Degradable Crosslinking Agent for Fast Oxidative Polymer Breakdown
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Solution Overview
Problem
Existing degradable polymers cross-linked with hydrazine derivatives exhibit insufficient degradation rates when reacted with low concentrations of oxidizing agents.
Innovation Solution
A hydrazine derivative with a highly water-soluble structure is used to enhance degradation rates, generating water-soluble degradation products with a solubility of 30 g/L or more when reacted with oxidizing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polymers are cross-linked with hydrazine derivatives to achieve stability in air, then degradation rate with low concentrations of oxidizing agents is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the hydrazine derivative by introducing water-soluble groups (such as carboxyl, hydroxyl, or amino groups) and adjusting the ratio of hydrophilic to hydrophobic portions. This structural modification enables the cross-linked polymer to maintain air stability while significantly improving degradation rate with low concentrations of oxidizing agents, as the water-soluble groups facilitate better contact and reaction with oxidizing agents in the environment
2Productivity
If hydrazine derivative structure is modified to enhance degradation rate, then water solubility of degradation products must be 30 g/L or more
Solution Approach 1:
The invention applies local quality by introducing specific water-soluble functional groups (carboxyl, hydroxyl, or amino groups) at specific positions within the hydrazine derivative structure. These localized hydrophilic modifications ensure that degradation products achieve sufficient water solubility (30 g/L or more) while maintaining the overall cross-linking functionality and degradation rate enhancement
3Productivity
If cross-linking agent is designed for rapid degradation, then formability and durability of plastic products may be compromised
Solution Approach 1:
The invention creates a dynamic system where the cross-linked polymer maintains its stable structure under normal use conditions (resisting degradation) but transforms into a rapidly degradable state when exposed to oxidizing agents. The hydrazine derivative cross-links provide initial structural integrity and durability, while the incorporated water-soluble groups enable rapid degradation upon environmental trigger, achieving both durability and high degradation efficiency
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 degradable cross-linking agent achieves an improved degradation efficiency by producing predominantly water-soluble products, facilitating rapid and effective breakdown of cross-linked materials.
Implementation Method 1
These polymers have a diacyl hydrazine structure and are thus stable in the air, while they can be rapidly degraded when reacted with oxidizing agents such as sodium hypochlorite
Data Source
AI summary
The present invention aims to provide a degradable cross-linking agent with an excellent degradation rate. The present invention relates to a degradable cross-linking agent including a compound represented by the following formula (1), the degradable cross-linking agent, when subjected to a reaction with an oxidizing agent after cross-linking, generating at least one water-soluble degradation product including a Z-containing carboxylic acid, a Z-containing alcohol, a Z-containing amine, or a Z-containing thiol and having a water solubility of 30 g/L or more. In formula (1), - n ≥ 1, k ≥ 0, m ≥ 0, p1 ≥ 1, p2 ≥ 1, and p3 ≥ 1; - R1, R2, and R3 each independently represent a single bond or a C1-C500 hydrocarbon group optionally containing a substituent or a heteroatom; - Q1, Q2, and Q3 each independently represent at least one reactive functional group selected from the group consisting of a hydroxy group, an amino group, a thiol group, a hydrazide group, a carboxylic acid group, an acid anhydride group, a vinyl group, an allyl group, an acrylate group, a methacrylate group, a crotonate group, an isoprenyl group, an acrylamide group, a methacrylamide group, a crotonamide group, an epoxy group, an oxetane group, an oxazoline group, an isocyanate group, a carbodiimide group, a methylol group, a silanol group, a hydroxysilyl group, and an alkoxysilyl group; - each A independently represents a carbonyl group or a single bond; and - each Z independently represents a divalent or higher-valent group containing a siloxane structure or a C1-C500 hydrocarbon group optionally containing a heteroatom.