Polymer Nanocomposites through Controlled Self-Assembly of Cubic Silsesquioxane Scaffolds
Polymer Nanocomposites through Controlled Self-Assembly of Cubic Silsesquioxane Scaffolds
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DOI：
10.1021/ma048557c
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发表时间：
2004-10
期刊：
影响因子：
5.5
通讯作者：
Lei Zheng;Sheng Hong;G. Cardoen;Engin Burgaz;S. Gido;E. B. Coughlin
中科院分区：
文献类型：
--
作者：
Lei Zheng;Sheng Hong;G. Cardoen;Engin Burgaz;S. Gido;E. B. Coughlin
报道了一种由下而上的制备聚合物纳米复合材料的新方法，该方法以立方倍半硅氧烷（POSS）纳米粒子为结构单元。该设计基于颗粒之间的缔合相互作用以形成有序的纳米结构和有限的晶体生长以呈现各向异性形状。具体地说，POSS单元之间的亲和力导致这些颗粒聚集并紧密地堆积成晶格。有机聚合物，共价连接到每个POSS单元，限制结晶成一个二维的晶格中所示的聚丁二烯和立方倍半硅氧烷的无规共聚物。该共聚物是通过环辛烯和带有可聚合的环己烯基团的POSS的开环易位共聚合成的。用NMR、DSC、TEM、WAXD和SAXS对聚合物进行了表征。TEM和X-射线衍射的数据清楚地显示了组装立方倍半硅氧烷的二维层状纳米结构的形成。
A novel bottom-up approach to obtain polymer nanocomposites using cubic silsesquioxanes (POSS) nanoparticles as building blocks is reported. The design is based on associative interaction between particles to form ordered nanostructure and limited crystal growth to render anisotropic shapes. Specifically, the affinity between POSS units causes these particles to aggregate and closely pack into a crystalline lattice. The organic polymer, covalently connected to each POSS unit, limits the crystallization into a two-dimensional lattice as demonstrated in random copolymers of polybutadiene and cubic silsesquioxanes. The copolymers were synthesized by ring-opening metathesis copolymerization of cyclooctadiene and POSS bearing a polymerizable norbornene group. The polymers were characterized using NMR, DSC, TEM, WAXD, and SAXS. The data from TEM and X-ray diffraction clearly show the formation of two-dimensional lamellar-like nanostructures of assembled cubic silsesquioxanes.