While in the case of pMeOx, hydrophilic homopolymer, the thick polymer mass was dissolved in 1:1 mixture of chloroform and methanol. The polymer solution was added dropwise into the ice cold diethyl ether under continuous stirring. After polymer precipitation, the diethyl ether was decanted. The residual diethyl ether was removed at rotary evaporator. The polymer mass was dissolved in deionized (DI) water and lyophilized.