title: Ethyl cellulose amphiphilic graft copolymers with LCST-UCST transition: Opposite self-assembly behavior, hydrophilic-hydrophobic surface and tunable crystalline morphologies.
abstract: Novel and well-defined graft copolymer with block copolymer side chain, ethyl cellulose-graft-(poly(ε-caprolactone)-block-poly(N,N-dimethylaminoethylmeth acrylate)) (EC-g-(PCL-b-PDMAEMA)) with a lower critical solution temperature (LCST) was successfully synthesized via the combination of ring-opening polymerization (ROP) and atom transfer radical polymerization (ATRP). EC-g-(PCL-b-PDMAEMA) copolymers with various PCL-b-PDMAEMA block lengths were obtained by adjusting the molar ratios of the N,N-dimethylaminoethyl methacrylate monomer to ε-caprolactone. The EC-g-(PCL-b-PDMAPS) with an upper critical solution temperature (UCST) was obtained via facile quaternization reaction of PDMAEMA with 1,3-propane sultone. EC-g-(PCL-b-PDMAEMA) and EC-g-(PCL-b-PDMAPS) micelle solutions showed opposite thermoresponsiviness and hydrophilic-hydrophobic surface. Moreover, the tunable crystalline morphologies could be obtained from these graft copolymers through changing the polymer structure and PDMAEMA contents.
authors.affiliation: School of Materials Science and Engineering, Key Laboratory of Advanced Civil Materials of Ministry of Education, Tongji University, 201804, People's Republic of China.
authors.forename: Hua
authors.initials: H
authors.lastname: Yuan
authors.affiliation: School of Materials Science and Engineering, Key Laboratory of Advanced Civil Materials of Ministry of Education, Tongji University, 201804, People's Republic of China.
authors.forename: Hai
authors.initials: H
authors.lastname: Chi
authors.affiliation: School of Materials Science and Engineering, Key Laboratory of Advanced Civil Materials of Ministry of Education, Tongji University, 201804, People's Republic of China. Electronic address: yuanwz@tongji.edu.cn.
authors.forename: Weizhong
authors.initials: W
authors.lastname: Yuan
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D003460:Crystallization; D057927:Hydrophobic and Hydrophilic Interactions; D008689:Methacrylates / Q000737:chemistry; D008823:Micelles; D011091:Polyesters / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D008689:Methacrylates; D008823:Micelles; D011091:Polyesters; D011108:Polymers; C016240:polycaprolactone; C013517:ethyl cellulose; D002482:Cellulose; C049840:2-(dimethylamino)ethyl methacrylate
keywords: Ethyl cellulose; Graft polymers; LCST-UCST transition; Micelles; Self-assembly