Decrease of methyl methacrylate miniemulsion polymerization rate with incorporation of plant oils

Costa, Cristiane; Wagner, Manfred; Musyanovych, Anna; Landfester, Katharina; Sayer, Cláudia; Araújo, Pedro Henrique Hermes de

doi:10.1002/ejlt.201500192

Cited by 10 publications

(12 citation statements)

References 25 publications

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“…This noticeable decrease in the kinetics of the reaction using argan oil can be explained due to the large amount of unsaturated chains, especially oleic acid and linoleic acid, present in the chemical composition of the oil. This decrease in the reaction rate was also observed by Costa et al, who used andiroba oil and lindseed oil as costabilizers in miniemulsion polymerization reactions. According to Schork and Guo, the higher the concentration of double bonds in the costabilizer, the slower the reaction is, since it is higher the probability of the double bonds react with the free radicals presented in the polymerization, resulting in a decrease of the kinetic rate.…”

Section: Resultssupporting

confidence: 79%

“…Recently, some studies successfully used medium and long chain of fatty acids from vegetable oils acting as costabilizers in styrene, methyl methacrylate, and urethane miniemulsion polymerization reactions. However, most of the studied vegetable oils present, in its structure, unsaturated fatty acids, and hence, are less resistant to oxidation and degradation, or are in a less biocompatible polymeric matrix, resulting in a reduction of application.…”

Section: Introductionmentioning

confidence: 99%

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Vegetable Oils Acting as Encapsulated Bioactives and Costabilizers in Miniemulsion Polymerization Reactions

Bigon

Montoro²,

Lona

2017

Euro J Lipid Sci & Tech

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Vegetable oils with different chemical structures are successfully encapsulated and applied as costabilizers in miniemulsion polymerization reactions. The results are compared to hexadecane, a well-known costabilizer used for this type of polymerization. The great advantage of using vegetable oils is that besides acting as costabilizers, they are also encapsulated, increasing the application of the nanoparticles. Results show that kinetics tend to be slower with argan oil, due to the higher concentration of double bonds present in the oil. When coconut oil and jojoba oil are used, the kinetic rate kept nearly the same. The different types of costabilizers do not affect the average size of the particle, and are able to keep the miniemulsion stable throughout the reaction. DSC analysis shows a decrease in the glass transition temperature when the vegetable oils are used. However, after a long period of storage, the Tg of the polymers increases. STEM images show the formation of nanoparticles for hexadecane and the vegetable oils. However, the nanocapsule morphology appeares only when coconut oil, jojoba oil, and hexadecane are used, while for argan oil no phase separation can be detected in the polymer particle. Practical Applications: Miniemulsion polymerization reactions allow the production of polymeric nanoparticles in only one step with high encapsulation efficiency. To obtain a stable miniemulsion, it is necessary the addition of a costabilizer. The vegetable oils are chosen because besides acting as costabilizers the vegetable oils can increase the application of the nanoparticles since they have important characteristics and functionalities.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Vegetable Oils Acting as Encapsulated Bioactives and Costabilizers in Miniemulsion Polymerization Reactions

Bigon

Montoro²,

Lona

2017

Euro J Lipid Sci & Tech

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“…It is possible to observe the influence of the molar masses of the material by the concentration of fatty acid, and a decrease in the molar mass is observed as the concentration of fatty acid in the reaction medium increased from 5 wt% to 10 wt%. As discussed by Costa et al [28], when the free-radical polymerization was carried out in the presence of saturated fatty acids, an increase in the number of double bonds due to an increase in the fatty acid concentration led to a decrease in the reaction rate. As a consequence, the average molar masses of the polymers were reduced.…”

Section: Emulsion Polymerizationmentioning

confidence: 95%

“…In the study developed by Costa et al [28], polymeric materials were synthesized through a mini-emulsion polymerization reaction of methyl methacrylate in the presence of linseed oil and andiroba oil. A decrease in both the reaction rate and the average molar mass was observed to be proportional to the number of double bonds present in the oils.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Acrylated Soybean Oil-Containing Terpolymers through Emulsion Polymerization

Neves

Valadares

Machado

2018

Colloids and Interfaces

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This work focuses on the synthesis of terpolymers using methyl methacrylate (MMA) and vinyl pivalate (VPi), along with the incorporation of methacrylate acid (MA) and acrylated fatty acids (AFA) derived from commercial soybean oil. Emulsion polymerizations were carried out using different monomeric species, along with different initiator concentrations ranging from 0.5 g∙L−1 to 2.2 g∙L−1. The thermal properties of the terpolymers were improved when acrylated fatty acid was incorporated into the polymer chains, expressing glass transition temperatures (Tg) ranging from 70 °C to 90 °C and degradation temperatures in the interval between 350 °C and 450 °C for acrylated fatty acid concentrations ranging from 5 wt% to 10 wt%. Furthermore, a change was noted in the molar mass distributions as a result of acrylated fatty oil present in the polymers. The materials with 5 and 10 wt% of acrylated fatty oil presented mass-average molar masses of 225 kg∙mol−1 and 181 kg∙mol−1, respectively. As the results in this work suggest, the molar masses of the formed polymers are significantly altered by the presence of modified fatty acids.

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“…Miniemulsion polymerization is an in situ encapsulation technique, where polymer synthesis and encapsulation of the component of interest are performed in a single step [7]. Some authors have evaluated the use of alternative co-stabilizers, such as andiroba oil [8,9]; jojoba oil [8]; clove oil [10]; sunflower seed oil and linoleic acid [11]; linseed oil [9]; argan oil and coconut oil [12], being encapsulated as compounds of interest besides stabilizing the miniemulsion.…”

Section: Introductionmentioning

confidence: 99%

ZnO and quercetin encapsulated nanoparticles for sun protection obtained by miniemulsion polymerization using alternative co-stabilizers

Fogaça

Feuser

Ricci-Júnior

et al. 2020

Mater. Res. Express

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The present work evaluated the encapsulation of ZnO and quercetin in PBMA-PMMA-PS using the miniemulsion polymerization technique, aiming to develop nanoparticles with sun protection factor (SPF) and antioxidant activity (AA) for application in photoprotective lotions. In both formulations, octocrylene and green coffee oil were tested as co-stabilizing agents of the miniemulsion, being also encapsulated in the NPs, contributing to the SPF and AA of the obtained latexes. Spherical nanoparticles of homogeneous size, from 169 to 346 nm, and regular surfaces were obtained, remaining stable for at least 30 days. The encapsulation efficiency on the formulations tested was from 59 to 87% for ZnO, 47 to 51% for quercetin, 80 to 92% for octocrylene and 90 to 92% for green coffee oil. The quercetin and green coffee oil presented high antioxidant activity when encapsulated in polymeric NPs. The values of in vitro SPF was very good for formulations containing NPs-ZnO, with the best result for the simultaneous nanoencapsulation of ZnO and octocrylene (SPF 29±5). The application of the NPs of quercetin and green coffee oil may promote an increment on SPF in vivo, reducing the damage caused to the skin by UV radiation, beyond the ability to scavenge the free radicals generated by ZnO.

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Decrease of methyl methacrylate miniemulsion polymerization rate with incorporation of plant oils

Cited by 10 publications

References 25 publications

Vegetable Oils Acting as Encapsulated Bioactives and Costabilizers in Miniemulsion Polymerization Reactions

Vegetable Oils Acting as Encapsulated Bioactives and Costabilizers in Miniemulsion Polymerization Reactions

Tailoring Acrylated Soybean Oil-Containing Terpolymers through Emulsion Polymerization

ZnO and quercetin encapsulated nanoparticles for sun protection obtained by miniemulsion polymerization using alternative co-stabilizers

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