Multibranched Polyoxyalkylene Viscosity Reduction
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Solution Overview
Problem
Current polyoxyalkylene compounds with multibranched structures face challenges in achieving low viscosity in aqueous solutions and high purity production, particularly when used for modifying bio-related substances, due to issues like increased viscosity and formation of impurities during synthesis.
Innovation Solution
A multibranched polyoxyalkylene compound with a specific chemical structure and a production method involving etherification and functional group conversion, which forms a stable ether bond and minimizes impurity formation, allowing for effective modification of bio-related substances without steric hindrance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the molecular weight of the polyoxyalkylene compound is increased to enhance solubility and reduce toxicity, then the pharmacological effect is improved, but the viscosity increases making it difficult to handle
Solution Approach 1:
The polyoxyalkylene compound is divided into multiple branches (tetrabranched structure with 4-8 chains) radiating from a central core, segmenting the molecular weight distribution across multiple arms rather than a single linear chain, thereby reducing viscosity while maintaining high molecular weight for improved pharmacological effect
Solution Approach 2:
The compound combines a central core structure (multihydric alcohol or polyol) with multiple polyoxyalkylene chains of different lengths and compositions, creating a composite molecular architecture that optimizes both viscosity reduction and pharmacological activity
2Ease of operation
If a multibranched structure is introduced to reduce viscosity, then the handling ease is improved, but the synthesis complexity increases leading to impurity formation
Solution Approach 1:
The central core structure is pre-formed with multiple hydroxyl groups before initiating polyoxyalkylene chain growth, allowing all branches to develop simultaneously from a ready-made scaffold, thereby simplifying the overall synthesis process and reducing impurity formation
Solution Approach 2:
The central core structure serves multiple functions simultaneously: it provides the branching point for multiple chains, maintains structural stability, and enables controlled growth of all branches through its multiple equivalent hydroxyl groups, reducing synthesis complexity
3Shape
If triglyceryl monoallyl ether is used as a starting material for multibranched structure, then the multibranched structure is formed, but the allyl ether rearranges during polymerization resulting in decreased purity
Solution Approach 1:
The patent uses readily available multihydric alcohols (glycerin, xylitol, sorbitol) as central cores instead of specialized compounds like triglyceryl monoallyl ether, sacrificing the unique properties of the specialized starting material for the benefit of using stable, commercially available materials that do not undergo unwanted rearrangement reactions
Solution Approach 2:
The patent converts the potential harm of using complex starting materials into a benefit by deliberately selecting simpler, more stable multihydric alcohols that resist rearrangement, thereby turning what could be a purity problem into a solution that inherently maintains high purity
4Adaptability or versatility
If a dibranched structure is incorporated into the molecule to increase chain complexity, then the structural diversity is improved, but the viscosity in aqueous solution increases
Solution Approach 1:
The patent segments the molecular structure into a central core with multiple independently growing polyoxyalkylene chains, where each chain can have different degrees of polymerization and compositions, providing structural diversity while the radial arrangement prevents the viscosity increase associated with linear dibranched structures
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 solution improves the handling of polyoxyalkylene compounds in aqueous solutions, reducing viscosity and enhancing purity, enabling effective bonding with bio-related substances while maintaining functional integrity.
Implementation Method 1
forming a hydration layer through chemical modification with an amphiphatic polymer such as a sugar chain or polyethylene glycol
Implementation Method 2
two polyoxyalkylene chains form, together with glycerin, an ether bond which is hardly decomposed
Data Source
AI summary
A multibranched polyoxyalkylene compound represented by the following formula (1):wherein R1 is the same or different and is a hydrocarbon group having 1 to 24 carbon atoms, OA1 and OA2 are the same or different and are an oxyalkylene group having 2 to 4 carbon atoms, n and m are the same or different and are an average number of moles of the oxyalkylene group added, n represents 0 to 1000, m is the same or different and represents 10 to 1000, X represents a functional group capable of reacting with an amino group, a mercapto group, an aldehyde group, a carboxyl group, a triple bond, or an azide group to form a chemical bond, and L1 and L2 are the same or different and are a single bond, an alkylene group, or an alkylene group in which at least one bond selected from an ester bond, a urethane bond, an amide bond, an ether bond, and an amino is interposed.