MATERIALS | ENGINEERING THERMOPLASTICS
Above: Eurotec has a new PA with high hydrolysis resistance
team developed a structural hybrid alternative.” This design uses both plastic and metal to
produce a lightweight energy-absorbing honey- comb rocker reinforcement, which can protect the battery system mounted to the floor of an EV. The thermoplastic material, Xenoy HTX, a polyester alloy, is modified to absorb significant energy and withstand deformation in the event of a crash. The part can offer 40-60% weight savings compared to an all-metal version and up to 10% extra energy absorption.
In addition to providing improved energy absorption, the structural hybrid reinforcement with Xenoy HTX resin for battery packs can meet dimensional stability, rigidity, and mechanical strength requirements. Polyscope, a leader in materials based on
styrene maleic anhydride (SMA), has a new series of alloys of PA6 with SMI, an imidized SMA: Xiloy IG300-IM (unfilled, impact modified), Xiloy IG360 (30% glass-filled) and Xiloy IG360-IM (30% glass- filled, impact modified). Polyscope says they have moisture uptake and loss of stiffness properties very similar to more expensive long-chain polyam- ides or semi-aromatic polyamides. According to
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the company, SMI, which has a glass transition temperature of around 180°C, “not only significant- ly reduces the loss of stiffness of PA6 when the temperature goes up to 80-100°C, it also signifi- cantly reduces the moisture uptake of PA6-GF30 to levels of 1-2%.” This set of properties makes the Xiloy IG-series very interesting for applications where dimensional stability under hot and humid conditions is key, for instance in fan blades, electronics housings, and other E&E parts. Compared to regular PA6 and PA66, less reinforcement is needed to maintain strength, thereby reducing part weight. Polyscope has added Xiloy SO2315, a transpar- ent PMMA/SMA alloy with a higher softening point than pure PMMA, a reduced moisture uptake and an increased surface functionality while maintain- ing the excellent optical properties of PMMA. First application is in substrates for medical test kits in which biomolecules are attached to the surface of the test kit through the SMA’s anhydride chemistry. “The increased surface functionality of the SO2315 is now also being explored for in-mould coating purposes,” the company says. Avient unveiled two additions to its Trilliant family
of healthcare formulations in October. It says the new flame retardant materials, Trilliant HC8910 and HC8920, have better resistance to hospital-grade disinfectants (in terms of retention of mechanical properties and aesthetics, and stress-crack resist- ance) than other FR compounds based on polymers such as PC/ABS, PC/PET, and copolyester. It does not divulge the type of polymer or flame retardant system it is using, but does say Trilliant HC8910 and HC8920 are made without BPA, which means they do not contain polycarbonate. They are available in standard or custom colours. The HC8920 grades achieve UL94 V-0 at 1.5mm. Teknor Apex has addressed demands for halogen-free FR compounds with exceptional mechanical performance and superior surface
IMAGE: EUROTEC
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