Swollen Polymer Cross-Link Density Measurement Apparatus
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Solution Overview
Problem
Current methods for determining the structural integrity of composite structures, such as polymer-based composites, are complex and time-consuming, particularly in measuring polymer/plasticizer interaction parameters, which is crucial for formulating and designing chemical propulsion systems.
Innovation Solution
A novel apparatus that characterizes the structural/mechanical behavior of swollen neat and/or filled thermosetting polymeric materials by determining the equilibrium modulus of a solvent-swollen polymeric tensile specimen, allowing for precise analysis of cross-link density at low levels of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional techniques are used to measure polymer/plasticizer interaction parameters, then the integrity of composite structure can be determined, but the measurement process becomes complex and very time consuming
Solution Approach 1:
The invention extracts the polymer matrix from the composite structure by dissolving the filler particles using a solvent. This separation allows direct measurement of polymer/plasticizer interaction parameters without the complexity of measuring intact composite structures, significantly reducing measurement time while maintaining accuracy
Solution Approach 2:
A solvent is introduced as an intermediary substance to dissolve the filler particles and separate the polymer matrix. This intermediary enables indirect measurement of composite integrity by measuring the extracted polymer's interaction parameters, which correlate to the original composite's integrity
2Strength
If polymer-based composites are used in chemical propulsion systems, then the structural strength is adequate to perform the required mission, but the variability in polymers necessitates a new analysis apparatus to understand structure-property relationships
Solution Approach 1:
The apparatus allows the polymer sample to serve itself by automatically swelling in the solvent and reaching equilibrium. The polymer's own physical chemistry properties (swelling behavior) provide the measurement signal, eliminating the need for complex external measurement systems while maintaining accuracy for assessing 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
Enables accurate and efficient determination of cross-link density in swollen polymers, facilitating a fundamental understanding of structure-property relationships, thereby improving the design and formulation of composite structures for chemical propulsion systems.
Implementation Method 1
a polymer specimen is swollen in a fluid within the fluid-holding structure
Implementation Method 2
a tensile force is exerted on the specimen. The tensile force is represented as a weight by the weight scale and the distance traversed by the multi-stage device is measured by the displacement gauge
Data Source
AI summary
An apparatus to determine the swollen cross-link density of a polymeric specimen. The apparatus includes a support structure, a fluid-holding structure to hold a solvent, a first gripping assembly engaged with a weight scale and adapted to grip a specimen and a second gripping assembly adapted to grip the specimen. The fluid-holding structure is attached to a multi-stage device attached to the support structure and displaceable upward or downward. A mechanism supported by the support structure and engaged with the multi-stage device and configured to displace the multi-stage device in fine gradations. When a specimen is gripped by the gripping assemblies and submerged in the solvent and the mechanism displaces the multi-stage device downward, a tensile force is exerted on the specimen. The tensile force is measured by a displacement gauge.