scholarly journals Surfactant-Free RAFT Emulsion Polymerization of Styrene Using Thermoresponsive macroRAFT Agents: Towards Smart Well-Defined Block Copolymers with High Molecular Weights

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 668 ◽  
Author(s):  
Steffen Eggers ◽  
Volker Abetz
Keyword(s):  
Block Copolymers ◽  
Emulsion Polymerization ◽  
Molecular Weights

scholarly journals Synthesis of double-responsive magnetic latex particles via seeded emulsion polymerization using macroRAFT block copolymers as stabilizers

2020 ◽  
Vol 11 (3) ◽  
pp. 648-652 ◽  
Author(s):  
Thiago Rodrigues Guimarães ◽  
Muriel Lansalot ◽  
Elodie Bourgeat-Lami
Keyword(s):  
Block Copolymers ◽  
Emulsion Polymerization ◽  
Magnetic Response ◽  
Seeded Emulsion Polymerization ◽  
Latex Particles ◽  
Magnetic Carriers

We report the synthesis of magnetic latex particles decorated with double-responsive PDMAEMA segments with fast magnetic response via RAFT-assisted emulsion polymerization, highlighting this strategy as a powerful tool for magnetic carriers design.

Amphiphilic Block Copolymers as Stabilizers in Emulsion Polymerization: Effects of the Anchoring Block Molecular Weight Dispersity on Stabilization Performance

2016 ◽  
Vol 50 (1) ◽  
pp. 315-323 ◽  
Author(s):  
Sean R. George ◽  
Rachel Champagne-Hartley ◽  
Gary A. Deeter ◽  
J. D. Campbell ◽  
Bernd Reck ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Emulsion Polymerization ◽  
Amphiphilic Block Copolymers

Preparation of amphiphilic block copolymers (polyethylene adipate-block-polyethylene glycol) and its application in rotogravure ink formulations

2018 ◽  
Vol 47 (5) ◽  
pp. 415-423 ◽  
Author(s):  
Yasser Assem ◽  
Heba A. Mohamed ◽  
Rana Said ◽  
Ahmed El-Masry
Keyword(s):  
Optical Properties ◽  
Polyethylene Glycol ◽  
Block Copolymers ◽  
Ethylene Glycol ◽  
Adipic Acid ◽  
Amphiphilic Block Copolymers ◽  
Synthesis Process ◽  
Gravimetric Analysis ◽  
Content Type ◽  
Molecular Weights

Purpose The purpose of this paper is to prepare amphiphilic block copolymers polyethylene adipate-block-polyethylene glycol (PEA-b-PEG)s and study their performance as plasticizers in rotogravure ink formulations. Design/methodology/approach Series of amphiphilic block copolymers (PEA-b-PEG1), (PEA-b-PEG2), (PEA-b-PEG3), (PEA-b-PEG4) and (PEA-b-PEG5) were prepared by the reaction of adipic acid, ethylene glycol and polyethylene glycol of different molecular weights (300, 1,000, 2,000, 10,000 and 20,000 g/mol), respectively. Full characterization of the prepared copolymers was achieved using Fourier Transfer Infrared Spectroscopy (FTIR), 1H NMR, thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The performance of the prepared copolymers as plasticizers for neat nitrocellulose resin were studied in different formulations, namely, R1, R2, R3, R4 and R5 containing copolymers (PEA-b-PEG1), (PEA-b-PEG2), (PEA-b-PEG3), (PEA-b-PEG4) and (PEA-b-PEG5), respectively. In addition to formula R0 that contains acetyl tributyl citrate (ATBC) as a commercial plasticizer. The mechanical properties, thermal analysis (DSC, TGA) and optical properties of the prepared formulations films were investigated. Theses amphiphilic block copolymers were then applied as plasticizers in different rotogravure ink formulations (F1, F2, F3, F4 and F5) and compared with commercial rotogravure ink formula (F0). The color measurements and optical properties of all formulations were achieved. Findings It was found that the performance of the prepared copolymers as plasticizers in different formulations based on nitro cellulose resin gives better gloss, adhesion for R1 compared with the other samples and color strength for F1 compared with F0. Finally, all the samples gave excellent plasticizing effect. Research limitations/implications The authors believe that type of these materials open the way for a new class of plasticizers that upon application or even degradation gives small ecofriendly molecules (adipic acid and or ethylene glycol moieties) taking into consideration the simplicity of the rout of the synthesis process. Practical implications The prepared ecofriendly (PEA-b-PEG)s could be successfully used as plasticizers instead of commercial plasticizer ATBC. Originality/value The research provides that the prepared (PEA-b-PEG)s with different molecular weights can act as plasticizers in rotogravure ink formulations, and their performance was acceptable and available.

scholarly journals Effect of Oxygen and Initiator Solubility on Admicellar Polymerization of Styrene on Silica Surfaces

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Pohlee Cheah ◽  
Caitlin N. Bhikha ◽  
John H. O’Haver ◽  
Adam E. Smith
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Emulsion Polymerization ◽  
Water Soluble ◽  
Polymer Yield ◽  
Radical Initiator ◽  
Admicellar Polymerization ◽  
Molecular Weights ◽  
Precipitated Silica ◽  
Free Radical Initiator

Although admicellar polymerization has been termed the surface analog of emulsion polymerization, previous reports utilizing free radical-initiated admicellar polymerization relied on high levels of the free radical initiator when compared to emulsion polymerization, likely due to the presence of oxygen in the reported admicellar polymerization systems. Admicellar polymerizations of styrene on the surface of precipitated silica initiated by either a water-soluble or a water-insoluble initiator were studied to determine the effect of dissolved oxygen and free radical initiator solubility on the kinetics, yield, and molecular weight of the polymer formed. Results show that the presence of oxygen reduces the polymer yield and limits molecular weight. The solubility of the initiator also affected the polymer formed in the admicellar polymerization of styrene. While monomer conversions and polymer yield were similar, the molecular weights of polymerizations initiated by a water-soluble initiator were higher than comparable polymerizations initiated by a water-insoluble initiator.

Block copolymers as polymeric stabilizers in non-aqueous emulsion polymerization

2011 ◽  
Vol 60 (11) ◽  
pp. 1563-1573 ◽  
Author(s):  
Leonard-I. Atanase ◽  
Gérard Riess
Keyword(s):  
Block Copolymers ◽  
Emulsion Polymerization ◽  
Aqueous Emulsion

A model for molecular weights in vinyl acetate emulsion polymerization

AIChE Journal ◽  
1988 ◽  
Vol 34 (5) ◽  
pp. 840-848 ◽  
Author(s):  
Chan H. Lee ◽  
Richard G. Mallinson
Keyword(s):  
Emulsion Polymerization ◽  
Vinyl Acetate ◽  
Molecular Weights

scholarly journals Phosphonium-containing diblock copolymers from living anionic polymerization of 4-diphenylphosphino styrene

2016 ◽  
Vol 52 (5) ◽  
pp. 950-953 ◽  
Author(s):  
Alison R. Schultz ◽  
Gregory B. Fahs ◽  
Chainika Jangu ◽  
Mingtao Chen ◽  
Robert B. Moore ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Anionic Polymerization ◽  
Diblock Copolymers ◽  
Living Anionic Polymerization ◽  
Molecular Weights

Living anionic polymerization of 4-diphenylphosphino styrene (DPPS) achieved well-defined homopolymers, poly(DPPS-b-S) styrenic block copolymers, and poly(I-b-DPPS) diene-based diblock copolymers with predictable molecular weights and narrow polydispersities.

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