Emulsion polymerization of vinyl acetate initiated by potassium persulfate‐cyclohexanone sodium bisulfite redox pair system

Badran, A. S.; Moustafa, A. B.; Yehia, A. A.; Shendy, S. M. M.

doi:10.1002/pola.1990.080280215

Cited by 32 publications

(4 citation statements)

References 23 publications

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“…However, the Tg of polyvinyl acetate (PVA) is 29°C, therefore it is often copolymerized with EA to obtain a softer composition for use as emulsion ( 15 ). Since lower acrylate polymers like EA have Tg below room temperature, they are typically soft and rubbery, hence a small amount of MMA was added to impart strength and hardness to the polymer film ( 16 ). A small amount of acid monomer (AA and MAA) was also used to provide adhesion and thermosetting capability to the polymer film.…”

Section: Discussionmentioning

confidence: 99%

Deltamethrin Microencapsulation in Emulsion Paint Binder and Its Long-Term Efficacy Against Dengue Vector Aedes aegypti

Acharya

Ahirwar

Dhiman

et al. 2021

Front. Public Health

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Various control interventions have been effective in the control of arthropod vectors to a certain extent; still, sustained vector control is an existing problem globally. Insecticide-based formulations have been found to be useful, however the proper delivery of active molecules to target vectors is important. Currently, synthetic pyrethroid deltamethrin (DM) has been microencapsulated in the emulsion paint binder and evaluated for long-term effectiveness against dengue vector Aedes aegypti. Different compositions of emulsion binder were prepared by varying the content of monomer and DM. A selection was made for the composition yielding the best combination of properties like solid content, intrinsic viscosity, and DM content. Developed formulation was tested against laboratory-reared and pathogen-free Ae. aegypti mosquitoes. Encapsulation of DM in emulsion binder during polymerization showed a uniform distribution. The optimized formulation was stable and did not have a considerable plasticizing effect. Scanning electron microscopy revealed that grain-like micro crystals of DM and surfactant sodium lauryl sulfate (SDS) were uniformly distributed on the formulation surface. The best optimized formulation was highly effective against dengue vector Ae. aegypti and found to provide efficacy for up to 18 months of application. The knockdown time (KDT) values KDT10 and KDT50 were 7.4 min (95% CI: 5.6–9.1) and 22.1 min (95% CI: 19.7–24.3) respectively, whereas 24 h corrected mortality was 90% (95% CI: 82.5–97.5) after 18 months of application (T18). The probit model used to determine knockdown values did not deviate from the linearity and displayed normal distribution of knockdown % with time for different formulations (p ≥ 0.1). Presently developed DM microencapsulated emulsion binder was stable, smooth, and uniform. The binder displayed excellent anti-insect property and was capable of providing long-term effectiveness against dengue vectors Ae. aegypti. Such a formulation after field-scale evaluation could be very useful in attaining long-term protection from arthropod vectors.

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Section: Discussionmentioning

confidence: 99%

Deltamethrin Microencapsulation in Emulsion Paint Binder and Its Long-Term Efficacy Against Dengue Vector Aedes aegypti

Acharya

Ahirwar

Dhiman

et al. 2021

Front. Public Health

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“…where M 0 is the initial monomer concentration per mL, and ρ p is the density of the polymer (g/cm 3 ) [18][19][20]. The volume average diameter of the latexes was found to be 3.24 …”

Section: Synthesis Of Aqueous Hybrid Emulsion Of Si/pu/ommt Nanocompomentioning

confidence: 99%

Structural, thermal and morphological properties of aqueous hybrid emulsion of silylated poly (urethane)/organic modified montmorillonite nanocomposites based on a new silicone and imide ring containing vinylic macromonomer

Javaheriannaghash

Arianfar

2012

Polym. Sci. Ser. B

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A new silicone and imide ring containing vinylic macromonomer, N trimethylsiloxyethyltrimelli tilimidomethacrylate (TMSETMIM), has been synthesized for the formulation of waterborne polyurethane (PU). A vinyl group containing silicone, the (3 methacryloyloxypropyl) trimethoxysilane (MPTMS) was used for comparison of the effects of silicone type with TMSETMIM on the PU. Then, a series of new sili conized PU hybrid nanocomposites, were successfully synthesized by the emulsion polymerization in the presence of organic modified montmorillonite (OMMT) and an aqueous PU dispersion using ammonium peroxodisulfate (APS) as an initiator. The PU dispersion was synthesized by a polyaddition reaction of hex amethylene diisocyanate (HMDI), on polypropylene glycol (PPG 1000) and dimethylol propionic acid (DMPA) as a chain extender. The obtained NCO chain ends reacted with water (which acts as a further chain extender producing some urea bonds). The structural elucidation of monomer was carried out by FTIR, 1 H NMR, and 13 C NMR spectroscopic techniques. The copolymers were also characterized by using FTIR. Thermal properties of the copolymers were studied by using thermogravimetric analysis (TGA) and differen tial scanning calorimetry (DSC). The morphologies of the copolymers were characterized with scanning electron microscopy (SEM) and transition electron microscopy (TEM) and then the effects of silicone con centrations on the water absorption ratio was examined. The formed film from the hybrid emulsion contain ing TMSETMIM could provide obviously higher water resistance property in comparison with MPTMS. Also, the heat stability increases while the T g decreased.

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“…The following ingredients were mixed in a 250 mL three necked flask, the order of addition was as follows: water, emulsifier, initiator and either VAc or BuA monomer. The polymerization reactions were carried out at 70 • C (±1 • C) in an automatically controlled water bath (as mentioned previously [22][23][24]). All the experiments were run with mechanical stirring at 500 rpm.…”

Section: Homopolymerization Of Either Vinyl Acetate or Butylmentioning

confidence: 99%

The Emulsion Polymerization of Each of Vinyl Acetate and Butyl Acrylate Monomers Using bis (2-ethylhexyl) Maleate for Improving the Physicomechanical Properties of Paints and Adhesive Films

Shaffei¹,

Moustafa

Hamed³

2009

International Journal of Polymer Science

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Improving the water sensitivity of polyvinyl acetate PVAc films as well as pressure sensitivity, adhesion and washability of polybutyl acrylate were achieved by using bis (2-ethylhexyl) maleate (BEHM). The emulsion polymerization kinetics of vinyl acetate and butyl acrylate in presence of BEHM was studied. The order of the polymerization reaction with respect to the BEHM in presence of each of vinyl acetate and butyl acrylate was studied. The physicomechanical properties of the polyvinyl acetate films and vinyl acetate-butyl acrylate copolymer films were studied in presence of BEHM and the obtained results were matched with those prepared in the presence of pluronic F 108 and showed superior values. The obtained mean average molecular weights were found to be smaller in presence of BEHM assuring the presence of chain transfer reaction.

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Emulsion polymerization of vinyl acetate initiated by potassium persulfate‐cyclohexanone sodium bisulfite redox pair system

Cited by 32 publications

References 23 publications

Deltamethrin Microencapsulation in Emulsion Paint Binder and Its Long-Term Efficacy Against Dengue Vector Aedes aegypti

Deltamethrin Microencapsulation in Emulsion Paint Binder and Its Long-Term Efficacy Against Dengue Vector Aedes aegypti

Structural, thermal and morphological properties of aqueous hybrid emulsion of silylated poly (urethane)/organic modified montmorillonite nanocomposites based on a new silicone and imide ring containing vinylic macromonomer

The Emulsion Polymerization of Each of Vinyl Acetate and Butyl Acrylate Monomers Using bis (2-ethylhexyl) Maleate for Improving the Physicomechanical Properties of Paints and Adhesive Films

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