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I am studying material physics.

I heard in the class that every adhesion or bonding can occur only with frictional force.

Today, I tried to find a proper reference for this statement but I could not.

Is there any reference that every adhesion or bonding(esp. Injective moldings) can occur only with frictional force?

Or is there any way that can happen without frictional force?

For example, in the process of molding, when melted materials harden, why does it stick to the other material? How does the frictional force acts in this case?

I want some references regarding these.

Thank you!

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I'm not going to say it's wrong, but I think that statement should have been the other way around; frictional force can only occur with adhesion/bonding. And just to be clear, fluidic drag is parasitic and a form of resistance, but it's not strictly a friction –  Jim Jun 19 '13 at 18:22
    
@Jim Do you mean that the mechanism of molding does not include frictional force? –  Material physics Jun 19 '13 at 20:49
    
no, you misunderstand me. I'm not saying that molding does not include frictional force, I'm just trying to say that, in my opinion, the statement you heard in class seems backwards. "Friction occurs through adhesion or bonding" is a more precise statement. –  Jim Jun 19 '13 at 20:56
    
@Jim Ah!Thanks for the reply! –  Material physics Jun 19 '13 at 21:08

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