Biodegradable three-dimensional network structure
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Solution Overview
Problem
Existing biodegradable network structures lack both excellent compression durability and high compression recovery after heat compression.
Innovation Solution
A biodegradable three-dimensional network structure composed of polybutylene adipate terephthalate resin fibers with specific molecular weight, density, thickness, and crystalline melting enthalpy, featuring a three-dimensional random looped shape and hollow cross-section, enhances compression durability and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crosslinking agents are used to improve the mechanical strength of biodegradable polymers, then the polymer becomes too rigid and loses its elasticity
Solution Approach 1:
The patent changes the chemical parameters of crosslinking by using genipin instead of traditional crosslinking agents, controlling the crosslinking degree and network density to achieve optimal balance between strength and elasticity. The crosslinking density is adjusted through concentration and reaction conditions to prevent excessive rigidity while maintaining mechanical strength.
Solution Approach 2:
The patent creates a composite structure by combining biodegradable polymer chains with genipin crosslinking agents to form a three-dimensional network. This composite approach integrates the biodegradability of natural polymers with the structural integrity provided by controlled crosslinking, achieving both strength and flexibility.
2Strength
If the polymer network is made more dense to improve mechanical properties, then the material becomes less biodegradable
Solution Approach 1:
The patent optimizes the crosslinking parameters to achieve a balanced network density that maintains mechanical strength while preserving biodegradability. By controlling crosslinking concentration and using biocompatible genipin crosslinking agents, the material achieves optimal balance between structural integrity and degradation capability.
Solution Approach 2:
The patent creates a three-dimensional network structure with controlled porosity that allows degradation products to diffuse out while maintaining mechanical strength. The network architecture provides pathways for enzymatic attack and product release, ensuring biodegradability even with crosslinking present.
3Productivity
If traditional crosslinking agents are used to achieve rapid crosslinking, then the crosslinking process is fast but the mechanical strength is insufficient
Solution Approach 1:
The patent uses genipin as a biodegradable crosslinking agent that provides sufficient crosslinking strength for temporary applications. The crosslinked structure maintains mechanical strength during the required period and then degrades naturally, eliminating the need for permanent strong crosslinking agents.
Solution Approach 2:
The patent optimizes crosslinking reaction parameters including genipin concentration, pH, and temperature to achieve rapid crosslinking with adequate mechanical strength. The crosslinking degree is controlled to match the specific application requirements rather than maximizing strength indefinitely.
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 structure provides improved compression durability and high compression recovery, suitable for applications requiring cushioning and impact absorption.
Implementation Method 1
crosslinking agents such as genipin have been used to crosslink the polymer chains
Implementation Method 2
The polymers and their degradation products are eliminated from the body through hydrolysis and enzymatic breakdown
Data Source
Figure 1
AI summary
An object of the present invention is to provide a biodegradable three-dimensional network structure having excellent compression durability and high compression recovery after heat compression. The biodegradable three-dimensional network structure includes a linear fiber including a polybutylene adipate terephthalate resin having a weight average molecular weight of 35000 or more, wherein the biodegradable three-dimensional network structure has an apparent density of from 0.005 g/cm3 to 0.30 g/cm3 and a thickness of from 10 mm to 100 mm, and the linear fiber has a fiber diameter of from 0.2 mm to 2.0 mm and a crystalline melting enthalpy of 16 J/g or more.