Polyphenylene Sulfide Resin Terminal Group Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Unmodified polyphenylene sulfide resin exhibits brittleness, high cost, poor paintability, and thermal oxidation issues due to its rigid molecular chain and high melting point, limiting its applications and requiring modification with fillers to enhance performance.
Innovation Solution
A method for preparing polyphenylene sulfide resin using a hydroxyl-containing aromatic thiol compound and 4-thiophenol as terminal-group adjusting agents to control reactivity and melting crystallization temperature, resulting in a resin with improved thermal stability and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyphenylene sulfide is modified with inorganic fillers or organic fillers to improve strength and rigidity, then mechanical performance is enhanced, but processing complexity and cost increase
Solution Approach 1:
The patent extracts the essential modification function into a single component - the hydroxyl-containing aromatic thiol compound serves as a multifunctional additive that simultaneously provides reinforcement, controls crystallization, and maintains processability, eliminating the need for complex filler blends and surface treatment processes
Solution Approach 2:
The hydroxyl-containing aromatic thiol compound performs multiple functions: it acts as a reinforcing agent, a crystallization controller, and a processing aid, replacing the need for separate fillers, coupling agents, and processing additives that would otherwise be required to achieve similar performance
2Reliability
If polyphenylene sulfide is subjected to terminal-group adjusting reaction with hydroxyl-containing aromatic thiol compound and 4-thiophenol, then reactivity and thermal stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the terminal-group adjusting reaction with the main polycondensation reaction into a single integrated process, where the hydroxyl-containing aromatic thiol compound and 4-thiophenol are added during polycondensation, eliminating the need for separate post-polymerization modification steps
Solution Approach 2:
The terminal groups are adjusted during the polycondensation process itself rather than as a separate post-processing step, preparing the polymer with optimal reactivity and thermal stability before it is even completed, which simplifies downstream processing
3Temperature
If polyphenylene sulfide has high melting point to ensure thermal resistance, then heat resistance is improved, but fluidity during melting deteriorates due to thermal oxidation cross-linking
Solution Approach 1:
The hydroxyl-containing aromatic thiol compound acts as an intermediary that protects the polyphenylene sulfide chains during melting by preventing thermal oxidation cross-linking reactions, allowing the material to maintain high fluidity even at elevated temperatures required for processing
Solution Approach 2:
The patent changes the chemical parameters of the polyphenylene sulfide by introducing hydroxyl-containing aromatic thiol groups that alter the thermal behavior of the polymer, shifting the balance between thermal stability and melt fluidity to allow processing at temperatures that maintain both heat resistance and flowability
4Strength
If polyphenylene sulfide has rigid molecular chain to achieve high crystallinity and strength, then mechanical strength is improved, but brittleness increases and elongation decreases
Solution Approach 1:
The patent introduces local flexibility into the rigid polyphenylene sulfide structure by incorporating hydroxyl-containing aromatic thiol groups at specific locations along the polymer chain, creating zones of enhanced flexibility that allow chain movement and improve elongation while preserving overall structural strength
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 produces a polyphenylene sulfide resin with high reactivity, controlled melting crystallization temperature, and enhanced thermal stability, suitable for various applications including injection molding and extrusion, with improved mechanical properties and reduced chlorine content.
Implementation Method 1
a hydroxyl-containing aromatic thiol compound and 4-thiophenol are used as terminal-group adjusting agents to perform a terminal-group adjusting reaction
Implementation Method 2
polyphenylene sulfide is susceptible to thermal oxidation cross-linking reaction with oxygen in the air, resulting in reduced fluidity
Data Source
AI summary
The disclosure relates to a preparation method of a polyphenylene sulfide resin, and a polyphenylene sulfide resin prepared by the method. The disclosure uses a sulfur-containing compound, an alkaline substance and p-dichlorobenzene as raw materials, a fatty acid as a polycondensation aid to carry out a polycondensation reaction. After purification treatment, a primary polyphenylene sulfide is obtained, which then reacts with a terminal-group adjusting agent at a high temperature to generate the polyphenylene sulfide resin. The preparation method of the disclosure has high yield and low cost, and the prepared polyphenylene sulfide resin has high reactivity, high melting crystallization temperature and excellent thermal stability. The polyphenylene sulfide resin of the disclosure can be directly used for extrusion and injection molding, and is especially applicable to fields such as automobile parts, electronic / electrical equipment, chemical industry, and machinery industry.