Phase Behavior of Polystyrene-block-Poly(n-butyl-ran-n-hexyl) Methacrylate Copolymers

Moon, Hong Chul; Han, Sang Hyun; Kim, Jin Kon; Li, Guang Hua; Cho, Junhan

doi:10.1021/ma800645u

Cited by 20 publications

(24 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Block copolymers (BCPs) have been widely studied because of their self-assembled nature into various periodic nanoscale structures, for instance, lamellae, cylinders, spheres, and gyroids. − Particularly, when metal precursors are coordinated with one of the blocks in BCP, such as poly(2-vinylpyridine) (P2VP), poly(4-vinylpyridine) (P4VP), or poly(ethylene oxide), these can be used for fabrication of a 2D metal nanopattern, − nanoporous structures, , photonic − and memory devices, , and cell adhesion . In addition, metal oxide nanostructures are easily prepared by sequential infiltration synthesis (SIS) − when metal oxide precursors are interacting with one of the microdomains in block copolymers.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Nanoporous Metal Structures from Poly(2-vinylpyridine)-block-Poly(4-vinylpyridine) Copolymer Thin Film

Lee

Mishra

Choi

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

We fabricated 3D nanoporous metal structures from poly(2vinylpyridine)-block-poly(4-vinylpyridine) copolymer (P24VP) thin film with vertically oriented lamellar nanodomains by coordinating corresponding metal precursors followed by reduction to metals. Although metal precursors are coordinated with both P2VP and P4VP blocks, the metal coordination power toward P4VP block is much greater than that toward P2VP block. Thus, most of the metal precursors are located in the P4VP block, while a few exist in the P2VP block. After the metal precursors were reduced to corresponding metals by reactive ion etching, metals located in P4VP regions became continuous main frames. However, metals in P2VP regions could not be continuous because of smaller amounts, resulting in nanoporous structures. Using these 3D nanoporous structures, we measured the electrocatalytic activity for hydrogen evolution reaction. 3D nanoporous platinum (Pt) showed enhanced catalytic activity compared with Pt flat film due to the large surface area. Moreover, 3D nanoporous Pt/cobalt bimetallic structures showed better catalytic activity than 3D nanoporous Pt structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Nanoporous Metal Structures from Poly(2-vinylpyridine)-block-Poly(4-vinylpyridine) Copolymer Thin Film

Lee

Mishra

Choi

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…The difference in T g and the pressure-induced miscibility of the two components made the polymer capable of transforming from an ordered state to a disordered state under pressure even at a temperature lower than its melting point. Thus, they could be processed at a relatively low temperature, that is, room temperature under a certain pressure and called baroplastics. − Because of the low-temperature processing, baroplastics have a very low chance to degrade and can be remolded many times and meanwhile show almost the same properties as the first molded specimens. However, despite their advantage of low-temperature processing, baroplastics have a notable shortcoming, that is, low mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Baroplastics with Robust Mechanical Properties and Reserved Processability through Hydrogen-Bonded Interactions

Qiao

Song

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Conventional polymers are usually processed at a much higher temperature than room temperature, which inevitably leads to huge energy consumption and degradation of the polymers and thus a low recycling ability. Herein, we synthesized a poly(nbutyl acrylate)@polystyrene (PBA@PS) core−shell polymer to prepare a typical baroplastic (processible at room temperature). However, this type of baroplastics always has a low mechanical property. To solve this problem, in this work, we introduced hydrogen bonds into the matrix and successfully reinforced baroplastics for the first time. The hydrogen-bonded interaction was introduced by complexing PBA@PS with poly(acrylic acid) and poly(ethylene oxide). The results show that the reinforced baroplastics possessed notably enhanced mechanical properties and good processability. Their mechanical strength and modulus reached as high as 5.6 (by 73%) and 10 MPa (by 400%), respectively. Moreover, the baroplastics could be remolded many times at room temperature and, at the same time, still showed a higher tensile strength (10.5 MPa, 3.3 times that of the initial PBA@PS, which was never achieved in previous works), which resulted from the reversible hydrogen bonds and reserved orientation of molecular chains. Our work opened a new path to reinforce baroplastics and could widen their applications. Furthermore, not limited to the hydrogen bonds, more sacrificial bonds, such as ionic bonds, host−guest interactions, and metal−ligand coordination bonds, could be used to fabricate high-performance baroplastics.

show abstract

“…Block copolymers have been extensively studied due to their self-assembled nature into various periodic nanoscale structures. − Among many block copolymers, poly(2-vinylpyridine) (P2VP) or poly(4-vinylpyridine) (P4VP) containing block copolymers have received great attention − due to their easy inclusion of nanoparticles, nanofibers, photonic band gap, and plasmonic materials . When nanoparticles are incorporated into a block copolymer, the microdomain structures change dramatically.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior of Poly(2-vinylpyridine)-block-Poly(4-vinylpyridine) Copolymers Containing Gold Nanoparticles

et al. 2017

Self Cite

View full text Add to dashboard Cite

We studied the phase behavior of the poly(2-vinylpyridine)-blockpoly(4-vinylpyridine) copolymer (P24VP) containing gold nanoparticles, by rheometry, small-angle X-ray scattering, transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). Although both blocks of P24VP exhibited attractive interaction to gold precursors, unusual phase behavior was observed depending on the amount of gold nanoparticles. As the amount of gold nanoparticles increased, the order-to-disorder transition temperature (T ODT ) of P24VP with gold nanoparticles decreased first, then increased, and finally decreased again. To explain this phenomenon, we prepared two block copolymers: polystyrene-block-poly(2vinylpyridine) copolymer (PS2VP) and polystyrene-block-poly(4-vinylpyridine) copolymer (PS4VP) containing gold nanoparticles. With increasing the amount of gold particles, the T ODT of PS2VP increased continuously, whereas that of PS4VP gradually decreased. For PS4VP containing gold nanoparticles, because P4VP chains can interact with the gold nanoparticle surface, density fluctuations exist near the gold nanoparticle surfaces, which causes the T ODT to decrease. On the other hand, although the pyridine ring in P2VP could be associated with the gold surface, P2VP chains become stretched due to steric hindrance arising from the ortho position of nitrogen in P2VP. The chain stretching increases the T ODT. Thus, the decrease of T ODT for P24VP originates from P4VP microdomains containing gold nanoparticles, while the increase of T ODT is attributed to the P2VP microdomains containing gold nanoparticles. With increasing the amounts of gold nanoparticles, the contribution of P4VP microdomains containing gold nanoparticles on the T ODT becomes dominant, causing the T ODT to redecrease. To verify the gold nanoparticle position in both P2VP and P4VP microdomains, we performed TEM and scanning transmission electron microscopy (STEM) experiments. At lower amounts of gold nanoparticles, they are mainly located inside P4VP microdomains. With increasing the amount of the gold nanoparticles, they are distributed in both P2VP and P4VP microdomains, though the amount of gold nanoparticles in P4VP microdomains is larger than that in P2VP microdomains.

show abstract

Phase Behavior of Polystyrene-block-Poly(n-butyl-ran-n-hexyl) Methacrylate Copolymers

Cited by 20 publications

References 39 publications

Three-Dimensional Nanoporous Metal Structures from Poly(2-vinylpyridine)-block-Poly(4-vinylpyridine) Copolymer Thin Film

Three-Dimensional Nanoporous Metal Structures from Poly(2-vinylpyridine)-block-Poly(4-vinylpyridine) Copolymer Thin Film

Baroplastics with Robust Mechanical Properties and Reserved Processability through Hydrogen-Bonded Interactions

Phase Behavior of Poly(2-vinylpyridine)-block-Poly(4-vinylpyridine) Copolymers Containing Gold Nanoparticles

Contact Info

Product

Resources

About