Photo-induced controlled/living copolymerization of styrene and acrylic acid and determination of reactivity ratios

Wang, Guoxiang; Lu, Mang; Yang, Chan-An; Hou, Zhaohui; Gao, Yong; Liu, Lichao; Zhong, Ming; H, Wu

doi:10.1007/s13726-014-0280-5

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…The molar ratios before and after copolymerization of EPEG and AA under different initiation conditions are shown in Tables S8–S10. The reactivity ratios calculated via the YBR method , are r EPEG = 0.0299 < 1, r AA = 2.6215 > 1 for photoinitiation, r EPEG ′ = 0.0126< 1, and r AA ′ = 5.0096 > 1 for redox initiation in Table S11. Under different initiations, r EPEG < r AA ( r EPEG ′ < r AA ′) indicates that the self-polymerization ability of EPEG is weaker than AA, and AA will self-polymerize into the main chain during the reaction, while EPEG inserts into the main chain in the form of segments to form a comb-like copolymer.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Zhou,

Li,

Duan

et al. 2024

ACS Appl. Polym. Mater.

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Polycarboxylate superplasticizers (PCEs) prepared by traditional free radical initiation methods need to use chemicals as initiators, which are environmentally unfriendly. In contrast, photoinitiation offers an ecofriendly and sustainable alternative. In our work, PCEs are successfully synthesized by photoinitiated radical polymerization without photoinitiators using ethylene glycol monovinyl polyethylene glycol (EPEG) and acrylic acid (AA) as monomers. The structure and properties of PCEs synthesized by photoinitiation and conventional redox initiation are studied, and the influence mechanism is discussed. The molecular weight distribution of photopolymerized PCE (LPCE) is narrower, and the constructed molecular structure is closer to the theoretical design. Therefore, the adsorption capacity and adsorption layer thickness of LPCE are increased on cement, which significantly improves the dispersion performance of cement paste, reduces the viscosity of paste, and enhances the compressive strength of concrete. Moreover, the reactivity ratios of EPEG and acrylic acid (AA) under photoinitiation are r EPEG = 0.0299 and r AA = 2.6215, and those of redox initiation are r EPEG ′ = 0.0126 and r AA ′ = 5.0096 via the Yezrielev−Brokhina−Roskin (YBR) method, proving that photoinitiation increases the reactivity ratio of EPEG and weakens the self-polymerization tendency of AA. This study provides a simple photoinitiated method for the synthesis of PCEs, which could potentially offer greater environmental friendliness.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Zhou,

Li,

Duan

et al. 2024

ACS Appl. Polym. Mater.

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“…The first source of hydroxyl radicals is produced by photogenerated holes reacting with water molecules around AgCl nanocubes. The photopolymerization process of NIPAm by using AgCl nanocubes as photoinitiators is illustrated in Scheme . Hydroxyl radicals act as living radicals and initiate the polymerization of monomers under UV irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…The PNIPAm solution was transparent with low absorbance at low temperature, and the solution became cloudy with much higher absorbance when the temperature was raised above 33 °C, as shown in Figure 4, which was conformed with the polymers' lower critical solution temperature (LCST), when PNIPAm underwent a reversible phase transition from a swollen hydrated state to a shrunken dehydrated state. 15,41 3. Kinetic Study of the Polymerization Process.…”

Section: Characterizations X-ray Diffraction (Xrd) Wasmentioning

confidence: 99%

Preparation of AgCl Nanocubes and Their Application as Efficient Photoinitiators in the Polymerization of N-Isopropylacrylamide

et al. 2015

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Uniform AgCl nanocubes with an average size of about 360 nm have been synthesized. Under UV illumination, a layer of silver nanoparticles with surface plasmon resonance was produced and covered the surface of AgCl particles in a short time, and the Ag/AgCl particles remained quite stable as shown in XRD patterns. The as-synthesized AgCl particles were tried for the first time as photoinitiator to polymerize N-isopropylacrylamide under UV-irradiation, and a high efficiency and conversion rate were realized. The structure of the polymers was studied by FTIR spectrophotometer. The results of turbidimetric method showed that the polymers were temperature sensitive and their lower critical solution temperature was about 33 °C. The effects of photoinitiators concentration, monomers concentration, and irradiation time on the polymer yield were investigated. The reaction mechanism was discussed by using salicylic acid as scavengers of hydroxyl radicals and conducting the reaction under oxygen atmosphere, respectively. The results proved that hydroxyl radicals were essential to chain initiation.

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Photo-induced single-electron transfer living radical polymerization (SET-LRP) of MMA in the presence of ZnO

Wang

Hou

et al. 2015

Iran Polym J

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Photo-induced controlled/living copolymerization of styrene and acrylic acid and determination of reactivity ratios

Cited by 5 publications

References 38 publications

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Preparation of AgCl Nanocubes and Their Application as Efficient Photoinitiators in the Polymerization of N-Isopropylacrylamide

Photo-induced single-electron transfer living radical polymerization (SET-LRP) of MMA in the presence of ZnO

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