Solvent-induced microdomain orientation in polystyrene-b-poly(l-lactide) diblock copolymer thin films for nanopatterning

Ho, Rong‐Ming; Tseng, Wen-Hsien; Fan, Huiwen; Chiang, Yun‐Wei; Lin, Chun-Han; Ko, Bao‐Tsan; Huang, Bor-Luen

doi:10.1016/j.polymer.2005.07.069

Cited by 126 publications

(142 citation statements)

References 43 publications

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“…38,39 Block co-polymer molecular weight and polymeric volume fractions were found to directly affect the resultant template pore size and uniformity in the case of the hexagonal cylinder pore morphology 42,47 ; increasing the polymer block molecular weight yielded larger pores with improved homogeneity in pore size. Thus, the formulation or selection of the parent PS-b-PLLA polymer offers an opportunity for tuning the pore morphology and homogeneity in the resultant porous template.…”

Section: Synthesis Of Nanoporous Polymeric Templates From Bcpsmentioning

confidence: 99%

“…38,42,[47][48][49]68 Lines in the figure represent a range of pore sizes or sample sizes. stability.…”

Section: Template-based Fabrication Of Nanoporous Metalsmentioning

confidence: 99%

“…In turn, solvent choice, i.e., solvent selectivity and volatility, has a pronounced effect on the assembled morphology of BCPs. 47 In the case of solution casting, PS-selective solvents (such as chlorobenzene, tetrahydrofuran (THF), and benzene), which more readily dissolve PS than PLLA, were found to induce a favorable BCP nano-assembly whereas neutral solvents did not yield an appreciable polymeric organization. 47 It has been shown that PS-selective solvents with moderate volatilities (such as chlorobenzene with 12 mmHg vapor pressure) yielded more homogeneous nanoscale assemblies than those with high volatility.…”

Section: Synthesis Of Nanoporous Polymeric Templates From Bcpsmentioning

confidence: 99%

“…47 In the case of solution casting, PS-selective solvents (such as chlorobenzene, tetrahydrofuran (THF), and benzene), which more readily dissolve PS than PLLA, were found to induce a favorable BCP nano-assembly whereas neutral solvents did not yield an appreciable polymeric organization. 47 It has been shown that PS-selective solvents with moderate volatilities (such as chlorobenzene with 12 mmHg vapor pressure) yielded more homogeneous nanoscale assemblies than those with high volatility. 47 It can be hypothesized that the pore size uniformity is correlated with the permissible time for assembly before complete evaporation.…”

Section: Synthesis Of Nanoporous Polymeric Templates From Bcpsmentioning

confidence: 99%

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Template-based fabrication of nanoporous metals

Rebbecchi

Chen

2017

J. Mater. Res.

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Nanoporous metallic foams with high surface area and novel functional behavior are positioned to stimulate new multifunctional and metamaterial applications. However, there are fundamental challenges in achieving uniform nanopores and tailorable morphology. Emerging templating methods offer a wide range of applicable metallic species while enhancing control of pore morphology, uniformity, and interconnectivity. Here, a critical review of nanoporous metal fabrication is presented, with focus on templating methods utilizing nanoporous polymeric templates. Metals are introduced into percolative nanochannels of sacrificial templates by deposition, and subsequent removal of templates yields ordered nanoporous metals. We introduce approaches for preparing nanoporous templates, including utilizing block copolymer self-assembly that yields periodic gyroid networks. While metallization of templates by electrodeposition has been demonstrated, electroless deposition permits uniform deposition by many metallic species and infiltration of narrow pores. Examples of nanoporous metals with uniform pore sizes below 50 nm fabricated by templating methods are examined.

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Section: Synthesis Of Nanoporous Polymeric Templates From Bcpsmentioning

confidence: 99%

“…38,42,[47][48][49]68 Lines in the figure represent a range of pore sizes or sample sizes. stability.…”

Section: Template-based Fabrication Of Nanoporous Metalsmentioning

confidence: 99%

Section: Synthesis Of Nanoporous Polymeric Templates From Bcpsmentioning

confidence: 99%

Section: Synthesis Of Nanoporous Polymeric Templates From Bcpsmentioning

confidence: 99%

See 2 more Smart Citations

Template-based fabrication of nanoporous metals

Rebbecchi

Chen

2017

J. Mater. Res.

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“…5,18,19 Some studies have also shown that the orientation of microphase-separated structures can be controlled by exposing block copolymer films to solvent vapor and drying at a controlled evaporation rate. 13,18,[20][21][22][23][24][25][26][27] We have reported the experimental visualization of a threedimensional (3D) helical morphology for a polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock terpolymer (SBM) using transmission electron microtomography (TEMT). 28 The TEMT observations revealed that the double-helical structure was composed of polybutadiene (PB) helical microdomains around hexagonal-packed polystyrene (PS) cylinder cores in a poly(methyl methacrylate) (PMMA) matrix, even though the block copolymer was not chiral.…”

Section: Introductionmentioning

confidence: 99%

Highly oriented and ordered double-helical morphology in ABC triblock terpolymer films up to micrometer thickness by solvent evaporation

Hong

Higuchi

Sugimori

et al. 2012

Polym J

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A triblock terpolymer, polystyrene-block-polybutadiene-block-poly(methyl methacrylate) (SBM), formed a double-helical nanoscale structure, composed of polybutadiene (PB) helical microdomains around hexagonally packed polystyrene (PS) cores in a poly(methyl methacrylate) matrix. The orientation of double-helical morphologies at various film thicknesses were studied using transmission electron microtomography, following solvent annealing and drying at a controlled solvent evaporation rate. The evaporation rate of the solvent and the film thickness were important factors in whether the double-helical microdomains were oriented parallel or perpendicular with respect to the substrate. In some cases, the perpendicularly aligned double-helical morphology extended several micrometers from the substrate to the air surface. A similar experiment using polystyrene-blockpoly(methyl methacrylate) diblock copolymer proved that the presence of helical PB microdomains around PS cylinders is the key factor in achieving a uniform orientation over several micrometers throughout the film thickness.

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Polymer Blends

2017

Polymer Blends and Composites

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Solvent-induced microdomain orientation in polystyrene-b-poly(l-lactide) diblock copolymer thin films for nanopatterning

Cited by 126 publications

References 43 publications

Template-based fabrication of nanoporous metals

Template-based fabrication of nanoporous metals

Highly oriented and ordered double-helical morphology in ABC triblock terpolymer films up to micrometer thickness by solvent evaporation

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