BIO-PLASTICS

PLASTICS FOR FUTURE…

MEGHA YADAVDept. of Biochemistry

Patna UniversitySession – 2012-14

1) INTRODUCTION

Bio plastics are a form of plastics derived from renewable biomass sources, such as corn, sugar cane, Potatoes etc

Biodegradable plastics can be degraded biologically.

Corn

Sugar Cane

2) HISTORICAL PERSPECTIVE

 In 1869 a bio plastic comprised of cellulose was used by an American inventor (John Wesley Hyatt) to coat billiard balls.

 in the 1920's Henry Ford experimented with the use of soybean based plastics 

 Bio plastics now come in many forms from cellulose based, to starch based, and are a popular choice for single use items like biodegradable poly bags.

3) BACKGROUND OF STARCH-BASED POLYMERS

Chemical formula of starch (C6H10O5)n

There are actually two types of starch molecules:

Amylose Amylopectin.

Amylose is essentially linear while Amylopectin has many branches like a tree.

4) CHEMISTRY OF STARCH AMYLOSE

Amylose molecules consist of single mostly-unbranched chains with 500-20,000 α-(14)-D-glucose units dependent on source.

B) AMYLOPECTIN Amylopectin is formed by non-random α-1-6

branching of the amylose-type α-(1-4)-D-glucose structure.

Each amylopectin molecule contains a million or so residues

5) POLYLACTIC ACID (PLA)

Fig: Polylactic acid condensation reaction

5) VARIETIES OF STARCH

USES OF BIODEGRADABLE PLASTICS

Plastic Type USE

1. Polylactic acid (PLA) Packaging and paper coatings

2. Polyglycolic acid (PGA) Specialized applications; controlled drug releases.

3. Polyhydroxybutyrate(PHB)

Products like bottles, bags, wrapping film etc.

4. Polyvinyl alcohol(PHV)

Packaging and bagging applications which dissolve in water to release products such as laundry detergent, pesticides, and hospital washables

5. Polyvinyl acetate(PVAc

Adhesives, the packaging applications includeboxboard manufacture, paper bags, paper lamination

5)BEST PARTS OF BIODEGRADABLE PLASTICS

6)DISPOSABLE METHODS ANAEROBIC DIGESTION Methane production as a useful end-

product, compost, is also produced

7) IN GENERAL OPEN ENVIRONMENT AS LITTER

8) DEMERITS OF BIODERADABLE PLASTIC

Production cost is very high

Expensive

Precautions are compulsory for storage

FUTURE OUTLOOK FOR BIODEGRADABLE PLASTICS Researchers worldwide are interested

in the area of biopolymer development.

COATED PAPER

AGRICULTURE MULCH FILM

SHOPPING BAGS

Pens and mobile phones

10) CONCLUSION

Needs our attention and participation

Eco-friendly

Very promising technique for future...

REFERENCES

http://www.sciencedirect.com/science/article

http://saferenvironment.wordpress.com

Bioplastic - Wikipedia, the free encyclopedia.htm

THANK YOU….