P(3HB-co-3HHx) Copolymer Composition for High Melt Fluidity
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Solution Overview
Problem
Copolymers of 3-hydroxybutanoate and 3-hydroxyhexanoate (P(3HB-co-3HHx) exhibit low fluidity when melted, leading to poor processability and limited practical application.
Innovation Solution
Producing polyhydroxyalkanoate with increased 3-hydroxyhexanoate content using microorganisms, specifically Cupriavidus necator engineered with polyhydroxyalkanoate synthase gene, to achieve high melt fluidity and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If copolymer of 3-hydroxybutanoate and 3-hydroxyhexanoate is produced with increased 3-hydroxyhexanoate content to improve physical properties, then melt fluidity and processability are enhanced, but the polymer composition control becomes more difficult
Solution Approach 1:
The patent applies parameter changes by modifying the polyhydroxyalkanoate synthase enzyme through site-directed mutagenesis to alter its substrate specificity and co-substrate utilization. Specifically, mutations were introduced at positions 24, 25, and 26 of the enzyme to enhance its ability to incorporate 3-hydroxyhexanoate units while maintaining control over the copolymer composition and microstructure.
2Ease of manufacture
If conventional copolymer production methods are used, then production costs are reduced, but melt fluidity remains low and processability is poor
Solution Approach 1:
The patent replaces conventional mechanical mixing and chemical catalyst systems with a biocatalytic approach using engineered polyhydroxyalkanoate synthase enzyme. This enzymatic system operates under milder conditions and provides superior control over copolymer composition, resulting in enhanced melt fluidity and processability without requiring complex reaction conditions or extensive purification steps.
3Object-affected harmful factors
If poly-3-hydroxybutanoate is produced to achieve biodegradability, then environmental compatibility is improved, but physical properties such as brittleness and hardness worsen
Solution Approach 1:
The patent creates a composite polymer structure by incorporating both 3-hydroxybutanoate units and 3-hydroxyhexanoate units into a single copolymer chain. The 3-hydroxybutanoate units provide biodegradability and biological compatibility, while the 3-hydroxyhexanoate units contribute to improved mechanical strength and reduced brittleness, achieving a synergistic effect that combines the advantages of both monomers.
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 resulting polyhydroxyalkanoate exhibits excellent melt fluidity, biodegradability, and heat resistance, suitable for resin molding and reducing marine pollution by enabling biodegradation of waste.
Implementation Method 1
a polyhydroxyalkanoate comprising a 3-hydroxybutanoate unit and a 3-hydroxyhexanoate unit
Implementation Method 2
it has been reported that the only biopolymers that can be actually said to be 'biodegradable' even in a marine environment are PHA and cellulose
Data Source
AI summary
It is an object of the present invention to provide a polyhydroxyalkanoate P(3HB-co-3HHx) comprising 3-hydroxybutanoate and 3-hydroxyhexanoate, the polyhydroxyalkanoate having high melt fluidity and excellent processability.In order to solve the problems described above, the inventors of the present invention found that with regard to a polyhydroxyalkanoate comprising 3-hydroxybutanoate and 3-hydroxyhexanoate, when the polyhydroxyalkanoate is produced by using microorganisms, and thereby the content of 3-hydroxyhexanoate is increased, a polyhydroxyalkanoate having novel physical properties is obtained. That is, the present invention provides the following polyhydroxyalkanoate, a molded body thereof, and a method for producing the polyhydroxyalkanoate. The polyhydroxyalkanoate of the present invention is a polyhydroxyalkanoate comprising a 3-hydroxybutanoate unit and a 3-hydroxyhexanoate unit, the polyhydroxyalkanoate having a melt flow rate at 160° C. and 2.16 kg/f of 2.5 g/10 minutes or more.