Studi Awal Sintesa Poly Lactic Acid Melalui Proses Ring Opening Polimerisasi (ROP) Dengan Irradiasi Gelombang Ultrasonik

Zahra, Nikmatuz (2023) Studi Awal Sintesa Poly Lactic Acid Melalui Proses Ring Opening Polimerisasi (ROP) Dengan Irradiasi Gelombang Ultrasonik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sintesa Poly Lactic Acid (PLA) dengan metode Ring Opening Polymerization (ROP) memiliki berberapa tahapan antara lain pretreatment proses atau dehidrasi, polikondensasi, depolimerisasi, dan polimerisasi (ROP). Tahap dehidrasi merupakan tahapan yang penting dalam sintesa PLA yang bertujuan untuk menghilangkan kandungan air dalam bahan baku asam laktat. Kandungan air dalam asam laktat dapat memberikan pengaruh terhadap polimerisasi PLA serta memberikan dampak pada property PLA yang dihasilkan. Untuk memaksimalkan dan mengefisiensi proses dehidrasi maka dalam penelitian ini digunakan teknologi ultrasonic pada tahap dehidrasi asam laktat. Penelitian ini bertujuan untuk mendapatkan kondisi optimum dehidrasi ultrasonic menggunakan analisa statistik Response Surface Methodology (RSM) dengan variable waktu (menit) dan power rate (%). Pada tahap polikondensasi, suhu juga divariasi guna mendapatkan yield oligomer tertinggi. Selain itu property fisik dan termal PLA dengan dehidrasi ultrasonic dan konvensional juga dibandingkan dalam penelitian ini. Variabel respon kadar air dianalisis dengan menggunakan Instrumen Karl Fisher. Asam laktat yang diperoleh dari proses dehidrasi pada kondisi optimum selanjutnya diproses pada tahap polikondensasi, depolimerisasi, dan ROP untuk menghasilkan PLA. Produk akhir PLA dianalisis dengan Gel Permeation Chromatography (GPC), Differential Scanning Calorimetry (DSC), Fourier Transform Infra-Red (FTIR), Proton Nuclear Magnetic Resonance (H-NMR), dan X-Ray Diffraction (XRD). Kondisi proses dehidrasi optimum diperoleh dengan waktu 110,2 menit dan power rate 34,94% berdasarkan persen kadar air minimum sebesar 1,4976% dengan produk akhir PLA yang memiliki berat molekul 40.567 g/mol, % kristalinitas 60,0142%, dan melting temperature (Tm) sebesar 145,32°C. Sedangkan suhu polikondensasi terbaik didapat pada suhu bertahap (150-180°C) dengan yield oligomer 69,7491%.
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The synthesis of polylactic acid (PLA) using the Ring Opening Polymerization (ROP) method has several stages such as dehydration, polycondensation, depolymerization, and polymerization (ROP). The dehydration stage is an important step in PLA synthesis with ROP, which aims to remove the water content in the lactic acid raw material. The water content in lactic acid can have an effect on the polymerization of PLA and have an impact on the properties of the resulting PLA. In order to maximize and make the dehydration process more efficient, ultrasonic technology is used in this study in the lactic acid dehydration stage. This study aims to obtain optimum conditions for ultrasonic dehydration using Response Surface Methodology (RSM) statistical analysis with time (minutes) and power rate (%) variables. In the polycondensation stage, the temperature is also varied to obtain the highest oligomer yield. In addition, the properties of PLA after ultrasonic and conventional dehydration were also compared in this study. Moisture content response variables were analyzed using the Karl Fisher instrument. Lactic acid obtained from the dehydration process at optimum conditions is then processed at the polycondensation, depolymerization, and ROP stages to produce PLA. The final PLA product was analyzed by Gel Permeation Chromatography (GPC), Differential Scanning Calorimetry (DSC), Fourier Transform Infra-Red (FTIR), Proton Nuclear Magnetic Resonance (H-NMR), and X-Ray Diffraction (XRD). The optimum dehydration process conditions were obtained with a time of 110.2 minutes and a power rate of 34.94% based on the minimum percent water content 1,4976%, with the final product PLA having a molecular weight of 40,567 g/mol, a percentage crystallinity of 60.0142%, and a melting temperature (Tm) of 145.32°C. Meanwhile, the best polycondensation temperature was obtained at a gradual temperature range of 150–180 °C with an oligomer yield of 69.7491%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Poly Lactic Acid, dehydration, polycondensation temperature, Ring Opening Polymerization, ultrasonic irradiation, Poly Lactic Acid, dehidrasi, suhu polikondensasi, Ring Opening Polimerisasi, irradiasi ultrasonik
Subjects:	T Technology > TP Chemical technology > TP1140 Polymers
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Chemical Engineering > 24101-(S2) Master Thesis
Depositing User:	NIKMATUZ ZAHRA
Date Deposited:	12 Feb 2023 01:34
Last Modified:	12 Feb 2023 01:34
URI:	http://repository.its.ac.id/id/eprint/96850

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