Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States.
J Am Chem Soc. 2016 Apr 6;138(13):4616-25. doi: 10.1021/jacs.6b01271. Epub 2016 Mar 24.
A series of alkyne-functionalized poly(4-(phenylethynyl)styrene)-block-poly(ethylene oxide)-block-poly(4-(phenylethynyl)styrene) (PPES-b-PEO-b-PPES) ABA triblock copolymers was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. PESn[Co2(CO)6]x-EO800-PESn[Co2(CO)6]x ABA triblock copolymer/cobalt adducts (10-67 wt % PEO) were subsequently prepared by reaction of the alkyne-functionalized PPES block with Co2(CO)8 and their phase behavior was studied by TEM. Heating triblock copolymer/cobalt carbonyl adducts at 120 °C led to cross-linking of the PPES/Co domains and the formation of magnetic cobalt nanoparticles within the PPES/Co domains. Magnetic hydrogels could be prepared by swelling the PEO domains of the cross-linked materials with water. Swelling tests, rheological studies and actuation tests demonstrated that the water capacity and modulus of the hydrogels were dependent upon the composition of the block copolymer precursors.
通过可逆加成-断裂链转移（RAFT）聚合合成了一系列炔基官能化的聚（4-（苯乙炔基）苯乙烯）-嵌段-聚（氧化乙烯）-嵌段-聚（4-（苯乙炔基）苯乙烯）（PPES-b-PEO-b-PPES）ABA 三嵌段共聚物。随后，通过炔基官能化的 PPES 嵌段与 Co2(CO)8 的反应制备了 PESn[Co2(CO)6]x-EO800-PESn[Co2(CO)6]x ABA 三嵌段共聚物/钴加合物（10-67wt%PEO），并通过 TEM 研究了它们的相行为。将三嵌段共聚物/钴羰基加合物在 120°C 下加热导致 PPES/Co 域的交联以及 PPES/Co 域内磁性钴纳米粒子的形成。通过用水溶胀交联材料的 PEO 域可以制备磁性水凝胶。溶胀试验、流变研究和致动试验表明，水凝胶的水容量和模量取决于嵌段共聚物前体的组成。
