I have too many question about film strength:
It is said that synthetic basestocks have higher "film strengt" than conventional basetocks. Is that because of their uniform molecule structure, allowing "all" the H-atoms of one molecule to interact with H-atoms of the neighbor molecules?
Do the electrostatic properties of an ester result in an apparently high film strength or is film strenght only the result of the interaction between the molecules?
How do VII's effect film strength (not shear stability)? Comparing the film strength of let's say 2 PAO-based oils (unadditized). The one has an SAE 10w-40 viscosity, the other uses a "thinner" basestock and more VII's => SAE 5w-40. Would the SAE 10w-40 theoretically have the higher film strength?
Is the HTHS-viscosity a good indicator of the film strength, or is there no relation between filmstreng and this kind of dynamic viscosity?
Another confusing thing:
Fuchs Silkolene's statement about PAO from:
http://www.silkoleneoil.com/techtip4.htm
"In fact, on their own they are hopeless 'boundary' lubricants, with less load carrying ability than mineral oil".
Isn't "load carrying ability" the same as film strength?
How much does film strength matter when it comes to hydrodynamic lubrication, is the HTHS more interesting here?
Anyone, please help me "self studying" lubrication, thanks
It is said that synthetic basestocks have higher "film strengt" than conventional basetocks. Is that because of their uniform molecule structure, allowing "all" the H-atoms of one molecule to interact with H-atoms of the neighbor molecules?
Do the electrostatic properties of an ester result in an apparently high film strength or is film strenght only the result of the interaction between the molecules?
How do VII's effect film strength (not shear stability)? Comparing the film strength of let's say 2 PAO-based oils (unadditized). The one has an SAE 10w-40 viscosity, the other uses a "thinner" basestock and more VII's => SAE 5w-40. Would the SAE 10w-40 theoretically have the higher film strength?
Is the HTHS-viscosity a good indicator of the film strength, or is there no relation between filmstreng and this kind of dynamic viscosity?
Another confusing thing:
Fuchs Silkolene's statement about PAO from:
http://www.silkoleneoil.com/techtip4.htm
"In fact, on their own they are hopeless 'boundary' lubricants, with less load carrying ability than mineral oil".
Isn't "load carrying ability" the same as film strength?
How much does film strength matter when it comes to hydrodynamic lubrication, is the HTHS more interesting here?
Anyone, please help me "self studying" lubrication, thanks