Answer to Question 1
Commodity resins are those that are sold in high volumes and are generally similar in properties from one supplier to another.
Answer to Question 2
The structures are dependent on the amount of branching in the molecules. When the branches are long and frequent, the molecules cannot pack tightly together thus preventing crystallization. This is LDPE. When the branches are short and infrequent, the molecules can pack together and crystals can form. This is HDPE. When the structure is similar to HDPE but with slightly longer and more frequent branches, the polymers cannot pack together and the density is low like LDPE, but other properties are like HDPE, this arrangement gives LLDPE.
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