Definition Of Terms

DEFINITION OF TERMS

Additives A substance added to a basic resin to alter the physical and chemical properties of the resin Amorphous Molecules of material are arranged randomly and in long chain which twist and curve around one another Biodegradation chemical change in polymer facilitated by living organisms usually microorganisms. Compressive strength the maximum load sustained by a test specimen in a compressive test divided by the area of the specimen Conformation study of the orderliness and disorderliness structure of macromolecule solids Copolymer Typically a polymer of two chemically distinct monomers Crystallinity structure of solids whose molecules are arranged in repeating patterns or in order. Extrusion The process of forming continuous shapes by forming molten plastic through a die. Typical shapes are hoses, flat sheets, or parison for blow molding Enzyme Protein substances which make most of chemical reaction occurring in living organism Filler Typically inert substance added to plastic compound to reduce cost or improve physical properties such as hardness, stiffness, impact strength, thermal conductivity, or electrical conductivity Flexural strength The maximum stress in the outer fiber at the moment of crack or break. In the case of plastics, this value is usually higher than the straight tensile strength. Also known as modulus of rupture

Grafted polymers Polymers may be grafted with compatibilizers to increase recyclability. A grafted polymer refers to a polymer comprising molecules in which the main backbone chain of atoms has attached to it at various points side chain containing different atoms or groups from those in the main chain HDPE ( High density Polyethylene ) Polyethylene plastic having a density typically between0.940 and 0.960 g/cm 3 while LDPE are branched and linked in a random fashion. HDPE chains are linked in longer chains and have fewer side branches. Homopolymer A polymer resulting from polymerization of a single monomer a polymer consisting substantially of a single type of repeating unit. Injection molding The process of manufacturing with plastics by forcing a molten plastic into a mold under pressure. PS Polymer of styrene somewhat brittle and is often copolymerized or blended with other materials to obtain a desired properties

Mixed Plastics A resin of plastics the components of which may have widely differing properties. Monomer A compound which typically contains carbon and is of low molecular weight which reacts to form a polymer by combination to itself or with other similar compounds. Morphology The study of the form and structure of material PBP Protein based polymer that occur in nature with extraordinary mechanical properties such as spider silk. .Pelletizing cleaned flakes are melted and extruded to produce small pellets similar to virgin resin pellets PE A family of resins made by polymerizing the gas ethylene

PET A saturated thermoplastics polyesters formed by condensing ethylene glycol and terephthalic acid. PP A thermoplastic resin made by polymerizing propylene with suitable catalyst. It has a density of 0.900 g/cm 3 PVC Polymer of vinyl chloride produced by polymerization of vinyl chloride with peroxide catalyst