New GMT material suitable for various polymers and high glass fibre content

As a kind of long fibre reinforced thermoplastic, a new glass mat thermoplastic GMT-like material is introduced. It is designed to be suitable for various polymers and high glass fibre GF content, which might be a promising attempt to overcome the limit of conventional GMT material PP matrix and maximum 40 wt- GF. The concept is based on a multi-layered hybrid structure consisting of several thin GF sub-layers and polymer films having an inherently high viscosity. They are then needle-matted all together. The capability of higher GF content was derived from the porosity changes under pressure and the cross-sectional view after impregnation. It was finally confirmed by measurement of flexural properties up to 70 wt- of GF content in PP grade. Moreover, PA6 grade was investigated to show the other capability of multi-layered hybrid mat for various polymers.