Efeito das variáveis reacionais na síntese de um polímero biodegradável funcionalizado: PCL-g-MA

Siqueira, Danilo Diniz; Luna, Carlos Bruno Barreto; Morais, Dayanne Diniz de Sousa; Araújo, Edcleide Maria; França, Danyelle Campos; Wellen, Renate Maria Ramos

doi:10.1590/s1517-707620180004.0586

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The reagents maleic anhydride (MA), dicumyl peroxide (DCP), xylene, sodium hydroxide (NaOH), and acetic acid were used for superficial modification of macaíba shell. PCL‐g‐MA (C) was used as a compatibilizing agent 18 …”

Section: Methodsmentioning

confidence: 99%

Approaches on PCL/macaíba biocomposites ‐ mechanical, thermal, morphological properties and crystallization kinetics

Siqueira

Luna

Araújo

et al. 2021

Polymers for Advanced Techs

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Biocomposites based on macaíba shell (MS) and Polycaprolactone (PCL) were melting processed in this work; seeking better compatibility between PCL, MS was chemically treated with maleic anhydride (MA) and sodium hydroxide (NaOH), in addition, PCL‐g‐MA was used as compatibilizer. The biocomposites' performance was evaluated through Fourier transform infrared (FTIR), thermogravimetry (TG), contact angle, water absorption, scanning electron microscopy (SEM), the tensile experiments were executed according to ASTM D638 and the nonisothermal crystallization kinetics was performed from differential scanning calorimetry (DSC) scans using Pseudo‐Avrami, Ozawa, and Mo models. Chemical treated and compatibilized biocomposites presented better tensile behavior with no significant changes in the thermal stability. Higher HDT was verified on PCL/MS biocompounds due to the MS hardening effect, whereas higher contact angle and water absorption were computed for PCL/MS most due to new ways origin for the water get in as provided by MS. Related to crystallization kinetics Ozawa as displayed in the Appendix S1 failed to fit PCL/MS kinetics whereas Pseudo‐Avrami and Momay be safely used form processing purposes. Summing up, PCL/MS biocomposites were carefully investigated and gathered information may be promptly used in sundry applications as well as be added to the literature database.

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Section: Methodsmentioning

confidence: 99%

Approaches on PCL/macaíba biocomposites ‐ mechanical, thermal, morphological properties and crystallization kinetics

Siqueira

Luna

Araújo

et al. 2021

Polymers for Advanced Techs

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“…O PCL é um poliéster alifático sintético, biodegradável, biocompatível e bioabsorvível com subprodutos de decomposição de nenhuma toxicidade, o que justifica a grande utilização pela indústria farmacêutica em sistemas de liberação controlada. O PCL é um polímero semicristalino de degradação lenta sem provocar microambiente ácido, sendo considerado uma vantagem para o desenvolvimento de micropartículas (Rinaldi et al, 2009;Vogelsager Jr et al, 2004;Barboza, 2013;Mendes, 2011;Siqueira et al, 2018;Camargo et al, 2020).…”

Section: -Metoxipsoraleno 8-metoxipsoralenounclassified

Desenvolvimento e caracterização de micropartículas poliméricas contendo extrato de Ruta graveolens L. para veiculação em formulação de xampu infantil

Camargo

Carneiro²,

Monteiro³

et al. 2023

RSD

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O objetivo do presente estudo foi desenvolver, caracterizar e quantificar micropartículas de poli(ԑ-caprolactona) contendo extrato de Ruta graveolens L. para posterior veiculação em um xampu infantil para o combate seguro da pediculose. O extrato hidroalcóolico foi obtido da planta seca através do método de turbólise. As micropartículas foram obtidas pelo método da emulsão simples seguida da evaporação do solvente modificando a proporção de extrato e polímero. Os sistemas poliméricos foram caracterizados por meio de estudos morfológicos e espectroscópicos. A eficiência de encapsulação foi verificada pelo método indireto de quantificação. Uma formulação de xampu infantil foi desenvolvida, verificando as características organolépticas e físico-químicas. As micropartículas poliméricas foram obtidas com sucesso pelo método escolhido e apresentaram um rendimento médio de 49,7% e eficiência de encapsulação acima de 82,26%. Os sistemas apresentaram formato esférico e borda lisa, tamanho médio entre 686,9 e 2973,6 nm, baixo índice de polidispersão e potencial zeta negativo. Os espectros de infravermelho demonstraram bandas distintas para os materiais isolados em comparação com as formulações de micropartículas. A formulação de xampu infantil desenvolvida apresentou coloração branca, fragrância e textura condizentes à formulação de xampu. A densidade encontrada foi de 1,0025 g/mL e viscosidade de 47,78 cP, enquanto o pH da formulação foi próximo ao pH lacrimal. Com isso, o presente estudo obteve com sucesso as micropartículas de PCL contendo o extrato de R. graveolens L. e desenvolveu de maneira eficaz uma formulação de xampu infantil para veicular as micropartículas como alternativa segura ao tratamento da pediculose.

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“…Siqueira et al 31 investigated PCL functionalization with maleic anhydride (MA), using an experimental design. The factorial design methodology 2 3 was applied in order to evaluate the most efficient reaction condition for the MA grafting process.…”

Section: Introductionmentioning

confidence: 99%

Effect of injection parameters on the thermal, mechanical and thermomechanical properties of polycaprolactone (PCL)

Luna

Siqueira

Ferreira

et al. 2021

Journal of Elastomers & Plastics

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In this work, an experimental design was applied in the injection molding process of polycaprolactone (PCL), aiming to evaluate the mechanical properties (impact strength, tensile strength and Shore D Hardness), thermal (differential scanning calorimetry (DSC)) and thermomechanical (heat deflection temperature (HDT)), in PCL injected specimens. A type 2n planning was applied, with n = 3 and central point, having the input factors: processing temperature profile, mold temperature and injection flow. The results showed that the DSC curves presented a complex mechanism during crystallization, suggesting that depending on the processing conditions a high degree of crystallinity can be obtained. When using a higher processing temperature and a higher injection flow, there is an increase in the mass of the PCL parts. The impact strength is more expressive when a higher injection flow and a lower processing temperature are applied, reaching values around 260 J/m. The mold temperature impairs the elongation at the break of the PCL, while the elastic modulus was governed by the degree of crystallinity. A deleterious effect on HDT was observed with increased injection flow, suggesting that this parameter negatively affects thermomechanical resistance. The use of experimental design in the processing of PCL is important, since it is possible to optimize properties with the ideal conditions of injection molding.

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Efeito das variáveis reacionais na síntese de um polímero biodegradável funcionalizado: PCL-g-MA

Cited by 8 publications

References 21 publications

Approaches on PCL/macaíba biocomposites ‐ mechanical, thermal, morphological properties and crystallization kinetics

Approaches on PCL/macaíba biocomposites ‐ mechanical, thermal, morphological properties and crystallization kinetics

Desenvolvimento e caracterização de micropartículas poliméricas contendo extrato de Ruta graveolens L. para veiculação em formulação de xampu infantil

Effect of injection parameters on the thermal, mechanical and thermomechanical properties of polycaprolactone (PCL)

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