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Polylactic acid:Polylactic acid:structure, properties, structure, properties,

synthesis and application synthesis and application

Tatyana N. Volgina Tatyana N. Volgina Department of Technology of basic organic Department of Technology of basic organic synthesis and high-molecular compoundssynthesis and high-molecular compounds

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Purposes of presentation

Modern data of PLA synthesis

Unusual properties of PLA

Perspectives of application of PLA

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What is the main ecological problem ?What is the main ecological problem ?

Oil and gas

Industrial wastes

It is destructed during thousand

years

Dirty Planet

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What is PLA?What is PLA?

Biodegradable

Biocompatible

Thermoplastic

Aliphatic polyether

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How to obtain PLA?How to obtain PLA?

starch

enzyme hydrolysis

- H2O

- H2Olactic acid

microbiological process

fermentation

dextrose

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Lactid polymerizationLactid polymerization

ring formation -H2O

PLA Low Molecular Weight

PLA High Molecular Weight

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PLA as packaging materials

PLA holdstemperatures

from -40 °C

to 250 °C

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PLA as fibers

Gattinoni Wedding Dress made from

PLA fibers

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PLA as the solid substrate

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PLA as implant materials

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PLA as an engineering plastics

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Biodegradation of PLA: In the composting plant, a cup is completely

decomposed by microorganisms withinabout 5 weeks (Source: NatureWorks LLC)

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Aerobic conditionsWaste

MicroorganismsCH4 + H2S + NH3

Anaerobic conditions

CO4 + H2O + NO2

The main factors of biodegradation: air, water, day light, temperature, microorganisms

Biodegradation is a complex process

The main products of biodegradation: carbon dioxide, methane, water

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PLA is a new alternative for consumption

Conclusion