01 Analysis of Core Challenges in Polymer Durability

1. Definition of durability: The ability of a material to maintain its mechanical strength, chemical stability, and functional integrity under specific environmental conditions and over its service life.

2. Aging failure mechanisms: Polylactic acid ( PLA ) Material property degradation arises from the synergistic interaction of two driving factors:

▲ Intrinsic genetic defect

• Highly reactive carboxyl groups at the ends of the molecular chains ( -COOH ) and hydroxyl ( -OH ) Triggering a cascade of hydrolysis reactions
• Synthetic residual impurities (such as lactide monomers and catalysts) give rise to hydrophilic microdomains.

▲ External environmental stress

• Thermal stress–induced molecular chain scission
• Oxygen / Water‑induced synergistic erosion accelerates the cleavage of ester bonds.

▲ Figure 1 Polylactic acid structure

 

02 Molecular Engineering Reconfiguration: A Breakthrough in End-Group Stability Technology

Technological breakthroughs

▲ Figure 2  Molecular structure design with a terminal group structure

1 Innovative Solutions: End-Group Passivation and Hydrophobic Technology

Introducing reactive substances bearing hydrophobic groups, on the one hand, precisely passivates terminal hydroxyl and carboxyl groups, thereby enhancing… PLA Water resistance and thermal stability; on the other hand, it enhances the material’s hydrophobic properties.

2 Impurity Full-Cycle Control System: Triple Purification Mechanism

• Source-level purification: A specialized lactide purification process can achieve high chemical purity of lactide. ≥99.5% , reduction in mixed acids 65% , thereby avoiding the introduction of additional impurities during the polymerization process and reducing the dosage of polymerization aids such as catalysts. 45%；
• Process Optimization: Controlled polymerization and specialized equipment systems enhance the conversion rate and purification efficiency of lactide polymerization, reducing monomer residues. 37%；
• Terminal Sealing: Develop a composite catalyst deactivator to suppress the residual catalytic activity in polyester.

 

03  PLA Verification of a Leap in Durability Performance

Sour Value

▲   Figure 3  PLA Comparison of acid values

 

Thermal and oxidative stability

▲ Figure 4 240℃ Oven placement 1H after Mw Comparison

 

95℃ Boiled

▲ Figure 5 95℃ Boil in water 2/4H Post-melt index change

 

Natural placement

▲ Figure 6 Natural placement 1/2/7/28D Melt index change after