The polyelectrolytes can become {TAIL ~ cross} linked and unable to undergo further transitions in {HEAD ~ porosity} 
The polyelectrolytes can become { TAIL ~ cross } linked and unable to undergo further transitions in { HEAD ~ porosity }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD