Biodegradable Polymer Brittleness via Small Molecule Diffusion
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Solution Overview
Problem
Existing methods for modifying the mechanical properties of biodegradable polymers, such as blending or copolymerization, are costly, time-consuming, and often result in increased brittleness due to higher crystallinity, which is undesirable for medical devices like sutures and stents.
Innovation Solution
Incorporating a small molecule organic compound with a molecular weight of 100-1000 Daltons and low vapor pressure into biodegradable polymers to diffuse into the amorphous region, reducing brittleness and enhancing mechanical properties like elongation at break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crystallinity of biodegradable polymer is increased to improve strength and stiffness, then the mechanical strength is improved, but the polymer becomes more brittle and less flexible
Solution Approach 1:
The patent changes the physical-chemical parameters of the polymer by incorporating small molecule organic compounds with specific molecular weights (100-1000 Daltons) and low vapor pressures. These compounds diffuse into the crystalline regions and modify the intermolecular forces, allowing the polymer to maintain high crystallinity (40-80%) while reducing brittleness and improving elongation at break from typically <10% to >20%.
Solution Approach 2:
The patent creates a composite system by combining biodegradable polymer with small molecule organic compounds. The small molecules act as additives that modify the polymer matrix properties, creating a composite material that exhibits both high strength (from crystalline structure) and improved flexibility (from small molecule intervention in intermolecular interactions).
2Strength
If traditional methods such as blending or copolymerization are used to modify mechanical properties, then the mechanical properties can be improved, but the process becomes costly and time-consuming
Solution Approach 1:
The patent employs small molecule organic compounds that are simple, inexpensive, and easy to handle compared to complex polymer synthesis procedures. These small molecules can be introduced through straightforward processing methods such as melt blending or solution casting, avoiding the need for expensive copolymerization equipment and lengthy synthesis procedures while achieving comparable or superior mechanical property modifications.
3Reliability
If small molecule organic compound is diffused into the polymer to reduce brittleness, then the elongation at break is improved, but the crystalline structure may be disrupted
Solution Approach 1:
The small molecule organic compounds are strategically positioned at specific locations within the polymer structure, particularly at the boundaries between crystalline and amorphous regions. This localized placement allows the small molecules to modify intermolecular forces and improve chain mobility in critical areas without disrupting the overall crystalline structure, thereby maintaining both structural integrity and improved elongation properties.
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 method significantly improves the mechanical properties of biodegradable medical devices by reducing brittleness and maintaining the integrity of the crystalline regions, making them less prone to breakage while maintaining strength.
Implementation Method 1
a small molecule organic compound which diffuses into the biodegradable polymer
Data Source
AI summary
A medical polymer device comprising a biodegradable polymer is provided, wherein the biodegradable polymer has a crystallinity of about 10% to about 80%, and preferably from about 20% to about 60%, wherein the medical polymer device comprises a small molecule organic compound which diffuses into the biodegradable polymer, the small molecule organic compound has a molecular weight of from about 100 to about 1000 Daltons, preferably from about 150 to about 500 Daltons, and more preferably from about 150 to about 250 Daltons, and the small molecule organic compound is non-evaporating or low-evaporating. The present invention also provides a method for preparing a medical polymer device according to the present invention as well as a method for modifying a medical polymer device made from a biodegradable polymer.