Ethylene-ethyl acrylate copolymers behave similarly to ethylene-vinyl acetate copolymers. The polymerization of monomers into copolymers is called copolymerization. EO/PO based defoamers contain polyethylene glycol and polypropylene glycol copolymers. Dicarboxylic acids are also used in the preparation of copolymers such as polyamides and polyesters. Styrene is the precursor to polystyrene and several copolymers. It is also used in block copolymers and tough thermoplastics such as ABS plastic. Vinyl acetate-crotonic acid copolymers give harder films. Similar phases and characteristics can be observed in immiscible diblock copolymers. It is also possible to incorporate N, HO, and CO into copolymers of styrene. Polypropylene copolymers are in use as well. Styrenics consists of the Foams and Copolymers. However, AuNPs conjugated with PEG copolymers showed negligible toxicity towards human colon cells (Caco-2). All synthesis methods can be employed to create general physical properties of graft copolymers. Proteins and some block copolymers are such examples. There are many different approaches to synthesizing graft copolymers.