Acetylated Lactide Oligomer Plasticizer for PLA Flexibility

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Solution Overview

Problem

Polylactic acid (PLA) resin has limited flexibility and workability due to its high crystallinity and rigid molecular structure, making it unsuitable for applications requiring flexibility, such as films or packaging, and existing eco-friendly plasticizers lack sufficient mechanical properties and compatibility with PLA.

Innovation Solution

An acetylated lactide oligomer-based plasticizer is developed through ring-opening polymerization of lactide and an initiator, followed by acetylation, which enhances thermal stability and compatibility with PLA, improving its mechanical properties and flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PLA resin is used to provide biodegradability and environmental friendliness, then eco-friendly properties are improved, but flexibility and workability deteriorate due to high crystallinity and rigid molecular structure

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the chemical structure parameters of the plasticizer by introducing acetyl groups through acetylation reaction. This modifies the plasticizer's molecular weight, polarity, and intermolecular forces, enabling it to effectively plasticize PLA while maintaining biodegradability. The acetylated lactide oligomer achieves optimal balance between flexibility improvement and biodegradability preservation through controlled acetylation degree and oligomer chain length

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite system by combining PLA resin with acetylated lactide oligomer plasticizer. This composite approach allows the plasticizer to penetrate between PLA chains and reduce intermolecular forces without compromising the biodegradable nature of PLA. The composite material achieves synergistic effects where the plasticizer enhances flexibility while PLA maintains its biodegradability and mechanical strength

Inventive Principle:

Principle #40Composite materials

2Reliability

If existing eco-friendly plasticizers are added to improve flexibility, then environmental friendliness is maintained, but mechanical properties and compatibility with PLA deteriorate

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies local quality by designing a plasticizer with specific local molecular structures - acetylated lactide oligomers with controlled degrees of polymerization and acetylation. This local structural optimization ensures high compatibility with PLA at the molecular level, preventing phase separation and maintaining mechanical properties. The plasticizer's local chemical structure (acetyl groups) matches the polarity and functional groups of PLA, enhancing interfacial adhesion and stress transfer

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent systematically changes key parameters of the plasticizer including molecular weight distribution, acetylation degree, and oligomer chain length. These parameter optimizations are tailored to match PLA's molecular characteristics, ensuring maximum compatibility and mechanical property retention. The controlled parameter changes enable the plasticizer to reinforce rather than weaken the PLA matrix

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If a plasticizer is added to improve flexibility and workability, then ease of operation is improved, but thermal stability deteriorates

Engineering Contradiction:

ImproveworkabilityVSAvoidthermal stability

Core Design Contradiction:

Ease of operationVSTemperature

Solution Approach 1:

The patent changes the thermal parameters of the plasticizer through acetylation, which increases the glass transition temperature and decomposition temperature of the plasticizer. This parameter modification allows the plasticized PLA to maintain flexibility at processing temperatures while resisting thermal degradation. The acetyl groups restrict molecular motion and strengthen intermolecular interactions, enhancing thermal stability without sacrificing plasticizing effectiveness

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The acetylated lactide oligomer-based plasticizer significantly improves the thermal stability, plasticity, and compatibility of PLA resin, enabling the production of flexible products with enhanced tensile strength and elongation, while maintaining storage modulus, thus overcoming the limitations of existing plasticizers.

Implementation Method 1

synthesizing a lactide oligomer through ring-opening polymerization (ROP) of an initiator and lactide

Methodology Applied

Scientific EffectRing-opening polymerization:

Implementation Method 2

putting acetic anhydride into the lactide oligomer and performing acetylation

Methodology Applied

Scientific EffectAcetylation:

Data Source

PatentUS11332598B2Acetylated lactide oligomer-based plasticizer, method of preparing same and PLA resin composition containing same

Publication Date: 2022.05.17 KOREA RES INST OF CHEM TECH

AI summary

Disclosed herein is an acetylated lactide oligomer-based plasticizer and a method of preparing the same having improved thermal stability, enhanced plasticity and excellent compatibility with a resin, the method, including: (a) synthesizing a lactide oligomer through ring-opening polymerization (ROP) of an initiator and lactide; (b) putting acetic anhydride into the lactide oligomer and performing acetylation; and (c) removing acetic acid generated in step (b) and unreacted acetic anhydride.