{HEAD ~ Any suitable apparatus} which permits intimate mixture of the polymer and core materials, the introduction of the supercritical fluid at a pressure sufficient to maintain its supercritical state, {TAIL ~ release} of pressure from the system, expansion of the preparation and separation of the SCF can be used for this process 
permits
{ HEAD ~ Any suitable apparatus } which permits intimate mixture of the polymer and core materials , the introduction of the supercritical fluid at a pressure sufficient to maintain its supercritical state , { TAIL ~ release } of pressure from the system , expansion of the preparation and separation of the SCF can be used for this process
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH