Comsol user defined mateial model

Hi every body

I am using comsol for termo-mechanical strongly coupled analysis of polymers.Can anybody help me,i need to solve 2 tings.

1.I need to implement new material model in to the comsol

2.I need to solve contact with sliding

Is it possible to do it in comsol?if yes ,what is the approach

Thank u very much

I am also looking for answere to the same question. Plz share if some one knows the answere.