Polymer Rheology trees and plants-gum-arabic,cellulose ● seeds Guar gum,locust bean gum ● seaweed carageenan,alginates,agar ● fruit -pectins ● grains starches ● microbial xanthan gum ● animal -gelatin,keratin and petroleum -'acrylic acid,polyacrylamide,and many plastics. Kinds of Polymer Chains Long Rods Coils/Strings BranchingPolymer Rheology Kinds of Polymer Chains Long Rods Coils/Strings Branching