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Viscosity Modifiers II #5131335
06/11/19 11:57 AM
06/11/19 11:57 AM
Joined: Jun 2002
Posts: 20,084
Iowegia - USA
MolaKule Offline OP
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MolaKule  Offline OP
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Iowegia - USA
There are three (3) key features of polymer viscosity modifiers, specifically VII VM's:


Name those three key features:

1)

2)

3)


This question is open to ALL.


Science is about objective reality, not consensus.
Re: Viscosity Modifiers II [Re: MolaKule] #5132150
06/12/19 09:25 AM
06/12/19 09:25 AM
Joined: Mar 2015
Posts: 12,939
In the shop
53' Stude Online content
53' Stude  Online Content

Joined: Mar 2015
Posts: 12,939
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They help reduce a lubricants viscosity change at high AND low temps



Re: Viscosity Modifiers II [Re: MolaKule] #5132180
06/12/19 10:04 AM
06/12/19 10:04 AM
Joined: Jun 2002
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Iowegia - USA
MolaKule Offline OP
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MolaKule  Offline OP
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Originally Posted by 53 Stude
They help reduce a lubricants viscosity change at high AND low temps

They do modify the rate of change in viscosity verses temperature.

I'll give a Hint to help things along. Please identify the other two features:
Originally Posted by MolaKule
There are three (3) key features of polymer viscosity modifiers, specifically VII VM's:


Name those three key features:

1) thickening efficiency

2)

3)


This question is open to ALL.


Last edited by MolaKule; 06/12/19 10:21 AM.

Science is about objective reality, not consensus.
Re: Viscosity Modifiers II [Re: MolaKule] #5132279
06/12/19 12:20 PM
06/12/19 12:20 PM
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Western S.C.
CR94 Offline
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They should be cost-effective.
They should be free of characteristics that would make it difficult to meet other requirements.
They should be as nearly shear-stable as possible.


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Re: Viscosity Modifiers II [Re: MolaKule] #5132288
06/12/19 12:31 PM
06/12/19 12:31 PM
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Western Ma.
rollinpete Offline
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improved viscosity index,
enhanced thickening efficiency,
and appropriate shear stability.

So viscosity modifiers help keep the oil at it's original viscosity through out it's career as a lubricant?


Pete.

97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive187k miles
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Re: Viscosity Modifiers II [Re: MolaKule] #5134143
06/14/19 03:20 PM
06/14/19 03:20 PM
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MolaKule Offline OP
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Thanks to all who responded and since this question was open to ALL, I thought there might be more responses.

Congratulations to rollinpete who supplied all three answers.

Thickening efficiency, the viscosity-temperature relationship, and shear stability are all Key features of Viscosity Index Improvers.

No one VI Improver can deliver optimum performance in all three areas, which is why new VII's have been developed which enhance overall polymer performance.

For example, the PAMA-OCP VII chemically "grafts" PAMA molecules onto the OCP backbones to improve the performance in all three areas.


Last edited by MolaKule; 06/14/19 04:17 PM.

Science is about objective reality, not consensus.
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