How do the journal give permission for reusing of figures and tables in other publications?

According to the journal's copyright, CC-BY-NC-SA, there is no problem to re-use the figures and tables, as long as they are cited appropriately.

How the reviewers are chosen and how I can cooperate with journal as a reviewer?

In the process of reviewer selection, the editors search for the experts who are familiar with the research subject. If you would like to cooperate as a reviewer, please send us your C.V. We keep you in mind and whenever we receive a related manuscript, we use your collaboration in reviewing the manuscript.

Is the publication free?

The journal is open access and the publication in "Polyolefins Journal" is completely free of charges.