injection molding process for biopolymers

ABIN DAVISBIBIN PAULJAYALAL RCBPST, COCHI

BIOPOLYMER

Biodegradable polymers are defined as those that undergo microbially induced chain scission leading to the mineralization.

Biopolymers refers to the material that are either biodegradablederived renewable and non renewable resources(according to ASTM D 6400 99 & EN 13432) or the materials are non biodegradable and derived from renewable resources(ASTM D 6866) Biopolymers can be divided into to two maingroups . One group contains the biodegradablepolyesters, which are petroleum based, but they arebiodegradable. The other group contains polymersfrom renewable resources, like thermoplastic starchor poly-lactic-acid (PLA). Both TPS and PLA canbe produced from common, natural resource, andthey are readily biodegradable.

Polylactic acid or polylactide (PLA) is a thermoplastic aliphatic polyester derived from renewable resources, such as corn starch , tapioca roots, chips or starch or sugarcane . In 2010, PLA was the second most important bio plastic of the world in regard to consumption volume.

POLY LACTIC ACID (PLA)

PLA has a crystalline of around 37%, a glass transition temperature between 60-65 °C, a melting temperature between 173-178 °C and a tensile modulus between 2.7-16 GPa

Processing condition for PLA

APPLICATIONS

The glycerol and water plasticized starch was processed in a twin screw extruder and then with an injection moulding machine to produce TPS products.

Starch has a granular structure,which is built by two main carbohydrate polymers:the linear amylose and the highly branched amylopectin.

Plasticizers like glycerol or water have to beused while processing, because of the low decompositiontemperature of the granular starch.

STARCH

APPLICATIONS

Poly (butylene succinate)

INJECTION MOULDING OF POLY(HYDROXYBUTYRATE)

COMMERCIALLY AVAILABLE BIOPOLYMERS WITH PROCESSING TEMPERATURE

THANK YOU…..

S TUDYWELL…..