Dear All,

I'm going to model a nanocomposite with 'Epoxy Epon 828' polymer matrix. as  you may know, 'epon 828' is a copolymer composed of 'Bisphenol A' and  'Epichlorohydrin'. I have all 'epon 828', 'Bisphenol A' and  'Epichlorohydrin' molecules in *.mol format and can import them in materials studio. now, I want to know the difference between these two following tasks:

1- building a copolymer using 'Bisphenol A' and 'Epichlorohydrin'  molecules.

2- building a homopolymer using "epon 828' molecules?

... and one more related question:

are the head and tail atoms unique? in other words,  how can I recognize the correct head and tail atomes in a molecule in order to build a repeat unit?

thanks in advance.

best regards,

Behrooz Arab.