Surface Nanostructures Based on Assemblies of Polymer Brushes

Hou, Wangmeng; Liu, Yingze; Zhao, Hanying

doi:10.1002/cplu.202000112

Cited by 17 publications

(18 citation statements)

References 95 publications

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“…Figure c shows a plot of ln([M] 0 /[M] t ) versus polymerization time. The plot was separated into three stages by two specific points at 5 and 10 h. In a dispersion polymerization, a turning point on a plot of ln([M] 0 /[M] t ) versus polymerization time represents the onset of micellization of the generated BCP in the solution and a change from homogeneous to heterogeneous polymerization. , In this research, with chain extension of PS to a critical length, the PS homopolymer chains and PS brushes collapse on the silica particles, which results in the formation of PS domains and a change from homogeneous RAFT polymerization to heterogeneous surface polymerization. , TEM results (Figure ) indicate that no surface self-assemblies are observed at 5 h, but after that point, surface nanostructures are formed. So the turning point at 5 h represents the onset of surface self-assembly on silica particles.…”

Section: Resultsmentioning

confidence: 99%

“…In previous studies, polymerization-induced surface self-assembly (PISSA) approach was demonstrated to be a versatile procedure for the synthesis of hierarchical surface nanostructures on solid surfaces. − In a typical PISSA process, surface anchored reversible addition–fragmentation chain transfer agent (RAFT CTA) and “free” macro-CTA are used as co-RAFT agents in RAFT-mediated dispersion polymerization. Driven by the minimization of surface energy, the generated “free” block copolymer (BCP) chains and the polymer brushes coassemble into surface nanostructures, and a variety of surface morphologies ranging from isolated spherical surface micelles to fused surface micelles and to layered structures are fabricated.…”

Section: Introductionmentioning

confidence: 99%

“…45,46 In this research, with chain extension of PS to a critical length, the PS homopolymer chains and PS brushes collapse on the silica particles, which results in the formation of PS domains and a change from homogeneous RAFT polymerization to heterogeneous surface polymerization. 35,36 TEM results (Figure 3) indicate that no surface self-assemblies are observed at 5 h, but after that point, surface nanostructures are formed. So the turning point at 5 h represents the onset of surface self-assembly on silica particles.…”

Section: ■ Introductionmentioning

confidence: 99%

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Asymmetric Colloidal Particles Fabricated by Polymerization-Induced Surface Self-Assembly Approach

2021

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In the past decades, the synthesis of asymmetric colloidal particles has been of wide concern in material science because of their anisotropic morphologies and unique properties. However, the synthesis of the asymmetric particles with controllable anisotropy still remains a big challenge because of the lack of effective methods. In this research, polymerization-induced surface self-assembly (PISSA) approach was demonstrated to be an effective method in the synthesis of colloidal particles with tunable asymmetric core–shell structures. Reversible addition–fragmentation chain transfer agents were covalently anchored onto the surfaces of silica particles and coupled onto the ends of methoxy polyethylene glycol (PEG) chains, leading to the synthesis of CTA-modified silica particles (SiO2-CTA) and PEG macro-CTA agents (PEG-CTA), respectively. PISSA process was conducted by using SiO2-CTA and PEG-CTA as co-RAFT agents in RAFT dispersion polymerization of styrene. In the RAFT polymerizations, polymer layers with PS nodules were formed on the surfaces of SiO2 particles. It was demonstrated that the formation of the nodules was related to the production of the PS homopolymer in the PISSA process. In order to control the asymmetric surface structures, RAFT dispersion polymerizations of styrene with added “free” RAFT agents were performed, and it turned out that the eccentrically positioned core–shell structures with silica cores and polymer layers were prepared. The colloidal particles experience morphology changes from surface nodules to snowman-like structures and finally to asymmetric spherical structures, depending on the monomer conversion and the feeding ratio of the co-RAFT agents. Kinetics studies were performed to investigate the mechanism of the formation of the asymmetric particles. After etching the silica cores with HF solution, asymmetric hollow capsules were fabricated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Asymmetric Colloidal Particles Fabricated by Polymerization-Induced Surface Self-Assembly Approach

2021

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“…Polymers prepared by RAFT have been used in many different fields, notably in preparation of biomaterials (implants, scaffolds, coatings, drug, gene delivery, etc. ), [ 226–230 ] sensing and detection, [ 231,232 ] coatings and patterning, [ 233–235 ] electronics, [236] nanocomposite, [ 235,237–240 ] and vitrimers. [ 241 ] One of the most recent and emerging applications of polymers and nanoparticles prepared by RAFT is membranes for separation.…”

Section: Novel Applications Of Raftmentioning

confidence: 99%

Polymerizations by RAFT: Developments of the Technique and Its Application in the Synthesis of Tailored (Co)polymers

Semsarilar

Abetz

2020

Macro Chemistry & Physics

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Reversible addition–fragmentation chain transfer (RAFT) polymerization is an increasingly popular method of controlled radical polymerization and remarkable advances is made in recent years. This polymerization technique offers great chances for more sustainable routes to obtain tailor‐made polymers with high precision. This article may be of interest not only for readers familiar with the technique, but also to newcomers to the field or colleagues, who are looking for more sustainable or safer polymerization techniques to obtain an extensive number of possible polymer structures. After an introduction to RAFT polymerization, different novel paths to carry out RAFT polymerization are discussed in terms of their potential and also advancements in the polymerization technology such as polymerization induced self‐assembly or carrying out the polymerization in continuous flow reactors are highlighted. At the end some upcoming application areas of polymers prepared by RAFT are presented.

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“…Spherical nanoparticles decorated by grafted macromolecules are promising for broad application in diverse high-tech fields, including drug-delivery systems in personal medicine and eco-friendly methods of oil production. − They are the subject of a huge number of experimental, − computer, − and theoretical − studies.…”

Section: Introductionmentioning

confidence: 99%

Flowerlike Multipetal Structures of Nanoparticles Decorated by Amphiphilic Homopolymers

2021

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This paper aims to address nanoparticles decorated by amphiphilic homopolymers composed of monomeric units with significantly different groups. It is shown that the amphiphilic structure of monomer units and the resulting effective surface activity cause the grafted macromolecules to combine into thin layers, which are arranged on a spherical nanoparticle, have a different curvature, and form a multipetal flowerlike structure. The conditions for the formation of multipetal structures are outlined, and the possibility of cascades of transformations with a smooth increase in the petal number and its sharp growth is revealed. The results are presented in the form of structure diagrams obtained in a computer experiment and constructed within the framework of the original analytical theory.

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Surface Nanostructures Based on Assemblies of Polymer Brushes

Cited by 17 publications

References 95 publications

Asymmetric Colloidal Particles Fabricated by Polymerization-Induced Surface Self-Assembly Approach

Asymmetric Colloidal Particles Fabricated by Polymerization-Induced Surface Self-Assembly Approach

Polymerizations by RAFT: Developments of the Technique and Its Application in the Synthesis of Tailored (Co)polymers

Flowerlike Multipetal Structures of Nanoparticles Decorated by Amphiphilic Homopolymers

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