The polylactide is versatile fibre. “Polylactic acid or polylactide is a thermoplastic aliphatic polyester”. It is derived from renewable resources such as corn starch, , tapioca roots, chips or starch or sugarcane. There are two main monomers used to produce polylactic acid or polylactide. These monomers are lactic acid, and the cyclic di-ester. Polylactic acid is manufactured by using ring-opening polymerization.
After this polycondensation is carried out in the melt or as a solution, “where short oligomeric units are linked to give a high molecular weight polymer strand”. Water generated in during this reaction is removed by using vacuum or azeotropic distillation, which is crucial to favour polycondensation over transesterification. Even higher molecular weights can be attained by carefully crystallizing the crude polymer from the melt. Carboxylic acid and alcohol end groups are thus concentrated in the amorphous region of the solid polymer, and so they can react.
2 - The glass transition temperature of polylactide ranges between 60°C - 65 °C.
3 - The polylactide begins to melt at a temperature between 173°C -178 °C.
4 - Heat resistance: polylactide fibre can remain stable at temperatures of 110 °C.
5 - Polylactic acid or polylactide fibre gets dissolved in chlorinated solvents, hot benzene, tetrahydrofuran, and dioxane.
6 - The polylactide is a biodegradable fibre.
7 - It has low moisture regain 0.4 to 0.6 ℅ and high wicking property.
8 - Flammability of polylactic acid or polylactide is low and smoke generation is also very low when it burns.
9 - It has high resistance to ultra violet radiation.
10 - Due to low refraction index its colours look very rich.
11 - It has low specific gravity 1.25 grams / cc
12 - The glass transition temperature of polylactic acid ranges between 60°C - 65 °C.
13 - It has a crystallinity near about 37%.
14 - The melting point of polylactide fibre is 173°C -178 °C.
15 - tenacity of polylactide fibre is 32 - 36 cN / tex
• Various types of films.
• Sheet casting.
• Biodegradable cups.
• Tea or coffee bags are made of polylactide.
• It has very significant medical uses(screws,pin,rods and mesh) because it breaks down within the body within six months to two years.
• Apparel ,outdoor furniture and furnishings.• Disposable tableware.
• Food packaging.
• Feminine hygiene products, and diapers.
• Engineering plastics.
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