How can I use the amorphous cell to build a new polymer ensemble successfully?

Dear All,
       I was using the Materials Studio to build a brand new polymer. The polymer is Polynippam-co-Polyurethane which is normal. I drawed it myself and then used Amorphous cell package to build a cell contained one polymer chain. Then I used Forcite package to run energy minimization. But the status of energy minimization is " No convergence after 10000 iterations". Could you give me some ideas to solve this problem? Thank you very much for your help!

Derrick