PLA (A polylactic acid ) - polyacid-L-lactide (PLLA)
|
The PLA has good mechanical properties compared to materials standard thermoplastics. Has low impact strength, comparable to polyvinylchloride - PVC unplasticized. Hardness, stiffness, impact and elasticity of PLA, are similar to those of PET. The oriented film of PLA can be folded or bent, has good resistance to twisting, typical properties of paper and foil and generally in plastic films do not located. These properties, high flexural modulus and high transparency make PLA film is comparable material to cellophane film.
| |
|
Name - Symbol
|
|
|
|
| |
Properties PLA |
|
|
|
- Transparente
- exceptional hardness
- Low density 1.25 kg / cm3
- Processability
|
| |
|
PLA Products range
|
|
|
PLA have high strength have sufficient strength
|
|
|
PLA Thermal properties |
|
|
PLA has a crystallinity of about 37%, glass transition temperature between 60-65 ° C, a melting temperature between 173-178ºC and a modulus of elasticity between 2.7 GPa. However, the heat-resistant PLA can withstand temperatures of 90C and degrades rapidly above this temperature in high humidity conditions. The PLA PET has similar mechanical properties but has a maximum temperature significantly lower continuous use. Due to the low Vicat softening temperature. Polylactic acid can be processed, as most thermoplastic fiber (eg, using conventional melt spinning process) and film.
|
|
|
PLA Physical properties |
|
|
In tests spiral flow, the MBS resins flow the same distance as the polycarbonate at significantly lower temperatures. This leads to higher productivity, lower energy consumption and less stress molded. It is a material that can be printed without surface treatment.
|
|
|
PLA Opticals properties |
|
|
Competes in terms of applications with other plastics such as polypropylene (PP) or polystyrene (PS), PLA is quite transparent, has high gloss and low haze. The optical properties of PLA are sensitive to the additives added and processing effects. Films and rigid containers are thermoformed high volume applications .
|
|
|
PLA Chemicals properties
|
|
|
The PLA, unlike PET, is not suitable to hold hot liquids. The low softening temperature of PLA also creates problems for the storage of products and production applications for the automotive industry. It has a heat sealability at temperatures lower than those of polyolefins and high transparency. It is resistant to aqueous products and fats, plus.
|
|
|
Procesability PLA |
|
|
The PLA can be processed is similar to the polyolefins (extrusion, injection molding and thermoforming)
| |
|
Polimerization PLA |
|
|
The first step in the process is the removal of starch from the biomass, this is typically obtained by milling corn; starch is then converted to sugar by enzymatic or acid hydrolysis. After having obtained the sugar, it is fermented by bacteria. The fermentation can be carried out through a continuous process or batchwise. Lactic acid must be separated from the mixture which is formed during fermentation and in most cases be purified before being polymerized. Can follow two ways to convert the lactic acid polymer high molecular weight, the first passing through the lactide,a process without solvent and an innovative method of distillation is used (the product which is obtained is polylactide), the second is the direct polymerization through a process of polycondensation producing polylactic acid, lactic acid is converted directly to PLA high molecular weight by a process based on organic solvents with azeotropic removal of water through distillation in both cases, it is possible to produce PLA.
|
|
|
Applications PLA |
|
|
The PLA is a versatile polymer that has many applications, including in the textile industry, in the medical industry and especially in the packaging, containers such as trays, bottles or flexible bags made from PLA. Ad ithin the textile industry, are known applications of PLA for creating fabrics used in upholstery, making cloths and clothing of awnings and canopies lightfastness UV PLA has become a very important material the medical industry, which has been operating for over 25 years. Due to its characteristics the PLA has become an ideal for implants in bones or tissues (orthopedic surgery, facial, chest, abdomen) candidate.Also polyacids (L-lactic-co-D, L-lactide) (PLDLLA) used as PLDLLA / TCP (scaffolds) for engineering bone.
| |
|
|
|
|
|
|