Polymeropoulos George, Bilalis Panayiotis, Hadjichristidis Nikos
King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, KAUST Catalysis Center, Polymer Synthesis Laboratory, Thuwal 23955, Saudi Arabia.
ACS Macro Lett. 2016 Nov 15;5(11):1242-1246. doi: 10.1021/acsmacrolett.6b00807. Epub 2016 Oct 27.
Two well-defined cyclic triblock terpolymers, missing pieces of the terpolymer morphology puzzle, consisting of poly(isoprene), polystyrene, and poly(2-vinylpyridine), were synthesized by combining the Glaser coupling reaction with anionic polymerization. An α,ω-dihydroxy linear triblock terpolymer (OH-PI--PS--P2VP-OH) was first synthesized followed by transformation of the OH to alkyne groups by esterification with pentynoic acid and cyclization by Glaser coupling. The size exclusion chromatography (SEC) trace of the linear terpolymer precursor was shifted to lower elution time after cyclization, indicating the successful synthesis of the cyclic terpolymer. Additionally, the SEC trace of the cyclic terpolymer produced, after cleavage of the ester groups, shifted again practically to the position corresponding to the linear precursor. The first exploratory results on morphology showed the tremendous influence of the cyclic structure on the morphology of terpolymers.
通过将格拉泽偶联反应与阴离子聚合相结合，合成了两种结构明确的环状三嵌段三元共聚物，它们填补了三元共聚物形态拼图中缺失的部分，由聚异戊二烯、聚苯乙烯和聚（2-乙烯基吡啶）组成。首先合成了一种α,ω-二羟基线性三嵌段三元共聚物（OH-PI--PS--P2VP-OH），然后通过与戊炔酸酯化将OH转化为炔基，并通过格拉泽偶联进行环化。线性三元共聚物前体的尺寸排阻色谱（SEC）曲线在环化后移至较低的洗脱时间，表明环状三元共聚物的成功合成。此外，在酯基裂解后产生的环状三元共聚物的SEC曲线实际上再次移至对应于线性前体的位置。关于形态的初步探索结果表明，环状结构对三元共聚物的形态有巨大影响。
