Films & Surfaces

Modus Operandi

• tangent measurement of elongation of cylindrical samples as a function of temperature
• different reaction forces and stamping forms possible

Application

• determination of the coefficient of thermal expansion (CTE) (at nearly forceless measurement with planar plating stamps)
• analysis of inner stresses
• determination of softening spots (by superimposing of loads and use of hemispherical stamps)

Modus Operandi

Measurement of the change in weight as a function of temperature and time with parallel DTA-function

Application

• analysis of the thermal degradation of polymers
• determination of filler or fiber content in composite materials
• determination of water absorption and residual solvent contents

Modus Operandi

• sinusoidal mechanical straining of a sample
• measurment of phase shift between the amplitude of interaction and distortion (draw, flexure, shear strain) respectively torsional moment and shearing angular (torsion)
• determination of E and G modulus (E*, G*) (known sample geometry) and of tanδ

Application

• determination of temperature and frequence dependency of storage modulus (E', G'), loss modulus (E'', G'') and mechanical loss factor (tanδ)
• analysis of dynamical glass transition and lateral relaxation regions
• analysis of the phase structure of multiphase polymeric materials
• determination of cross-linking densities (from the height of the rubber plateau modulus)
• analysis of the influence of absorbed water over the thermo-mechanical properties
• analysis of physical and chemical aging
• determination of the degree of cure of thermosets

Modus Operandi

• determination of the complex shear modulus of solid samples by interpretation of a freely damped torsion oscillation depending on temperature at constant frequence
• determination of the parameters by very accurate time measurement of the periodic time and zero-crossing velocity
• staionary arrangement of the tester, acceptance of additional oscillating weight above the sample
• weight compensation by a thin span wire above the balance beam (in-house development)

Application

• analog to DMTA but more accurate determination of small tanδ-values and more accurate modulus determination in the rubbery-elastic range
• determination of the temperature dependency of storage modulus (G'), loss modulus (G'') and mechanical loss factor (tanδ)
• analysis of dynamic glass transition and lateral relaxation regions
• analysis of the phase structure of multiphase polymeric materials
• determination of cross-linking densities (from the height of the rubber plateau modulus
• * analysis of physical and chemcial aging processes

Modus Operandi

• determination of the enthalpy of caloric processes through measurement of the thermal flow between sample and reference by linear and isothermal heating (or cooling)
• calibration of heat flow volume by melting heat standards

Application

• determination of the temperature of phase changes (crystalline and amorphic changes)
• determination of glass transition temperature (change of specific heat)
• determination of heat of reactions

nano-TMA/TGA/DVS

• thermophysical characterization (TMA, TGA, DVS) of thin transparent layers in sub-µm-range
• in-house development