Functional styrenic copolymer based on 2-(dimethylamino)ethyl methacrylate: Reactivity ratios, biological activity thermal properties and semi-conducting properties

Erol, İbrahi̇m; Şahin, Bihter

doi:10.1016/j.jfluchem.2015.07.002

Cited by 17 publications

(12 citation statements)

References 40 publications

(29 reference statements)

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“…The reactivity ratio of DMD ( r DMD ) increased from 0.42 for CPDA to 0.93 for TPDA, whereas the reactivity ratio of AM ( r AM ) decreased from 5.62 for CPDA to 3.84 for TPDA. These changes implied that the homopolymerization ability of DMD increased and that of AM declined . When two monomer reactivity ratios are both greater than 1 in the binary polymerization, the reaction can be considered to be block copolymerization, which generates a block structure in the polymer molecular chain .…”

Section: Resultsmentioning

confidence: 99%

“…These changes implied that the homopolymerization ability of DMD increased and that of AM declined. 26 When two monomer reactivity ratios are both greater than 1 in the binary polymerization, the reaction can be considered to be block copolymerization, which generates a block structure in the polymer molecular chain. 27 In this study, r DMD and r AM were respectively 0.93 and 3.84 after template addition, which nearly met the requirement of block polymerization.…”

Section: Resultsmentioning

confidence: 99%

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Template Polymerization of a Novel Cationic Polyacrylamide: Sequence Distribution, Characterization, and Flocculation Performance

Zhang

Zheng²,

Huang³

et al. 2016

Ind. Eng. Chem. Res.

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In this study, the template polymer (TPDA) of dimethyldiallylammonium chloride (DMD) and acrylamide (AM) was synthesized with UV-initiated template polymerization. The reactivity ratio, Fourier transform infrared spectroscopy, 1 H NMR spectroscopy, and thermogravimetric analysis were employed to characterize the TPDA properties. The results revealed that the addition of template sodium polyacrylate improved the reactivity ratio of DMD and increased the number and length of DMD segments in polymer molecules. The results of flocculation tests demonstrated that the DMD block structure improved the flocculation performance of TPDA, especially charge neutralization. In the optimal conditions of a TPDA dose of 9.0 mg•L −1 and a wastewater pH of 5.0−7.0, the residual concentration of suspended solids in a supernatant of coal mine wastewater reached the lowest value of approximately 20.04 mg•L −1 . The TPDA flocs were large, compact, rapid to settle, and difficult to restabilize.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Template Polymerization of a Novel Cationic Polyacrylamide: Sequence Distribution, Characterization, and Flocculation Performance

Zhang

Zheng²,

Huang³

et al. 2016

Ind. Eng. Chem. Res.

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“…One of the ways to estimate the monomer distribution of a copolymer chain is to determine monomer reactivity ratios (MRRs) via diverse linear least-squares methods including the Finemann-Ross (FR), inverted FR and Kelen-Tudos (KT) methods. [39][40][41][42][43][44][45] In this study, MRRs of poly(SS-co-AMPS), and poly(SPA-co-AMPS) were determined (see Figure 2). The data fit best for the FR method (R 2 ≥ 0.92) although the reactivity ratios determined using the inverted FR and KT methods still predicted the same type of monomer distribution (data not shown).…”

Section: Monomer Reactivity Ratiosmentioning

confidence: 99%

Sulfonated RAFT Copolymers as Heparin Mimetics: Synthesis, Reactivity Ratios, and Anticoagulant Activity

Al-Nahain

Ignjatović

Monagle

et al. 2020

Macromolecular Bioscience

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The glycosaminoglycan heparin is a clinically important anticoagulant drug, primarily used to reduce the risk of blood clots (thrombosis) during surgery. Despite its importance in medicine and its continuous use over many decades, heparin suffers from several limitations associated with its heterogeneity and its extraction from animal tissues. In order to address these limitations, reversible addition‐fragmentation chain transfer polymerization is utilized to prepare a library of heparin mimetic copolymers from the sulfonated monomers sodium 4‐styrene sulfonate, potassium‐3‐sulfopropyl acrylate, potassium‐3‐sulfopropyl methacrylate, and sodium‐2‐acrylamido‐2‐methyl‐1‐propane sulfonate. Copolymers are prepared using combinations of two different monomers in various ratios. Monomer reactivity ratios are also determined for some representative monomer combinations, and all polymers are characterized by 1H NMR spectroscopy and gel permeation chromatography. The anticoagulant activities of the copolymers are determined by activated partial thromboplastin time and thrombin clotting time assays and structure–activity relationships are explored.

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“…In PAD copolymerization, r AM and r DMC were both lower than 1, which indicated the monomer copolymerization ability was stronger than that of homopolymerization [26]. Therefore, monomers inclined to copolymerize disorderly, forming shorter chain segments of same units in polymer molecule.…”

Section: Resultsmentioning

confidence: 99%

“…The reactivity ratios of AM and cationic monomers calculated according to three methods are shown in Table 3 and the results were close to those of the previous study. In PAD copolymerization, r AM and r DMC were both lower than 1, which indicated the monomer copolymerization ability was stronger than that of homopolymerization [ 26 ]. Therefore, monomers inclined to copolymerize disorderly, forming shorter chain segments of same units in polymer molecule.…”

Section: Resultsmentioning

confidence: 99%

Improvement of Sludge Dewaterability by Ultrasound-Initiated Cationic Polyacrylamide with Microblock Structure: The Role of Surface-Active Monomers

et al. 2017

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Cationic polyacrylamides have been employed widely to improve sludge dewatering performance, but the cationic units are randomly distributed in the molecular chain, which restricts the further enhancement of dewaterability. Common template technology to prepare block copolymers requiring a huge number of templates reduces the polymer purity and molecular weight. Here, we adopted the surface-active monomer benzyl dimethyl 2-(methacryloyloxy)ethyl ammonium chloride (BDMDAC) to synthesize cationic microblocky polyacrylamide initiated by ultrasound. The reactivity ratio of monomers suggested that novel cationic monomer BDMDAC had higher homopolymerization ability, and was thus more prone to forming a microblock structure. The statistical analysis of sequence-length distribution indicated that the number and length of cationic segments increased in the PAB molecules. In addition, the characteristic results of Fourier transform infrared (FTIR), proton nuclear magnetic resonance (1H NMR), and thermogravimetric analysis (TGA) provided evidence for the synthesis of copolymer with cationic microblocks. Finally, the results of dewatering tests demonstrated that sludge dewaterability was greatly improved by adding the synthesized novel flocculants, and the sludge-specific resistance to filtration, filter cake moisture content and residual turbidity all reached a minimum (68.7%, 5.4 × 1012 m·kg−1, and 2.6 NTU, respectively) at 40 mg·L−1. The PAB flocs were large, compact, difficult to break, and easy to regrow. Furthermore, PAB was more effective in the removal of protein from soluble extracellular polymeric substances (SEPSs). In summary, this study provides a novel solution to synthesize cationic microblock polyacrylamide for improving sludge dewatering.

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Functional styrenic copolymer based on 2-(dimethylamino)ethyl methacrylate: Reactivity ratios, biological activity thermal properties and semi-conducting properties

Cited by 17 publications

References 40 publications

Template Polymerization of a Novel Cationic Polyacrylamide: Sequence Distribution, Characterization, and Flocculation Performance

Template Polymerization of a Novel Cationic Polyacrylamide: Sequence Distribution, Characterization, and Flocculation Performance

Sulfonated RAFT Copolymers as Heparin Mimetics: Synthesis, Reactivity Ratios, and Anticoagulant Activity

Improvement of Sludge Dewaterability by Ultrasound-Initiated Cationic Polyacrylamide with Microblock Structure: The Role of Surface-Active Monomers

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