Physico-chemical Charaterization

Persons in charge: 
Gaelle MINARD

The main physico-chemical methods used in the laboratory can be classified into 7 groups

1. Rheometry

These experimenal tools permit fine characterization of viscoelastic behavior based on frequency and temperature. Data analysis makes it possible to determine the relaxation spectrum and molecular mass distributions.

Tests can be performed on solid-state samples:

as well as samples in the molten state:

In addition, the variation of viscosity in relation to the shear rate can be given using the Thermo Haake capillary rheometer.

 

2. Spectrometers

a- Infrared spectrophotometers

We currently have three devices:

  • A Perkin Elmer IR Fontier spectrophotometer working in transmission and reflection. This unit allows most common analyses to be carried out.
  • Perkin Elmer IR TWO spectrophotometer equipped with a pressurized cell. This unit allows for calorimetric analysis of materials up to   bars
  • A high-performance Perkin Elmer Spectrum Spotlight 300 spectrophotometer equipped with a microscope and TRM. It makes it possible to carry out reflection mapping with a resolution of about 3 to 5 µm.

b- UV spectrometer

UV Perkin Elmer Lamba 35

 

3. Thermal analysers

a- Differential scanning calorimeters (DSC)

We are equipped with 4 appliances allowing routine analyses to be carried out (Tg, TIO, Tf, etc.)

 

b-  Thermogravimetric analysers

This analysis makes it possible to determine the variations of mass of a sample subjected to temperature ramps.

  • TGA Q50 by TA Instruments up to a temperature of 1000°C. The unit is equipped with a system making it possible to have a mixture of gases (O2/N2) in the desired proportions in the oven.

 

4. Liquid chromatography

  • HLPC WATERS: the unit is equipped with a 717+ injector with auto-sampler, a UV PDA 2998 sensor, a 2414 refractometer, and columns for GPC and HPLC. The unit can work in isocratic or gradient mode.

  • GPC 220 HT AGILENT:  this technique makes it possible to measure the distribution of polymer molar mass at temperatures up to 200°C. This unit comprises double detection: by refraction index and by laser diffraction of the eluting phase.

5. Polymer-solvent interactions

The laboratory is equipped with a high-performance Dynamic Vapor Sorption unit (DVS 100) making it possible to determine the sorption curves of solvents through polymer films and to establish the diffusion kinetics.

 

6. Permeability

 

7. Surface preparation