Redox initiator systems for emulsion polymerization of acrylates

Kohut‐Svelko, Nicolas; Pirri, Rosangela; Asúa, José M.; Leiza, José R.

doi:10.1002/pola.23362

Cited by 75 publications

(64 citation statements)

References 28 publications

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“…However, FS and FM were markedly increased mainly due to the higher DC. However, this is contrary to some investigations that reported an effect on the DC when high CQ levels were used, 20,21 likely due to the light-shielding effect of the photoinitiator. 22 The reduction in the speed of the reaction by BHT could result from the termination of the free radicals by the active phenol group in the BHT molecule.…”

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confidence: 91%

Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations

2016

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Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations abstract: The use of a free-radical polymerization inhibitor, butylhydroxytoluene (BHT), and a common photo-initiator, camphorquinone (CQ), to reduce polymerization stress in dental composite was investigated in this study. Samples were prepared by mixing Bis-GMA, UDMA, and TEGDMA at a 1:1:1 ratio (wt%), and silanized borosilicate glass fillers at 70 wt% were added to form the composite. Sixteen groups of resin composite were prepared using combinations of four CQ (0.1%, 0.5%, 1.0%, and 1.5%) and four BHT (0.0%, 0.5%, 1.0%, and 1.5%) concentrations. For each group, six properties were tested, including flexural strength (FS), flexural modulus (FM), degree of conversion (DC), contraction stress (CS), stress rate, and gel point (GP). The effects of CQ and BHT combinations on each of these properties were evaluated using two-way analysis of variance (ANOVA) and Fisher's Protected Least Significant Differences test at the 5% significance level. Groups with low CQ and BHT showed moderate values for FS, FM, and CS with a 70% DC. Increasing the BHT concentration caused a decrease in CS and DC with an increase in GP values. Increasing the CQ content led to a steady increase in values for FS and FM. High CQ and BHT combinations showed the most promising values for mechanical properties with low stress values.

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confidence: 91%

Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations

2016

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“…Even though 70 °C is a typical industrial reaction condition, others can be used. Thus, lower temperatures were employed for redox initiators, [28] and in postpolymerization higher temperatures were often required. [29] Therefore, it is important to study the effect of temperature on fouling.…”

Section: Comparison Of This Value Withmentioning

confidence: 99%

Reactor Fouling by Preformed Latexes

Urrutia

Bandrés

Asúa

2016

Macro Reaction Engineering

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Reactor fouling caused by preformed latexes is investigated using 50 wt% solids content latexes of different colloidal stability. In the absence of agitation, a rapid adsorption equilibrium is achieved for pH below the isoelectric point of the stainless steel (pH = 4.3). The equilibrium fouling decreases as solids content decreases and by increasing the pH above the isoelectric point of the stainless steel. The stability of the latex is a major factor determining fouling, which strongly decreases as latex stability increases. Under agitation, fouling increases with time, solids content, and temperature, and it decreases as the colloidal stability of the latex increases. The flow patterns in the reactor determine the distribution of fouling in the baffles. A mechanism for fouling formation is proposed by combining computational fluid dynamics and experimental results.

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“…[19,20] 2.3.4. Water absorption ratio Appropriate amount of the composite emulsions were coated on 5 cm × 5 cm PET films and dried to a constant weight at 70°C and then immersed into deionized water for 48 h at room temperature.…”

Section: Gel Fractionmentioning

confidence: 98%

Effect of hydrogenated acrylic rosin on structure and properties of polyacrylates emulsions by seeded semibatch emulsion polymerization method

Zhong

Lai

et al. 2015

Journal of Adhesion Science and Technology

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2015) Effect of hydrogenated acrylic rosin on structure and properties of polyacrylates emulsions by seeded semibatch emulsion polymerization method, Journal Hydrogenated acrylic rosin (HAR)/polyacrylate composite emulsions were prepared by seeded semibatch emulsion polymerization method. The effect of HAR amount on monomer conversion rate, coagulum rate, and gel fraction of the composite emulsions as well as the water absorption ratio, adhesion properties, and thermal durability of the HAR/polyacrylate composite latex films was studied; the composites were also characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatograph (GPC), differential scanning calorimetry, and thermogravimetry. The results showed that with the increase of HAR amount, the monomer conversion rate, gel fraction, molecular weight, and water absorption ratio were all decreased, and the coagulum rate and molecular weight distribution increased. HAR had good compatibility with polyacrylate, and when HAR amount was 4 wt%, the HAR/polyacrylate composite latex film had superior adhesion properties and thermal durability.

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Redox initiator systems for emulsion polymerization of acrylates

Cited by 75 publications

References 28 publications

Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations

Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations

Reactor Fouling by Preformed Latexes

Effect of hydrogenated acrylic rosin on structure and properties of polyacrylates emulsions by seeded semibatch emulsion polymerization method

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