AIP Conference Proceedings [AIP Publishing XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY - Xiamen, China (3–7 January 2019)] XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY - The effect of dates palm trunk particles as improvement reinforcement material of polymeric composites and sustainable environmental material