Poly(styrene-b-4-vinylphenoxyphthalonitrile)-Cobalt Complexes and Their Conversion to Oxidatively Stable Cobalt Nanoparticles
Poly(styrene-b-4-vinylphenoxyphthalonitrile)-Cobalt Complexes and Their Conversion to Oxidatively Stable Cobalt Nanoparticles
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DOI：
10.1021/cm0482028
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发表时间：
2005-09
影响因子：
8.6
通讯作者：
V. Baranauskas;M. Zalich;M. Saunders;T. Pierre;J. Riffle
中科院分区：
文献类型：
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作者：
V. Baranauskas;M. Zalich;M. Saunders;T. Pierre;J. Riffle
氧化稳定，磁性钴纳米粒子已通过加热聚（苯乙烯-b-4-乙烯基苯氧基邻苯二甲腈）嵌段共聚物封装在高温下制备。通过苯乙烯和叔丁基二甲基硅氧基苯乙烯的顺序阴离子聚合，合成了嵌段共聚物。第二嵌段上的硅醚保护基在酸性条件下水解得到聚（苯乙烯-b-4-乙烯基苯酚），然后用4-硝基邻苯二甲腈对二嵌段共聚物的侧链酚进行化学改性得到聚（苯乙烯-b-4-乙烯基苯氧基邻苯二甲腈）。通过在含有聚（苯乙烯-b-4-乙烯基苯氧基邻苯二甲腈）的甲苯溶液中热分解八羰基二钴，形成直径为1.8 - 10 nm的钴金属纳米颗粒的稳定悬浮液。钴-聚合物纳米颗粒复合物在氩气下热解，得到包裹在石墨状涂层中的高磁性钴纳米颗粒。磁化率测量仪
Oxidatively stable, magnetic cobalt nanoparticles have been prepared by heating cobalt nanoparticles encapsulated in poly(styrene-b-4-vinylphenoxyphthalonitrile) block copolymers at elevated temperatures. The block copolymers were synthesized through the sequential anionic polymerization of styrene and tert-butyldimethylsilyloxystyrene. The silyl ether protecting groups on the second block were hydrolyzed under acidic conditions to afford poly(styrene-b-4-vinylphenol), and then the pendent phenols of the diblock copolymer were chemically modified with 4-nitrophthalonitrile to afford poly(styrene-b-4-vinylphenoxyphthalonitrile). Stable suspensions of ∼8−10 nm diameter cobalt metal nanoparticles were formed by thermolysis of dicobalt octacarbonyl in solutions of toluene containing poly(styrene-b-4-vinylphenoxyphthalonitrile). The cobalt−polymer nanoparticle complexes were pyrolyzed under argon to afford highly magnetic cobalt nanoparticles encased in graphitic-like coatings. Magnetic susceptibility measurem...