RAFT-mediated polymerization-induced self-assembly (RAFT-PISA): current status and future directions

Wan, Jing; Fan, Bo; Thang, San H.

doi:10.1039/d2sc00762b

Cited by 85 publications

(97 citation statements)

References 316 publications

(499 reference statements)

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“…Next, to introduce emulsifier properties to the macro-RAFT agent, a hydrophobic monomer (BA) is chain-extended with P(AMPSNa 20 - co -DAAM 10 )-TTC to provide amphiphilic macro-RAFT agent P(AMPSNa 20 - co -DAAM 10 )- b -PBA 10 -TTC in an approach that is part of the concept of polymerization-induced self-assembly (PISA). − Overall, this strategy allows not only the preparation of amphiphilic macro-RAFT agent with cross-linking function but also the production of latexes in complete aqueous formulations, which are more favorable for industrial applications.…”

Section: Resultsmentioning

confidence: 99%

Nanoparticle Surface Cross-Linking: A Universal Strategy to Enhance the Mechanical Properties of Latex Films

Fan

Putera

et al. 2022

Macromolecules

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Keto-hydrazide cross-linking chemistry between diacetone acrylamide (DAAM) and adipic acid dihydrazide (ADH) has been widely applied in conventional emulsion polymerization to render materials with specific chemical and physical properties. However, significant drawbacks are usually associated with the conventional process, such as the migration of low-molar-mass surfactants, and the low cross-linking efficiency due to the random distribution of the cross-linkers throughout the nanoparticles. We demonstrate here the concept of surface crosslinking of latexes in a RAFT-mediated surfactant-free procedure that overcomes the migration of surfactants while improving the cross-linking efficiency of latexes. Specifically, the "surface crosslinking" here refers to the cross-linking of colloidal particles' surfaces during the film formation process. First, an amphiphilic RAFT agent with the incorporation of a cross-linking unit (DAAM) was designed and synthesized; the following controlled emulsion polymerizations provide a series of surfactant-free latexes with excellent colloidal stabilities, high solid contents (>40.0 wt %), and a size range of 150−250 nm. To access RAFT latexes with different cross-linking degrees and mechanisms, amphiphilic RAFT agents with different units of cross-linking component (DAAM) were designed and implemented for the controlled emulsion polymerization of styrene and n-butyl acrylate. Next, the surface crosslinkable and randomly cross-linkable RAFT latexes and corresponding films were prepared. It was found that the surface cross-linked films exhibited not only improved Young's modulus and storage modulus but also better solvent resistance compared to the control group with DAAM units randomly distributed throughout the particle systems. Remarkably, it was noticed that the surface crosslinking process can simultaneously increase the strain at break and ultimate stress, and this is the first observation of such a phenomenon in DAAM/ADH cross-linked latex films. Overall, this study represents the first attempt that combines surfactant-free RAFT-mediated emulsion polymerization with the surface cross-linking chemistry to produce cohesive films with enhanced and tunable mechanical properties. This universal synthetic strategy is applicable to a broad range of commercial monomers and can be used as a platform technology for advanced industrial applications.

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Section: Resultsmentioning

confidence: 99%

Nanoparticle Surface Cross-Linking: A Universal Strategy to Enhance the Mechanical Properties of Latex Films

Fan

Putera

et al. 2022

Macromolecules

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“…[20][21][22][23][24][25][26][27][28] PISA is a process that combines polymerization and self-assembly in a single step with distinct efficiency; it allows the preparation of polymer particles such as micelles, worms and vesicles with a facile control over their sizes and morphologies. 29,30 Nonetheless, the preparation of polymer cubosomes and hexosomes through PISA has been demonstrated to be extremely challenging, and only a few groups, including our group, have recently demonstrated the possibility of preparing complex polymer cubosomes and hexosomes using PISA. [31][32][33][34][35] So far, no efforts have been devoted to developing polymer particles with complex inverse cubic phases and at the same time exhibiting fluorescence emission via the efficient PISA process.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent polymer cubosomes prepared by RAFT-mediated polymerization-induced self-assembly

et al. 2022

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“…Besides, the morphologies of nanoparticles can be facilely controlled via manipulating the polymerization degree and solid content, leading to fruitful and diversiform nanostructures. [29][30][31][32] Even more exciting, aqueous PISA without a single organic solvent has been exploited to prepare functional BCP nanoparticles, which is especially critical for practical clinical use. 33 Usually, the key to achieving the PISA process in water lies in the structure of monomers, which should possess considerable aqueous solubility, while their polymer block extended from another water soluble block becomes insoluble during the polymerization process, leading to the generation of BCP nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Pyridine-containing block copolymeric nano-assemblies obtained through complementary hydrogen-bonding directed polymerization-induced self-assembly in water

Ren

Wei

et al. 2022

Polym. Chem.

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RAFT-mediated polymerization-induced self-assembly (RAFT-PISA): current status and future directions

Abstract: Polymerization-induced self-assembly (PISA) combines polymerization and self-assembly in a single step with distinct efficiency that has set it apart from the conventional solution self-assembly processes. PISA holds great promise for...

Cited by 85 publications

References 316 publications

Nanoparticle Surface Cross-Linking: A Universal Strategy to Enhance the Mechanical Properties of Latex Films

Nanoparticle Surface Cross-Linking: A Universal Strategy to Enhance the Mechanical Properties of Latex Films

Photoluminescent polymer cubosomes prepared by RAFT-mediated polymerization-induced self-assembly

Pyridine-containing block copolymeric nano-assemblies obtained through complementary hydrogen-bonding directed polymerization-induced self-assembly in water

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