Polymer Structure Hardness Relationship

[KatrinaStone]

Hello,

I want to know, where I can find information about the relationship between Hardness and Molecular Weight, Broad Molecular Weight distribution, crystallinity, branching, crosslinking, polarity, rigid chemical structure; because I only find a cualitative relationship but I need the relationships mechanisms...

THANK YOU!!

 

[CoryPad]

You will find this information in textbooks and technical journal articles. For example, on page 248 of Deformation and Fracture Mechanics of Engineering Materials, Fourth Edition by R. W. Hertzberg, there is a graph showing strength versus molecular weight for polycarbonate. This was reprinted from a journal article - J. H. Golden et al., J Poly Sci, 2A, 4787 (1974).

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[MetalMan14]

Try "Polymer Science and Technology", authored by Joel R. Fried. Pay close attention to the Critical Molecular Weight of the polymer you are using, this the molecular weight in which stable polymer chain entaglements are acheived. Most of what you are looking for will be found in ordinary text books as the one listed above.