into epoxy - everyone does this, its hard to make a name brand product out of something that industry already mixes up on their own by the ton. A better epoxy (for example with greater adhesion) would be an innovation (as they seem to have achieved), but also fairly irrelevant in a structural sense.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Supposedly, CNTs are phobic to just about everything, polar or non. So, it seems these companies all come up with clever corona -like modding to increase wettability, similar to the low surface energy plastics.
I'm going to continue investigating the CNT epoxy, but I'm going to stick with conventional epoxies due to familiarity and favorable viscosity.
It's mostly stiffness I need in my drone airframes, so I'm not sure if that's entirely a fiber/geometry controlled effect or if a high tensile measured epoxy will help.so if evopex reduces density/mass (by at least 30%), then I could add more fiber cloth, yet keep the same mass overall. That would be a plus, as AndrewM has lead me to conclude...
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nanotube doped epoxy for composite structures.
