Formation of nanoscale networks: Selectively swelling amphiphilic block copolymers with CO2-expanded liquids

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	Formation of nanoscale networks: Selectively swelling amphiphilic block copolymers with CO2-expanded liquids
	Gong, Jianliang ; Zhang, Aijuan ; Bai, Hua ; Zhang, Qingkun ; Du, Can ; Li, Lei ; Hong, Yanzhen ; Li, Jun ; Bai H(白华) ; Li J(李军) ; Li L(李磊)
刊名	http://dx.doi.org/10.1039/c2nr33188h
	2013-02-07
关键词	Block copolymers Film preparation Methanol Nanotechnology Polypyrroles Polystyrenes
英文摘要	Polymeric films with nanoscale networks were prepared by selectively swelling an amphiphilic diblock copolymer, polystyrene-block-poly(4- vinylpyridine) (PS-b-P4VP), with the CO2-expanded liquid (CXL), CO2-methanol. The phase behavior of the CO2-methanol system was investigated by both theoretical calculation and experiments, revealing that methanol can be expanded by CO2, forming homogeneous CXL under the experimental conditions. When treated with the CO 2-methanol system, the spin cast compact PS-b-P4VP film was transformed into a network with interconnected pores, in a pressure range of 12-20 MPa and a temperature range of 45-60°C. The formation mechanism of the network, involving plasticization of PS and selective swelling of P4VP, was proposed. Because the diblock copolymer diffusion process is controlled by the activated hopping of individual block copolymer chains with the thermodynamic barrier for moving PVP segments from one to another, the formation of the network structures is achieved in a short time scale and shows "thermodynamically restricted" character. Furthermore, the resulting polymer networks were employed as templates, for the preparation of polypyrrole networks, by an electrochemical polymerization process. The prepared porous polypyrrole film was used to fabricate a chemoresistor-type gas sensor which showed high sensitivity towards ammonia. ? 2013 The Royal Society of Chemistry.
语种	英语
出版者	Royal Society of Chemistry
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/87290]
专题	材料学院－已发表论文
推荐引用方式 GB/T 7714	Gong, Jianliang,Zhang, Aijuan,Bai, Hua,et al. Formation of nanoscale networks: Selectively swelling amphiphilic block copolymers with CO2-expanded liquids[J]. http://dx.doi.org/10.1039/c2nr33188h,2013.
APA	Gong, Jianliang.,Zhang, Aijuan.,Bai, Hua.,Zhang, Qingkun.,Du, Can.,...&李磊.(2013).Formation of nanoscale networks: Selectively swelling amphiphilic block copolymers with CO2-expanded liquids.http://dx.doi.org/10.1039/c2nr33188h.
MLA	Gong, Jianliang,et al."Formation of nanoscale networks: Selectively swelling amphiphilic block copolymers with CO2-expanded liquids".http://dx.doi.org/10.1039/c2nr33188h (2013).