LPPI

The LPPI is a single team of 23 permanent staff and on average as many non-permanent staff (doctoral students, post-doctoral researchers, etc.)

The LPPI is a multidisciplinary team whose main expertise concerns the design, development, characterization and use in first devices of polymer materials with controlled architecture, ionic conductive polymer materials and (macro)molecular 𝞹-conjugated materials.

• The synthesis of innovative structural polymer materials is developed for different fields of application. For example, encapsulants for power electronics and the preservation of old papers but also on more fundamental aspects linked to interfaces and phase separations in monomolecular two-dimensional (2D) films or layers.

• If ions, grafted (polyelectrolytes) or ungrafted (exogenous salt), are introduced into these materials, they become ionic conductors used as membranes separating anode and cathode in batteries, electrolysers, supercapacitors, actuators and electrochromic devices, or more recently as ionic electrodes. These networks can integrate dynamic covalent functions allowing the development of self-healing ionic conductive vitrimers.

• The development of new 𝞹-conjugated materials ranges from small molecules to polymers via nanocarbons (carbon nanotube, graphene). Their semiconductor form is used for the fields of organic electronics: photovoltaics, photostimulable surfaces, while their conductive form is used for the production of electronic conductive electrodes, which can be transparent and stretchable. Their redox properties, electrochemically switchable, allow the development of electroactive electrodes in energy storage devices (supercapacitors) or electrostimulable devices (actuators, electrochromic devices) in particular in association with ionic membranes developed in parallel.

These skills therefore allow the LPPI to propose innovative solutions, even technological breakthroughs, on academic or industrial issues requiring new structural, functional or stimulable materials. This approach is mainly applied to issues of energy storage and conversion, as well as to the preservation and restoration of material heritage and, more recently, to materials for health.