To test the platelet adhesion and activation,the mats were placed in 48-well plates. To each well, 500μl human platelet-rich plasma(PRP) was added and incubated at37°C for 1h.The PRP was removed and the mats were rinsed with PBS for three times to remove the unattached platelets. After dehydration, the platelet adhesion on the mats was observed by SEM and the activation state of the platelets adhered to the mats was measured using a human P-selectin ELISA Kit.