Kinetic parameters, thermal stability, biological activity, and dielectric properties of new methacrylate-based copolymers functionalized with methylparaben

Erol, İbrahi̇m; Akbıyık, Hatice

doi:10.1007/s10965-022-02950-6

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…This procedure was performed to gain parameters Kissinger's theory. According to this theory, the heating rate (β) and obtained temperatures of exothermal peaks (T p ) are accessible from the following equation [40]:…”

Section: Curability and Thermostability Of Synthesized Isosorbide Dim...mentioning

confidence: 99%

A Study of Isosorbide Synthesis from Sorbitol for Material Applications Using Isosorbide Dimethacrylate for Enhancement of Bio-Based Resins

Jašek,

Fučík,

Krhut

et al. 2023

Polymers

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Bio-based cross-linkers can fulfill the role of enhancing additives in bio-sourced curable materials that do not compare with artificial resin precursors. Isosorbide dimethacrylate (ISDMMA) synthesized from isosorbide (ISD) can serve as a cross-linker from renewable sources. Isosorbide is a bicyclic carbon molecule produced by the reaction modification of sorbitol and the optimal conditions of this reaction were studied in this work. The reaction temperature of 130 °C and 1% w/w amount of para-toluenesulfonic acid (p-TSA) were determined as optimal and resulted in a yield of 81.9%. Isosorbide dimethacrylate was synthesized via nucleophilic substitution with methacrylic anhydride (MAA) with the conversion of 94.1% of anhydride. Formed ISD and ISDMMA were characterized via multiple verification methods (FT-IR, MS, 1H NMR, and XRD). Differential scanning calorimetry (DSC) proved the curability of ISDMMA (activation energy Ea of 146.2 kJ/mol) and the heat-resistant index of ISDMMA (Ts reaching value of 168.9) was determined using thermogravimetric analysis (TGA). Characterized ISDMMA was added to the precursor mixture containing methacrylated alkyl 3-hydroxybutyrates (methyl ester M3HBMMA and ethyl ester E3HBMMA), and the mixtures were cured via photo-initiation. The amount of ISDMMA cross-linker increased all measured parameters obtained via dynamic mechanical analysis (DMA), such as storage modulus (E’) and glass transition temperature (Tg), and the calculated cross-linking densities (νe). Therefore, the enhancement influence of bio-based ISDMMA on resins from renewable sources was confirmed.

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Section: Curability and Thermostability Of Synthesized Isosorbide Dim...mentioning

confidence: 99%

A Study of Isosorbide Synthesis from Sorbitol for Material Applications Using Isosorbide Dimethacrylate for Enhancement of Bio-Based Resins

Jašek,

Fučík,

Krhut

et al. 2023

Polymers

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“…Metode Spektrofotometri UV-Vis memiliki kelebihan dibandingkan 2 metode lainnya, diantaranya yaitu biayanya yang lebih murah, waktu yang lebih singkat, dan prosedur kerja yang lebih sederhana (Suhartati 2017). Hal ini juga didukung oleh metilparaben dan propilparaben yang memiliki gugus kromofor, yaitu gugus tak jenuh kovalen yang dapat menyerap radiasi dalam daerah-daerah UV dan Vis, sehingga cocok untuk diukur menggunakan metode spektrofotometri UV-Vis (Erol & Akbıyık 2022). Berdasarkan uraian di atas, maka pada penelitian ini akan dilakukan analisis kadar paraben dalam toner yang beredar di toko online yang ada di Kota Bandung dan tidak memiliki nomor registrasi BPOM.…”

Section: Aunclassified

Analisis Pengawet Metilparaben dan Propilparaben pada Beberapa Sediaan Toner yang Beredar di Toko Online dengan Menggunakan Metode Spektrofotometri UV-Vis

Simorangkir,

Bertha Rusdi,

Farendina Suarantika

2023

BCSP

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Metil dan propil paraben merupakan pengawet yang banyak digunakan untuk sediaan kosmetik, diantaranya adalah toner. Peraturan BPOM Nomor 23 Tahun 2019 tentang Persyaratan Teknis Bahan Kosmetika, menjelaskan bahwa batas penggunaan metilparaben dan propilparaben sebagai pengawet dalam sediaan kosmetika adalah 0,4% untuk penggunaan tunggal dan 0,8% untuk penggunaan campuran. Maka, pada penelitian ini dilakukan pengukuran kadar metil dan propil paraben dalam toner yang beredar di toko online yang tidak memiliki nomor registrasi BPOM menggunakan metode spektrofotometri UV-Vis serta menyimpulkan apakah kadar yang didapat memenuhi persyaratan BPOM atau tidak. Penelitian ini menggunakan lima sampel diawali dengan optimasi fase gerak untuk KLT preparatif dilanjutkan dengan validasi metode analisis dan pengukuran kadar metil dan propil paraben dalam sampel toner. Hasil validasi metode analisis menunjukkan bahwa pengukuran dengan spektrofotometer UV-Vis baik untuk mengidentifikasi metilparaben karena dari hasil validasi metode menunjukkan nilai linieritas r= 0,9993; spesifisitas= spesifik karena pada spektrum uji tidak menunjukkan adanya puncak lain; LOD= 0,00017 ppm, LOQ= 0,00053 ppm; akurasi= 96,051%, dan presisi= 0,162%. Kadar yang didapat tidak memenuhi persyaratan BPOM yaitu 2,794 % b/v untuk sampel B dan 3,978 % b/v untuk sampel D. Pengawet propilparaben tidak terdeteksi pada semua sampel. Methyl and propyl parabens are preservatives that are widely used for cosmetic preparations, one of which is toner. BPOM Regulation Number 23 of 2019 concerning Technical Requirements for Cosmetic Ingredients, explains that the limit for the use of methylparaben and propylparaben as preservatives in cosmetic preparations is 0.4% for single use and 0.8% for mixed use. Therefore, in this study, measurements of methyl and propyl paraben levels in toner circulating in online stores that did not have BPOM registration numbers used the UV-Vis spectrophotometry method and concluded whether the levels obtained met BPOM requirements or not. This study used five samples, starting with optimizing the mobile phase for preparative TLC followed by validating the analytical method and measuring the levels of methyl and propyl paraben in the toner samples. The results of the validation of the analytical method showed that measurements with a UV- Vis spectrophotometer were good for identifying methylparaben because the results of the method validation showed a linearity value of r = 0.9993; specificity = specific because the test spectrum does not show any other peaks; LOD= 0.00017 ppm, LOQ= 0.00053 ppm; accuracy = 96.051%, and precision = 0.162%. The levels obtained did not meet BPOM requirements, namely 2.794% w/v for sample B and 3.978% w/v for sample D. The preservative propylparaben was not detected in all samples.

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Synthesis, structural characterization, therotical and electrical properties of novel sulpho-coumarin based methacrylate polymer

et al. 2022

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Kinetic parameters, thermal stability, biological activity, and dielectric properties of new methacrylate-based copolymers functionalized with methylparaben

Cited by 5 publications

References 32 publications

A Study of Isosorbide Synthesis from Sorbitol for Material Applications Using Isosorbide Dimethacrylate for Enhancement of Bio-Based Resins

A Study of Isosorbide Synthesis from Sorbitol for Material Applications Using Isosorbide Dimethacrylate for Enhancement of Bio-Based Resins

Analisis Pengawet Metilparaben dan Propilparaben pada Beberapa Sediaan Toner yang Beredar di Toko Online dengan Menggunakan Metode Spektrofotometri UV-Vis

Synthesis, structural characterization, therotical and electrical properties of novel sulpho-coumarin based methacrylate polymer

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