Currently Rector/President of University of Mons UMONS & President-Scientific Director of RD&I center Materia Nova asbl
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Polylactide (PLA), a biodegradable polyester produced from renewable resources, has a key position in the very promising market for bioplastics. Unfortunately, for utilization in durable/engineering applications, PLA suffers from some shortcomings (low-thermal resistance, heat distortion temperature (HDT) and rate of crystallization, brittleness and low ductility, degradation by hydrolysis). The melt-mixing of PLA with various polymers in presence of selected compatibilizers, is an efficient and cost-effective method largely used to tailor and tune-up the properties of PLA-based products. The blending of bio-based, brittle and mostly amorphous PLA with semi-crystalline polyamides (e.g. bio-sourced (PA11) or not (PA12)) has been reported to lead to high performance materials having improved toughness, ductility, increased HDT and better thermal resistance. The low crystallinity of PLA is believed to strongly influence the final properties and to limit the applications of PLA products. Following different R&D strategies and the validation of optimized PLA/PA blends at laboratory scale, it is expected that these developments will open new perspectives for the use of PLA-based products in durable applications (transportation, electronics, mechanical and automotive parts).
Torogyps is a new scientific collaboration between Materia Nova Materials R&D Center- with research activities devoted to the production of new polymer (nano)composites, and TORO GIPS which is involved in production of natural CaSO4 of high whiteness & purity. One key-objective is to contribute to the increase of interest and demands for utilization of stable CaSO4 forms in various applications (automotive engineering, electronic and electrical parts, packaging, and so on) in competition with the traditional fillers (talc, calcium carbonate, others). Unfortunately, the forms of stable anhydrite (so-called “insoluble” anhydrite II, AII) are less known by the different users of fillers. Moreover, a general confusion connected to the quick absorption of water which is specifically to gypsum hemihydrate (CaSO4 x 0.5 H2O) with the formation of CaSO4 dihydrate exist, and this was found as detrimentally for the utilization of stable forms of CaSO4, especially for production of polymer composites. Characterized by high whiteness and purity, low abrasion and hardness, resistance to weak acids and good stability at high temperature, other beneficial properties, the adequately surface treated/ physico-chemically modified AII could show a big potential as functional additive for the reinforcing of various polymers of petrochemical origin or/and obtained from renewable resources (biopolymers), leading to composites characterized by good appearance, processing, improved properties (mechanical rigidity, thermal & dimensional stability, whiteness, etc.) and competitive price. Moreover, addition of a third component into these polymeric compositions filled with AII, i.e., plasticizers, impact modifiers, clays, flame retardants, etc., could be considered to obtain new composites designed with specific end-use properties.
1. make controlled size spherical beads of polymethylsilsesquioxanes PMSQ 2. attach them with long alkyl chain of oleic acid 3. use this material for lubrication, anti-fouling and anti scraching properties