Bio-based Pre-polymers for PLA Toughening and Compatibilization
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Solution Overview
Problem
Poly(lactic acid) (PLA) exhibits low elongation at break and brittleness due to its mechanical properties, and incorporating traditional flexible polymers into its matrix leads to incompatibility and phase segregation issues, while existing flexible polymers are often derived from petrochemicals.
Innovation Solution
Development of novel bio-based pre-polymers for the synthesis of polyurethanes, polyesters, and polyamides that can enhance shock reinforcement and nanostructuring of PLA matrices without the drawbacks of traditional polymers, using specific compounds with defined repeating units and structures that promote compatibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional flexible polymers (polybutadiene, poly(propylene oxide), poly(ε-caprolactone)) are incorporated into PLA matrix, then shock reinforcement is improved, but compatibility deteriorates leading to phase segregation
Solution Approach 1:
The patent uses a compatibilizer (block copolymer or graft copolymer containing both PLA and flexible polymer segments) as an intermediary substance between the PLA matrix and flexible polymer domains. This compatibilizer reduces interfacial tension and improves adhesion between the immiscible phases, preventing macroscopic phase segregation while maintaining the shock reinforcement benefits of the flexible polymer domains.
Solution Approach 2:
The patent creates a composite material system consisting of PLA matrix, flexible polymer domains (as impact modifiers), and compatibilizer. This multi-component composite structure allows the combination of rigid PLA providing structural integrity and flexible polymer providing shock resistance, while the compatibilizer ensures homogeneous distribution and prevents phase separation.
2Strength
If petrochemical-based flexible polymers are used to enhance PLA properties, then mechanical performance is improved, but environmental sustainability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter of the flexible polymer from petrochemical-based (e.g., polybutadiene from butylene) to bio-based alternatives (e.g., poly(ricinoleic acid) from castor oil, polyhydroxyalkanoates from microbial fermentation). This parameter change maintains the flexible polymer's mechanical function while improving environmental sustainability and reducing petrochemical dependency.
Solution Approach 2:
The patent utilizes renewable biological resources (castor oil, microbial cultures) that can self-replenish through agricultural and biological processes, replacing depleting petrochemical resources. The bio-based flexible polymers are produced through natural biological pathways (oil extraction from castor plants, microbial polymer synthesis), creating a self-sustaining material supply chain.
Data Source
AI summary
The present invention relates to the use of a compound having the following formula (I):in which:A1 represents a divalent alkylene radical comprising from 2 to 20 carbon atoms;A2 represents a divalent alkylene radical comprising from 2 to 20 carbon atoms;A3 is selected from the group consisting of the following divalent radicals:an alkylene comprising from 2 to 600; andan arylene comprising from 6 to 30 carbon atoms;X1, X3 and X4 represent —O— or —NH—;X′2 is selected from the group consisting of: —S—, —CH2— and a bond; andn and m represent an integer ranging from 1 to 1000;for the preparation of additives in a matrix of polyester, polyvinyl chloride, polyurethane, polyamide, poly(alkyl acrylate), poly(alkyl methacrylate), polystyrene or polyolefin.