26140
A series of well - defined thermoresponsive diblock copolymers ( PEO45 - b - PtNEAn , n = 22 , 44 , 63 , 91 , 172 ) were prepared by the atom transfer radical polymerization of trans - N - ( 2 - ethoxy - 1 , 3 - dioxan - 5 - yl ) acrylamide ( tNEA ) using a poly ( ethylene oxide ) ( PEO45 ) macroinitiator .
 Chemical: PEO45; Chemical: trans - N - ( 2 - ethoxy - 1 , 3 - dioxan - 5 - yl ) acrylamide; Chemical: tNEA; Chemical: poly ( ethylene oxide ); Chemical: PEO45
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PEO45, trans - N - ( 2 - ethoxy - 1 , 3 - dioxan - 5 - yl ) acrylamide, tNEA, poly ( ethylene oxide ), PEO45 
Answer:
 Chemical: PEO45; Chemical: trans - N - ( 2 - ethoxy - 1 , 3 - dioxan - 5 - yl ) acrylamide; Chemical: tNEA; Chemical: poly ( ethylene oxide ); Chemical: PEO45