Pyridine-functional diblock copolymer nanoparticles synthesized <i>via</i> RAFT-mediated polymerization-induced self-assembly: effect of solution pH

Wen, Shang-Pin; Fielding, Lee A.

doi:10.1039/d1sm01793d

Cited by 7 publications

(12 citation statements)

References 69 publications

(91 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The preparation of V x -B y latexes via RAFT-mediated PISA using P2VP as a macro-CTA has recently been discussed in detail by our group. 37 Briefly, V x -B y diblock copolymer nanoparticles with controllable particle diameters can be obtained via RAFT emulsion polymerization using the same target copolymer composition at varying solution pH. Herein, two V x -B 300 latexes with the same core-forming PBzMA block target degree of polymerization (DP) and different P2VP chain lengths were prepared.…”

Section: Resultsmentioning

confidence: 99%

“…These observations can be attributed to the relatively high ionic strength (K + and Cl – ) generated from the solution pH (HCl and KOH) and background electrolyte (KCl) inducing particle flocculation. 37 Briefly, at high pH, the degree of protonation of the P2VP stabilizer decreases, resulting in a weaker positive charge and lower electrostatic repulsion among particles. Furthermore, the relatively high ionic strength screens any residual electrostatic repulsion and induces flocculation, 44 , 45 resulting in the large particle diameters reported by DLS analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Anionic poly(potassium 3-sulfopropyl methacrylate)-poly(benzyl methacrylate) (PKSPMA–PBzMA), nonionic poly(benzyl methacrylate) (PBzMA), cationic poly(2-vinylpyridine)-poly(benzyl methacrylate) (P2VP–PBzMA), and cationic PEGMA-stabilized P2VP latexes were prepared in-house according to previously reported protocols. − For the sake of brevity, a shorthand label is used throughout this manuscript: PEGMA-stabilized P2VP and P2VP x -PBzMA y latexes are denoted as “PEGVP” and “V x -B y ,” respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Herein, the preparation of polymer/GO nanocomposite particles via electrostatically induced heteroflocculation is reported (Scheme ). Specifically, a cationic poly(ethylene glycol) methacrylate (PEGMA)-stabilized P2VP latex , and P2VP-stabilized poly(benzyl methacrylate) (PBzMA) latexes were synthesized via conventional and RAFT emulsion polymerization, respectively. Polymer/GO nanocomposite particles were prepared via heteroflocculation at room temperature by mixing these positively charged latex nanoparticles and the negatively charged GO nanosheets.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Physical Adsorption of Graphene Oxide onto Polymer Latexes and Characterization of the Resulting Nanocomposite Particles

et al. 2022

Self Cite

View full text Add to dashboard Cite

Polymer/graphene oxide (GO) nanocomposite particles were prepared via heteroflocculation between 140–220 nm cationic latex nanoparticles and anionic GO nanosheets in either acidic or basic conditions. It is demonstrated that nanocomposite particles can be formed using either poly(2-vinylpyridine)- b -poly(benzyl methacrylate) (P2VP–PBzMA) block copolymer nanoparticles prepared by reversible-addition chain-transfer (RAFT)-mediated polymerization-induced self-assembly (PISA), or poly(ethylene glycol)methacrylate (PEGMA)-stabilized P2VP latexes prepared by traditional emulsion polymerization. These two latexes are different morphologically as the P2VP–PBzMA block copolymer latexes have P2VP steric stabilizer chains in their corona, whereas the PEGMA-stabilized P2VP particles have a P2VP core and a nonionic steric stabilizer. Nevertheless, both the P2VP–PBzMA and PEGMA-stabilized P2VP latexes are cationic at low pH. Thus, the addition of GO to these latexes causes flocculation to occur immediately due to the opposite charges between the anionic GO nanosheets and cationic latexes. Control heteroflocculation experiments were conducted using anionic sterically stabilized poly(potassium 3-sulfopropyl methacrylate)- b -poly(benzyl methacrylate) (PKSPMA–PBzMA) and nonionic poly(benzyl methacrylate) (PBzMA) nanoparticles to demonstrate that polymer/GO nanocomposite particles were not formed. The degree of flocculation and the strength of electrostatic interaction between the cationic polymer latexes and GO were assessed using disc centrifuge photosedimentometry (DCP), transmission electron microscopy (TEM), and UV–visible spectrophotometry. These studies suggest that the optimal conditions for the formation of polymer/GO nanocomposite particles were GO contents between 10% and 20% w/w relative to latex, with the latexes containing P2VP in their corona having a stronger electrostatic attraction to the GO sheets.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physical Adsorption of Graphene Oxide onto Polymer Latexes and Characterization of the Resulting Nanocomposite Particles

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Considering that pyridine is structurally sensitive to acid, 49 the pH effect on the obtained PEG-PMPA polymers was investigated. As shown in Fig.…”

Section: Ph-responsive Properties Of Peg-pmpamentioning

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.

View full text Add to dashboard Cite

show abstract

Kinetic Modeling of the Synthesis of Poly(4-vinylpyridine) Macro-Reversible Addition-Fragmentation Chain Transfer Agents for the Preparation of Block Copolymers

Kandelhard

Pashayev

Schymura

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Reversible addition-fragmentation chain transfer (RAFT) polymerization is one of the most common controlled polymerization techniques to prepare well-defined, rather narrow dispersed polymers due to reduced demands in reactant preparation. Despite these advantages, RAFT polymerization was so far primarily utilized on small laboratory scales. This study presents a first step to a scaled-up RAFT polymerization by developing and experimentally validating a kinetic model on the example of the polymerization of 4-vinylpyridine (4VP), which to date is not described in the literature. With the implementation of the results from modeling, the synthesis process was extended to a medium scale (from 6 to 36 g), while the same high conversions, molar mass, and low dispersity as in the smaller scale were achieved. The process is also optimized regarding the high degree of livingness necessary for using the 4VP polymers as a macro-RAFT agent in the subsequent reaction step for the synthesis of poly(4-vinylpyridine)-b-polystyrene diblock copolymers by RAFT dispersion polymerization.

show abstract

Pyridine-functional diblock copolymer nanoparticles synthesized via RAFT-mediated polymerization-induced self-assembly: effect of solution pH

Abstract: Polymerization-induced self-assembly (PISA) via reversible addition-fragmentation chain transfer (RAFT) polymerization has become widely recognized as a versatile and efficient strategy to prepare complex block copolymer nanoparticles with controlled morphology, size,...

Cited by 7 publications

References 69 publications

Physical Adsorption of Graphene Oxide onto Polymer Latexes and Characterization of the Resulting Nanocomposite Particles

Physical Adsorption of Graphene Oxide onto Polymer Latexes and Characterization of the Resulting Nanocomposite Particles

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

Kinetic Modeling of the Synthesis of Poly(4-vinylpyridine) Macro-Reversible Addition-Fragmentation Chain Transfer Agents for the Preparation of Block Copolymers

Contact Info

Product

Resources

About