Aliphatic Polyesteramide Composite for Biodegradable Plastics
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Solution Overview
Problem
Current environmentally degradable plastics made from renewable resources often lack mechanical strength and durability, and are either expensive or unsuitable for a wide range of environmental conditions, while existing composites with improved properties are costly and limited in application.
Innovation Solution
A composite material produced using a moderately cross-linked aliphatic polyesteramide with random blocks, combined with renewable raw materials and additives, which provides enhanced mechanical properties and degradability, suitable for industrial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If natural polymer materials (starch, cellulose, lignin) are used alone to produce biodegradable materials, then the materials are cheap and renewable, but the service performance and mechanical properties are poor
Solution Approach 1:
The patent combines natural polymer materials (starch, cellulose, or lignin) with aliphatic polyesteramide to create a composite material. This composite structure allows the material to achieve good mechanical properties from the polyesteramide component while maintaining biodegradability and low cost from the natural polymer component. The composite resolves the contradiction by integrating the strengths of both material types.
Solution Approach 2:
The patent optimizes the weight ratio parameters of the composite components (natural polymer 20-70 parts, polyesteramide 30-80 parts) to achieve the desired balance between mechanical properties and cost. By adjusting these compositional parameters, the material can be tailored to meet specific performance requirements while controlling manufacturing costs.
2Strength
If aliphatic polyester is used to improve melting point and mechanical properties, then the service performance is excellent, but the compatibility with natural polymers is poor and properties are unstable
Solution Approach 1:
The patent changes the chemical structure parameter of the polyester from conventional aliphatic polyester to aliphatic polyesteramide. This structural modification introduces amide groups that enhance compatibility with natural polymers through hydrogen bonding, while maintaining good mechanical properties. The polyesteramide structure with controlled degree of polymerization (less than 20 for polyamide block) ensures both stability and biodegradability.
Solution Approach 2:
The aliphatic polyesteramide acts as an intermediary material that bridges the compatibility gap between natural polymers and synthetic polyesters. The amphiphilic nature of polyesteramide (containing both ester and amide groups) allows it to interact favorably with both hydrophobic polyester chains and hydrophilic natural polymer surfaces, stabilizing the composite structure.
3Reliability
If polycaprolactone is used to produce biodegradable composites, then the material is biodegradable, but the melting point is merely 60°C limiting use to 0-50°C environments
Solution Approach 1:
The patent changes the melting point parameter by replacing polycaprolactone with aliphatic polyesteramide having a higher melting point of 120-180°C. This parameter change expands the service temperature range to -40-80°C while maintaining biodegradability, as the polyesteramide is designed with hydrolyzable ester bonds that allow environmental degradation.
4Reliability
If polyesteramide with degree of polymerization less than 20 is used, then complete environmental degradation is achieved, but the mechanical strength may be reduced
Solution Approach 1:
The patent optimizes the degree of polymerization parameter of the polyesteramide to less than 20, which ensures complete biodegradation in the environment. To compensate for the reduced chain length and maintain mechanical strength, the patent uses the polyesteramide in a composite structure with natural polymers and optimizes the cross-linking degree (5-50%) to enhance structural integrity while preserving degradability.
Data Source
AI summary
An environmentally degradable composite having between 20 and 80 weight parts of a moderately cross-linked copolymer of aliphatic polyesteramide comprising random blocks, between 10 and 70 weight parts of a renewable raw material, between 5 and 20 weight parts of an additive, and between 0 and 30 weight parts of a filler. The composite has good mechanical properties, with a tensile strength of between 15 and 30 MPa, elongation at break of between 300 and 1000%, bending strength of between 10 and 25 MPa, and notched impact strength of between 20 and 90 kJ/m2. The composite has good environmental degradability and after 12 weeks' composting, the biodegradation rate thereof exceeds 90%. The composite has good formation performance, and can be processed using conventional plastics processing equipment by extruding, injection molding, blow molding, and hot pressing for preparation of a variety of products.