Highlights
DEA 288 Ionic - Opening a New World of Cure Monitoring
Dielectric Analysis (DEA), also known as Dielectric Thermal Analysis (DETA), is a technique for monitoring changes in the viscosity and cure state of thermosetting resins, adhesives, paints, composites and other kinds of polymers or organic substances by measuring variations in their dielectric properties. DEA is the most powerful measurement technique for the critical, invisible in-mold Curing (Crosslinking Reactions)Literally translated, the term “crosslinking“ means “cross networking”. In the chemical context, it is used for reactions in which molecules are linked together by introducing covalent bonds and forming three-dimensional networks.curing that dictates the quality of a component.
The DEA 288 Ionic offers customized test conditions, available in either a process-implementable "Rack" version or a versatile "Portable" version. For laboratory investigations, a variety of accessories can be used, including a laboratory furnace that can be combined with a UV-light source, as well as a humidity chamber and lab press for precise re-creation of specific conditions.
Designed with ease of sample handling in mind, the DEA 288 Ionic requires no special sample preparation, unlike many other measurement techniques. With a broad range of sensors available, almost any practical application can be accommodated. These include spray coating of thin films, application by a drawbar, spreading of low- or medium-viscosity materials, positioning the sensor between layers of a prepreg, dipping the sensor in a liquid, and monitoring in-mold Curing (Crosslinking Reactions)Literally translated, the term “crosslinking“ means “cross networking”. In the chemical context, it is used for reactions in which molecules are linked together by introducing covalent bonds and forming three-dimensional networks.curing processes.
Often, polymers achieve their full performance potential only upon being combined with active additives. Such additives serve to adjust the morphology or the polymer architecture in a targeted manner. With the DEA 288 Ionic, the effectiveness of accelerators, inhibitors, and antioxidants can be measured quickly and reliably, as can the impact of substances such as fillers. Such insight can have tremendous impact on efforts to shorten the development process.
sensXPERT®
Innovative sensors creating intelligent molds
Material science builds the foundation of the machine learning algorithm. Together with data of your machines, optimal Curing (Crosslinking Reactions)Literally translated, the term “crosslinking“ means “cross networking”. In the chemical context, it is used for reactions in which molecules are linked together by introducing covalent bonds and forming three-dimensional networks.curing of the material is predicted. The cutting edge software dynamically adapts your production process and eliminates the need of costly quality control after production. sensXPERT® increases your production efficiency, minimizes scrap rates and enables you to run a more robust, reliable and reproducible plant.
Portable Version
The portable version with up to 7 channels, this DEA is the flexible version for your day-to-day work. It can be easily transported between different measurement locations.
Rack Version
The 19'' rack version is designed for an electrical cabinet. It supports 8 simultaneous measuring channels which can be extended to up to 16 modules.
The DEA 288 Ionic was originally designed specifically for use in laboratories – whether industrial or academic. However, the same instruments and sensors can also be used in manufacturing environments. The DEA 288 Ionic thus allows for the transfer of parameters developed in the lab directly to production.
The following process parameters can be determined:
- Viscosity
- Gel point
- Cure behavior
Method
Dielectric (Thermal) Analysis
The functional principle is consistent with that of an impedance measurement. In a typical test, the sample is placed in contact with two electrodes (the dielectric sensor). When a sinusoidal voltage is applied, the charge carriers inside the sample are forced to move: positively charged particles migrate to the negative pole and vice versa. This movement results in a sinusoidal current with a phase shift. In the frequency range of the DEA 288 Ionic (up to 1 MHz), the charge carriers are mainly ions (often present as catalysts or impurities), but dipole alignment also takes place within the electrical field.
The response signals – current and phase shift – are a function of the ion and dipole mobility. This relationship makes dielectric (thermal) analysis an ideal method for cure monitoring, the sample's viscosty is increasing dramatically. As a consequence, the mobility of the charge carriers decreases, followed by a corresponding attenuation of the amplitude and an increased phase shift in the resulting signal.
Results
An outer electric field generated by an excitation voltage is applied to the sample and the response, occurring as a current through the material, is measured. Dipoles will be aligned and the ions will move towards the oppositely charged electrode, which can be seen in ε' and ε'', respectively. Based on the sample's characteristics, a time shift between excitation and response signal is detected that, together with voltage and current, allows for the calculation of dielectric magnitudes.
In detail, this yields information about:
- Flow behavior
- Reactivity
- Cure progress
Specifications
| DEA 288 Ionic | |
|---|---|
| Frequency range | 1 mHz to 1 MHz, freely selectable values |
| Data acquisition | Multiple DEA modules; true simultaneous operation of all channels |
| Minimum data acquisition time | < 5 ms |
| Sensor connection | Shielded 4-wire technique (compensation of resistivity and capacity of the wire as a prerequisite for precise measurements) |
| DEA modules |
|
| I/O ports | Input and output of measuring signals or signals from peripheral devices such as pressure or temperature sensors. DEA allows for triggering by manufacturing machines. |
Accessories:
Proven Excellence in Service
At NETZSCH Analyzing & Testing, we offer a comprehensive range of services globally to ensure the optimal performance and longevity of your thermoanalytical equipment. With a track record of proven excellence, our services are designed to maximize the effectiveness of your devices, extend their lifespan, and minimize downtime.
Unlock the full potential of your equipment with our tailored solutions, backed by years of industry expertise and innovation.
Software
Proteus® Software - Powerful and Easy to Use
Comprehensive Measurement and Evaluation Software
The measuring part of the software provides the user with a modern, user-friendly operating interface. Proteus® now offers a quick and convenient input assistant for programming all relevant measurement parameters. Color coded tabs facilitate data entry and guarantee that no important parameter is forgotten – whether it relates to information about the sample, the temperature/time program or the desired frequencies. Segments can be adapted (time, temperature, frequency) during a running measurement. In addition, a snapshot can be taken to analyze the data recorded up until that point.
Communication with certain accessories can be activated with a simple click. The NETZSCH Proteus® software controls the temperature profile of the lab furnace and triggers the UV lamp.
The desired channels can be easily enabled by selecting the appropriate check box. Active channels are colored green.
Selection of a suitable sensor is very easy. The software contains a complete list of all available sensors, including their particular technical specifications. Important parameters such as electrode spacing (distance) or A/D ratio (ratio between area and distance) are automatically set together with the sensor type. Additionally, sensors may be defined by the user.
The well-proven Proteus® software ensures comprehensive analysis. It allows for easy inputting of a measurement's parameters and features routines for data acquisition and evaluation with maximum flexibility.
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