The University of Southern Mississippi , School of Polymers and High Performance Materials, 118 College Drive # 5050, Hattiesburg, Mississippi 39406, United States.
United States Air Force Academy , Department of Chemistry and Chemistry Research Center, 2355 Fairchild Drive Suit 2N225, Colorado Springs, Colorado 80840, United States.
ACS Appl Mater Interfaces. 2016 May 18;8(19):12434-44. doi: 10.1021/acsami.6b01936. Epub 2016 May 6.
Hybrid systems in which poly(ether sulfone) (PESU) chains are grafted to semifluorinated polyhedral oligomeric silsesquioxane (POSS) cores are expected to integrate the advantages of both fluoropolymers and POSS into the polymer system to yield excellent surface properties. For that purpose, we synthesized a novel octa-functional perfluorocyclopentenyl-POSS (PFCP-POSS), which was used as a "core" grafting point. Commercial PESU was successfully grafted to PFCP-POSS via the nucleophilic addition-elimination reaction between the phenolic chain ends and reactive PFCP moieties to yield a hybrid branched polymer possessing a semifluorinated POSS core. X-ray photoelectron spectroscopy, neutron reflectivity, and atomic force microscopy indicated that the preparation of nanostructured polymer surfaces occurs by migration of the low surface energy components (PFCP-POSS molecules), while POSS aggregation is suppressed by covalent attachment to the long PESU chains. The resulting PFCP-POSS modified PESU films were highly transparent and yielded hydrophobic surfaces with low surface energy and high modulus for potential applications in high performance coatings and composites.
预计将聚醚砜 (PESU) 链接枝到半氟化多面体低聚倍半硅氧烷 (POSS) 核上的杂化系统将结合氟聚合物和 POSS 的优势集成到聚合物系统中，从而获得优异的表面性能。为此，我们合成了一种新型的八官能全氟环戊烯基-POSS (PFCP-POSS)，它可用作“核”接枝点。通过酚醛链末端和反应性 PFCP 部分之间的亲核加成-消除反应，商业 PESU 成功接枝到 PFCP-POSS 上，得到具有半氟化 POSS 核的支化杂化聚合物。X 射线光电子能谱、中子反射率和原子力显微镜表明，通过低表面能成分 (PFCP-POSS 分子) 的迁移来制备纳米结构聚合物表面，而 POSS 聚集则通过与长 PESU 链的共价键合来抑制。所得的 PFCP-POSS 改性 PESU 薄膜具有高透明度，并具有低表面能和高模量的疏水面，可潜在应用于高性能涂料和复合材料。
