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