期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 36, 期 18, 页码 1669-1674出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201500250
关键词
multi-scale porous films; layer by layer; polyelectrolytes; polymers; deposition time; molecular weight
资金
- MSU Foundation
- DOD Strategic Environmental Research and Development Program [DOD SERDP W912HQ-12-C-0020]
This work focuses on the design of porous polymeric films with nano-and micro-sized pores existing in distinct zones. The porous thin films are fabricated by the post-treatment of layer-by-layer assembled poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA) multilayers. In order to improve the processing efficiency, the deposition time is shortened to approximate to 10 s. It is found that fine porous structures can be created even by significantly reducing the processing time. The effect of using polyelectrolytes with widely different molecular weights is also studied. The pore size is increased by using high molecular weight PAH, while high molecular weight PAA minimizes the pore size to nanometer scale. Having gained a precise control over the pore size, layered multiscale porous thin films are further built up with either a microsized porous zone on top of a nanosized porous zone or vice versa.
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