Preparation and Morphology Control of Highly Ordered Nanoporous Films from Block Copolymers

Yuan-yuan Liu; He-wei Tang; Qian Li; Xiao-lin Wang

doi:10.11777/j.issn1000-3304.2015.14338

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Preparation and Morphology Control of Highly Ordered Nanoporous Films from Block Copolymers

Research Article | 更新时间：2021-03-19

- Preparation and Morphology Control of Highly Ordered Nanoporous Films from Block Copolymers
- Acta Polymerica Sinica Issue 4, Pages: 466-474(2015)
- 作者机构：
  
  清华大学化学工程系膜材料与工程北京市重点实验室,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2015.14338
  CLC：
- Published：20 April 2015，
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Yuan-yuan Liu, He-wei Tang, Qian Li, Xiao-lin Wang. Preparation and Morphology Control of Highly Ordered Nanoporous Films from Block Copolymers. [J]. Acta Polymerica Sinica (4):466-474(2015)
DOI：

Yuan-yuan Liu, He-wei Tang, Qian Li, Xiao-lin Wang. Preparation and Morphology Control of Highly Ordered Nanoporous Films from Block Copolymers. [J]. Acta Polymerica Sinica (4):466-474(2015) DOI： 10.11777/j.issn1000-3304.2015.14338.

摘要

通过结合嵌段共聚物自组装与非溶剂致相分离法

制备了上表面为高规整纳米直孔薄层

内部为双连续大孔支撑层的非对称薄膜结构

并考察了铸膜液浓度、溶剂挥发时间、凝固浴温度、刮膜厚度等因素对膜形貌的影响

实现对表面结构的有效调控.研究表明铸膜液浓度与挥发时间的影响有协同效应

随着铸膜液浓度的升高

规整表面孔结构所需的挥发时间减小.若铸膜液浓度不变

挥发时间的增大可使膜表面依次完成从非规整孔、规整柱状孔

再到层状孔的转变.凝固浴温度的降低有利于规整表面结构的形成.当刮膜厚度降低时

原有操作条件下的膜表面形貌形成规律将不再适用

为制备更薄的规整纳米多孔薄膜

需降低挥发时间或采用溶剂退火的方法

这一发现扩展了此类新型薄膜材料制备过程的可操作空间.

Abstract

This work demonstrated the combination of the self-assembly of a block copolymer with the well-established non-solvent induced phase separation process.Nanoporous films were obtained with well-ordered cylinder pores perpendicular to the film surfaces on top of a non-ordered bicontinous porous layer.Numerous parameters during the film formation process

including the concentration of casting solution

the solvent evaporation time

the temperature of precipitation bath

and the gate height of doctor blade

were systematically investigated to realize the effective control of surface morphology.Voronoi tessellation was first introduced to quantitatively describe the regularity of the surface pattern.It was found that the concentration of casting solution and the solvent evaporation time have synergetic influences on the porous structures.With the increase of concentration

the minimum evaporation time needed for a well-ordered porous surface decreases.If keep the concentration as a constant

the evolution of surface morphologies from non-ordered cylinder pores to ordered cylinder pores

and then to lamellar pores

was observed with the increase of evaporation time.Although lots of combinations of these two parameters can be utilized for the well-ordered structure formation

the mean pore size of the film surface didn't change significantly with the change of film preparation conditions.Besides

the decrease of the temperature of precipitation bath also helped to improve surface pattern regularity.Further study revealed that once the gate height of casting solution was decreased

the evaporation of solvent induced more significant change of casting solution concentration and the solvent composition

resulting in the disappearance of well-ordered cylinder pores.Two ways

including decreasing the solvent evaporation time and applying the solvent annealing process

were proven to be very effective to prepare thinner films with well-ordered nanoporous structures.The above results greatly broaden the operation window and provide possibilities to fabricate films suitable for different applications.

关键词

嵌段共聚物自组装非溶剂致相分离规整纳米多孔薄膜

Keywords

Block copolymerSelf-assemblyNon-solvent induced phase separationOrdered nanoporous films

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Related Institution

College of Chemistry and Chemical Engineering, Taishan University

School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, State Key Laboratory of Coordination Chemistry and Collaborative Innovation Center of Chemistry for Life Sciences, Nanjing University

Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China of University of Science and Technology

State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology

Department of Polymer Science and Engineering, University of Massachusetts, Amherst

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