Polylactic acid-starch blend
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Generally, starch can achieve maximum filling efficiency through plasticization (using glycerin, water, etc.). Are there any other methods? ? How can polylactic acid be used for film blowing without adding other toughening materials? .
Modification, by adding some macromolecular film-forming substances
Target market: biodegradable plastics; the lower the cost, the better. Can it still be degraded with a macromolecular membrane added? ? ? It is intended for injection molding and film blowing. .
At present, polylactic acid is affected by the quality of the raw material L-lactic acid; it can only be produced through ring-opening polymerization after the formation of lactide (a two-step process). An improved one-step method requires very high quality of the raw material, with an optical purity of over 99.5%, and it is still in the laboratory stage at present. Due to differences in manufacturing processes and the L-lactic acid raw material, the quality of polylactic acid is also divided into three grades: the lower-grade version is used to produce plastic substitutes such as cups and meal containers, the higher-quality version is used for making films, and the highest-grade version is used to spin fibers. The quality of polylactic acid is determined by its molecular weight; those with a lower molecular weight are of lower quality, while those with a higher molecular weight are of higher quality. The key to polylactic acid production lies in obtaining a stable and uniform high molecular weight.
The modification of actual PLA polymers follows the same principles as those applied to most plastics, with the need to take into account PLA’s specific basic properties.
What should be considered when blending polylactic acid with starch?
Is there any information on how appropriate modification is achieved?
Monitoring. Is it because the production cost of polylactic acid is too high that there is very little actual industrial use of it at present?
PLA is relatively brittle, so it needs to be modified to improve its flexibility and impact resistance, among other properties. For example: adding OAL, PEG, glycerol, etc.