Isohexide-Dioxalate Polymerization for Transparent Polyoxalates
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Solution Overview
Problem
Current methods for polymerization using isohexides result in dark tar-like materials due to limited reactivity and hydrogen bonding, and there is a need for a sustainable approach using renewable resources to produce degradable polymers.
Innovation Solution
The synthesis of isohexide-dioxalates and their polymerization with diols to form high molecular weight polyoxalates, using a process involving the addition of n-BuLi and alkyl chlorooxoacetate, followed by heating with a catalyst, to produce polymers suitable for films and composites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If isohexides are directly used in polymerization, then renewable resource utilization is improved, but polymer quality deteriorates (dark tar-like material)
Solution Approach 1:
The patent introduces isohexide-dioxalate as an intermediate compound that mediates between the renewable isohexide resource and the final polymer product. The dioxalate group acts as a reactive intermediary that enables controlled polymerization while preventing the formation of dark tar-like materials, thus maintaining both renewable resource utilization and polymer quality
Solution Approach 2:
The patent modifies the chemical parameters of isohexides by converting them into isohexide-dioxalate derivatives. This parameter change (adding the dioxalate functional group) fundamentally alters the polymerization behavior, transforming the outcome from dark tar-like material to high-quality transparent polymers while preserving the renewable origin
2Stability of the object's composition
If isohexides with endo-hydroxyl groups are used, then intramolecular hydrogen bonding is improved, but reactivity deteriorates
Solution Approach 1:
The patent extracts the hydroxyl groups from the isohexide structure and replaces them with dioxalate functional groups. This removal of the problematic endo-hydroxyl groups eliminates the intramolecular hydrogen bonding that causes low reactivity, while the dioxalate group provides new reactive sites for polymerization
Solution Approach 2:
The patent changes the functional group parameter from hydroxyl (-OH) to dioxalate ester. This parameter change fundamentally alters both the hydrogen bonding characteristics and reactivity, resolving the contradiction by eliminating the stabilizing hydrogen bonds while introducing highly reactive ester groups for polymerization
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
This approach yields high molecular weight polyoxalates with improved reactivity and degradability, enabling the production of transparent films and composites with enhanced mechanical properties, leveraging renewable feedstocks for a sustainable solution.
Implementation Method 1
adding n-BuLi to a solution of an isohexide in a solvent at temperature in the range of −78° C. to 40° C. to obtain a first reaction mixture
Implementation Method 2
adding a catalyst to a mixture of an isohexide-dioxalates of formula (I), a diol to obtain a reaction mixture and heating the reaction mixture
Implementation Method 3
heating the reaction mixture at temperature in the range of 120° C. or 150° C. for the period in the range 1 to 3 hrs
Data Source
AI summary
Embodiments of this disclosure are directed to isohexide-dioxalates compounds of formula (I), and polymerization processes that utilize diols, oxalic acid, and compounds according to formula (I):Embodiments of this disclosure also include polyoxalates compounds of formula (II), polymerization processes for the production of polymers having a general structure according to formula (II):