Crosslinked Polyarylene Sulfide Composition Impact Modifier Compatibility
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Solution Overview
Problem
Polyphenylene sulfide (PPS) is brittle, limiting its impact strength, and existing blends with impact modifiers often suffer from incompatibility issues, especially at varying temperatures, necessitating a composition with improved mechanical and thermal properties across a wide temperature range.
Innovation Solution
A crosslinked polymer composition comprising 50-90 wt.% polyarylene sulfide, 0.5-50 parts of epoxy-functional impact modifier per 100 parts of polyarylene sulfide, and 0.1-15 parts of a crosslinking system including a metal carboxylate, which enhances compatibility and distribution of impact modifier, leading to improved mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PPS is blended with impact modifiers to improve impact strength, then impact strength is improved, but compatibility between impact modifiers and PPS deteriorates
Solution Approach 1:
A compatibilizer comprising a polyarylene sulfide block and a polyolefin block is introduced as an intermediary between the PPS matrix and the impact modifier. The polyarylene sulfide block is compatible with the PPS matrix while the polyolefin block is compatible with the impact modifier, thereby mediating the interface between the two incompatible phases and improving overall compatibility and impact strength.
Solution Approach 2:
The invention creates a composite material system consisting of three components: PPS matrix, impact modifier, and compatibilizer. This composite structure allows the combination of materials with different properties (rigid PPS and flexible impact modifier) while using the compatibilizer to ensure proper interfacial adhesion and distribution, resolving the compatibility issue.
2Stability of the object's composition
If compatibilizers are used to improve blend compatibility, then compatibility is improved, but performance at high or low temperatures deteriorates
Solution Approach 1:
The compatibilizer is designed with specific parameter ranges: the polyarylene sulfide block has a weight average molecular weight of 10,000-100,000, the polyolefin block has a weight average molecular weight of 1,000-50,000, and the polyolefin content is 20-80 wt%. These optimized parameters ensure the compatibilizer maintains effectiveness across a wide temperature range while improving compatibility.
Solution Approach 2:
The compatibilizer ensures homogeneous distribution and compatibility between PPS and impact modifier across different temperature conditions. The specific molecular weight ranges and composition ratios create a uniform interface that maintains blend stability whether at high or low temperatures, eliminating the temperature-dependent performance issues of conventional compatibilizers.
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 composition exhibits excellent strength, flexibility, and thermal resistance, with notched Charpy impact strength of 10 kJ/m² or more at 23°C and 2 kJ/m² or more at -30°C, along with tensile properties such as 25 MPa or more tensile break stress and 40% or more tensile strain at break.
Implementation Method 1
a crosslinking system; wherein the crosslinking system includes a metal carboxylate
Data Source
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AI summary
A polymer composition that can exhibit excellent strength and flexibility under a variety of different conditions is provided. More particularly, the polymer composition contains a polyarylene sulfide, epoxy-functional polymeric impact modifier, and a crosslinking system that includes a metal carboxylate. In certain cases, the crosslinking system may also employ a crosslinking agent that is "multi-functional" to the extent that it contains at least two reactive, functional groups.