Novel poly(3-hydroxy butyrate) macro RAFT agent. Synthesis and characterization of thermoresponsive block copolymers
B Hazer, Melike Eren, Yetkin Senemoglu, Tina Modjinou, Estelle Renard, Valerie Langlois
article (Uluslararası, Hakemli) | Yazar(lar): B Hazer, Melike Eren, Yetkin Senemoglu, Tina Modjinou, Estelle Renard, Valerie Langlois | Yıl: 2020 | Dergi/Kurum: JOURNAL OF POLYMER RESEARCH | İndeks: WOS.SCI | DOI: 10.1007/s10965-020-02133-1 | Anahtar Kelimeler: Poly (3-hydroxy butyrate), RAFT polymerization, Polymeriza
A novel reversible addition fragmentation transfer (RAFT) agent based on the poly-3-hydroxy butyrate (PHB) with three hydroxyl groups (PHB-R2) and thermoresponsive amphiphilic block copolymers derived from N-isopropyl acryl amide (NIPAM) are described. Hydroxylated PHB is obtained by the reaction between PHB and diethanol amine (DEA) to prepare hydroxylated PHB (PHB-DEA). It is then reacted with a RAFT agent, 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid (DDMAT). Hydroxyl ends of the hydroxylated PHB are capped with carboxylic acid end of the trithiocarbonate. The block copolymers obtained by the polymerization of NIPAM initiated by PHB-R2 were characterized by H-1 NMR and physicochemical techniques. PHB content in the obtained block copolymers is varying between 14 and 45 wt%. The thermo-responsive PHB-PNIPAM block copolymers show the lower critical solution temperature (LCST) 28 and 30 degrees C while LCST of the pure PNIPAM is 32 degrees C.