Melt Polycondensation Bioplastik Poli Asam Laktat Dengan Katalis Timah (Ii) Kompleks Surfaktan

Saputra, Bayu Yusuf Eka (2025) Melt Polycondensation Bioplastik Poli Asam Laktat Dengan Katalis Timah (Ii) Kompleks Surfaktan. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Plastik konvensional berbasis minyak bumi terus meningkat pengguanaannya setiap hari. Tanpa disadari terdapat kandungan bahan kimia berbahaya (aditif) yang memiliki dampak berbahaya baik bagi manusia ataupun lingkungan. PLA sebagai bioplastik berperan dalam subtitusi plastic konvensional tersebut dimana PLA sudah mendapat label GRAS dan persetujuan dari FDA. Salah satu metode sintesis PLA ialah melt-polycondensation dengan kelebihan suhu operasi dan langkahnya yang sederhana, akan tetapi tantangan dalam metode tersebut ialah reaksi yang berkesetimbangan dengan air sehingga proses pembentukan rantai PLA terhambat. Pemilihan katalis Asam Lewis Sn (II) yang kompatibel dengan polikondensasi PLA akan dipadukan dengan surfaktan guna menanggulangi tantangan tersebut. Dalam penelitian ini langkah-langkah yang akan dilalui ialah sintesis Sn (II) surfactant complex dengan cara mencampurkan larutan Sn (II) dengan larutan surfaktan hingga diperoleh endapan. Setelah diperoleh Sn (II) surfactant complex digunakan dalam reaksi polikondensasi dengan variabl waktu dan konsentrasi katalis. Hasil sintesis Sn (II) surfactant complex menunjukkan keberhasilan yang didukung oleh karakterisasi FTIR, TGA, dan SEM-EDX. Hasil polikondensasi menunjukkan sinergisitas antara asam lewis Sn dengan surfaktan dimana hasil kondensat yang diperoleh jauh lebih banyak dibandingkan polikondensasi menggunakan pre-kursornya (SnCl2.2H2O). Kondisi polikondensasi yang optimal dengan katalis Sn (II) surfactant complex ialah pada konsentrasi katalis 5% w/w selama 23 jam dengan perolehan berat molekul berkisar di angka 60.000 g/mol. Proses polikondensasi yang di atas 23 jam tidak menunjukkan kenaikan berat molekul yang signifikan. Hasil karakterisasi FTIR dan H-NMR menunjukkan bahwa produk yang diperoleh adalah PLA.
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Conventional oil-based plastic usage continues to increase every day. Unbeknownst to many, these plastics contain hazardous chemical additives that pose risks to both human health and the environment. Polylactic acid (PLA), as a bioplastic, plays a role in substituting conventional plastics. PLA has received Generally Recognized as Safe (GRAS) status and approval from the FDA. One method of synthesizing PLA is through melt-polycondensation, which offers advantages in operating temperature and simplicity. However, a challenge in this method is the equilibrium reaction with water, hindering the formation of PLA chains.To address this challenge, the research explores the combination of Lewis Acid Sn (II) catalyst, compatible with PLA polycondensation, with a surfactant. The research involves the synthesis of Sn (II) surfactant complex by mixing Sn (II) solution with a surfactant solution to obtain a precipitate. After obtaining Sn(II) surfactant complex is used in polycondensation reactions with variable catalyst time and concentration. The results of the synthesis of the Sn(II) surfactant complex show success supported by the characterization of FTIR, TGA, and SEM-EDX. The results of polycondensation showed the synergy between Lewis Sn acid and surfactants where the condensate yield obtained was much more than polycondensation using the pre-cursor (SnCl2.2H2O). The optimal polycondensation condition with the Sn (II) surfactant complex catalyst is at a catalyst concentration of 5% w/w for 23 hours with a molecular weight gain of around 60,000 g/mol. The process of polycondensation over 23 hours did not show a significant increase in molecular weight. The results of FTIR and H-NMR characterization show that the product obtained is PLA.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Lewis Acid, Melt-Polycondensation, Polylactic Acid, Reverse-Micelle, Surfactant
Subjects:	T Technology > TP Chemical technology > TP1140 Polymers T Technology > TP Chemical technology > TP155.7 Chemical processes.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Chemical Engineering > 24101-(S2) Master Thesis
Depositing User:	Bayu Yusuf Eka Saputra
Date Deposited:	04 Feb 2025 02:41
Last Modified:	04 Feb 2025 02:41
URI:	http://repository.its.ac.id/id/eprint/118131

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