A polymer blend comprising one or more polymers 1 and {HEAD ~ one or more polymers} having semiconducting, charge transport, {TAIL ~ hole/electron transport}, hole/electron blocking, electrically conducting, photoconducting or light emitting properties 
having
A polymer blend comprising one or more polymers 1 and { HEAD ~ one or more polymers } having semiconducting , charge transport , { TAIL ~ hole / electron transport } , hole / electron blocking , electrically conducting , photoconducting or light emitting properties
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH