Changing Physic materials with a script.

Hello, I'd like to change bounciness in Physics material with a script. So when player hits game object bouncines changes for some %. Here is the script I've made until now. It doesn't work..

 var PlayerColl: Collider;
 var material: PhysicMaterial;
 var dynamicFriction=2;
 var target:Transform;
 var col : Collider;
 
 
 function Start() {
     PlayerColl = GetComponent.<Collider>();
     
     material = new PhysicMaterial();
     material.dynamicFriction = dynamicFriction;
     material.bounciness = 1;
     PlayerColl.material = material;
     
 }
 
 function OnTriggerEnter(col : Collider)
  {
      if(col.transform.name == "Player")
      {
          material.bounciness = 1*0.1;
      }
  }

Thank you.