Foam Insulation 2.0

Where can we find the ingredients/procedure to make spray foam insulation?

we are high school students who have decided to pattern our investigatory project after the soybean spray Foam Insulation. please help us. thanks.

http://www.powerhousetv.com/stellent2/groups/public/documents/pub/phtv_se_in_bu_000575.hcsp

http://www.biobased.net/

http://www.hgtvpro.com/hpro/bp_insulation/article/0,2617,HPRO_20150_3457625,00.html

Should I put spray foam insulation in my crawlspace?