Crosslinked PAS Resin Composition Reducing Tackiness and Gas
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polyarylene sulfide (PAS) resin compositions face challenges in achieving high mechanical strength and toughness while maintaining processability, particularly in preventing tackiness and reducing gas generation during molding.
Innovation Solution
A PAS resin composition is developed by combining a crosslinked PAS resin with a thermoplastic elastomer and/or a silane coupling agent in specific ratios, which enhances toughness and processability while minimizing tackiness and gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large amount of elastomer is mixed to achieve high toughness in unreinforced PAS resin composition, then toughness is improved, but heat resistance deteriorates and decomposed gas increases leading to poor processability
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific crosslinking agents (compounds with formula (1) containing reactive functional groups) into the PAS resin system. This crosslinking modifies the molecular structure to achieve toughness enhancement through controlled crosslink density rather than relying on large amounts of elastomer, thereby maintaining heat resistance and reducing decomposed gas generation during molding
Solution Approach 2:
The patent creates a composite material system by combining PAS resin with crosslinking agents and optionally with reinforcing fillers or other polymers in specific ratios. This composite approach allows the crosslinked PAS resin matrix to provide both toughness and heat resistance simultaneously, while the controlled composition minimizes decomposed gas generation during the molding process
2Strength
If the degree of crosslinking of PAS resin is increased to enhance toughness, then toughness is improved, but radical amount increases causing resin retention and increased tackiness
Solution Approach 1:
The patent optimizes the crosslinking degree by controlling the type and amount of crosslinking agents used. By selecting specific crosslinking agents with appropriate reactive groups and controlling their concentration within optimal ranges, the patent achieves sufficient toughness while minimizing excessive crosslinking that would generate radicals and cause tackiness. The crosslink density is carefully balanced to prevent resin retention issues
Solution Approach 2:
The patent introduces crosslinking agents as intermediary substances that mediate between the PAS resin molecules to form a crosslinked network. These crosslinking agents act as bridges that provide toughness enhancement without requiring direct radical reactions between PAS chains, thereby reducing the radical amount generated and minimizing tackiness and resin retention problems
3Reliability
If reinforcing material is added to prevent detachment in wet environment, then reliability is improved, but viscosity increases and toughness deteriorates
Solution Approach 1:
The patent replaces permanent reinforcing materials like glass fibers with a molecular-level crosslinking structure that provides equivalent or superior performance without the drawbacks. The crosslinked PAS resin achieves reliability in wet environments through its chemically crosslinked network that prevents molecular detachment, eliminating the need for reinforcing materials that would increase viscosity and potentially detach
Solution Approach 2:
The patent substitutes the mechanical reinforcement approach (adding glass fibers or other particulate reinforcements) with a chemical reinforcement approach (crosslinking the PAS resin molecules). This substitution eliminates the need for discrete reinforcing materials while achieving enhanced reliability in wet environments, and avoids the viscosity increase and toughness deterioration associated with mechanical reinforcement
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 resulting PAS molded articles exhibit excellent mechanical strength and toughness, along with improved processability, reduced tackiness, and minimized gas generation, making them suitable for applications in wet environments.
Implementation Method 1
when the degree of crosslinking of a PAS resin is increased for enhancing the toughness
Implementation Method 2
the measurement of dynamic viscoelasticity, the amount of the thermoplastic elastomer (B) mixed is 12 parts by mass or less relative to 100 parts by mass of the PAS resin (A)
Data Source
AI summary
Provided is a PAS molded article in which an increase in tackiness due to retention is suppressed and generated gas is reduced. Specifically, provided are a PAS resin composition obtained by mixing a PAS resin with a thermoplastic elastomer and/or a silane coupling agent, wherein the PAS resin is a crosslinked PAS resin, and has a region where tan δ at 280° C. to 330° C. is less than 1 at an angular frequency 1/s in the measurement of dynamic viscoelasticity, the amount of the thermoplastic elastomer mixed is 12 parts by mass or less relative to 100 parts by mass of the PAS resin, and/or the amount of the silane coupling agent mixed is 1.0 part by mass or less relative to 100 parts by mass of the PAS resin, and the viscosity change rate is 150% or less, a molded article, and methods for producing these.