Biodegradable Polymer Hydrophobicity via Oligosaccharide Crosslinking
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Solution Overview
Problem
Biodegradable polymers tend to absorb significant amounts of water, limiting their applications due to hydrophilic characteristics, which affects their durability and suitability for use in products that come into contact with water or moisture, and existing additives either provide limited benefits or compromise biodegradability.
Innovation Solution
Incorporating polyisobutylene, hydroxymethylfural, or 2,5-dimethylfuran into biodegradable polymers through crosslinking with oligosaccharides at specific pH and temperature conditions to enhance hydrophobicity, along with using appropriate solvents and additional additives like gallic acid or fluoropolymers, to create crosslinked polymeric mixtures with improved water-repelling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biodegradable polymers are used, then environmental degradability is improved, but water absorption increases
Solution Approach 1:
The patent combines biodegradable polymers with hydrophobic additives (waxes, oils, fats, or their derivatives) to create a composite material that maintains biodegradability while reducing water absorption. The hydrophobic substance forms a water-repellent layer within or on the polymer matrix, creating a dual-function material that addresses both environmental concerns and water resistance requirements.
Solution Approach 2:
The patent modifies the chemical and physical parameters of biodegradable polymers by incorporating hydrophobic substances, changing the overall hydrophilicity parameter of the material. This parameter change allows the polymer to maintain its biodegradable nature while acquiring water-repellent properties through the altered surface and bulk characteristics.
2Quantity of substance
If hydrophobic additives are added to decrease water absorption, then water resistance is improved, but biodegradability may be compromised
Solution Approach 1:
The patent carefully controls the type, amount, and properties of hydrophobic additives to achieve the desired water resistance while maintaining biodegradability. By selecting specific hydrophobic substances (natural waxes, plant oils, animal fats) and optimizing their concentration, the patent modifies the hydrophobicity parameter without completely blocking biodegradation pathways.
Solution Approach 2:
The hydrophobic substance is applied locally or in a controlled distribution within the polymer matrix, creating zones of varying hydrophobicity. This local quality approach allows the material to exhibit water resistance at the surface or interface while maintaining biodegradability in the bulk material where microorganisms can still access and decompose the polymer chains.
3Quantity of substance
If existing water-absorption decreasing additives are used, then water resistance is improved slightly, but added value is limited and biodegradability is negatively contributed
Solution Approach 1:
The patent employs a range of hydrophobic additives with varying degrees of hydrophobicity, molecular weights, and chemical structures to achieve different levels of water resistance. This parameter variation allows tailoring the material properties to suit specific applications, from light moisture protection to complete water resistance, thereby expanding the versatility and application range of biodegradable polymers.
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 approach significantly increases the hydrophobicity of biodegradable polymers, enhancing their durability and expanding their application range while maintaining biodegradability and providing fire retardation characteristics.
Implementation Method 1
crosslinking said polymeric mixture in the presence of one or more lower oligosaccharides, preferably di- or trisaccharides, at a pH between 1.5 and 6 and a temperature of 60°C to 160°C thereby providing a crosslinked polymeric mixture
Implementation Method 2
The present inventor has surprisingly found that incorporating, as additives, polyisobutylene with the formula (C 4 H 8 )n and/or HMF (hydroxymethylfural with the formula C 6 H 6 O 3 ) and/or DMF (2,5-Dimethylfuran with the formula (CH 3 ) 2 C 4 H 2 O), into polymers, for example by adding or coating, significantly increases the hydrophobicity, or decreases the hydrophylicity, of these polymers
Data Source
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AI summary
The present invention relates to hydrophobic, or water resistant or water repellant, polymers and especially to hydrophobic, or water resistant or water repellant, biodegradable polymers. Preferred polymers according to the present invention are polymers based on polylactic acid, polyvinyl, starch, polyacrylic acid, polyester and polymers based on combinations thereof. Further, the present invention relates to novel additives and techniques to provide polymers, and especially biodegradable polymers, with improved hydrophobic, water-repellent or water resistant properties.