M. Zikrillah, Maktum Muharja, Rizki Fitria Darmayanti, M. Wildan Ibnu Batuthoh, Achri Isnan Khamil

Metode Baru Perhitungan Viskositas Intrinsik Dan Berat Molekul Polihidroksialkanoat Untuk Produksi Plastik Biodegradable

Introduction

Metode baru perhitungan viskositas intrinsik dan berat molekul polihidroksialkanoat untuk produksi plastik biodegradable. Metode baru hitung viskositas intrinsik & berat molekul Polihidroksialkanoat (PHA) untuk produksi plastik biodegradable. Studi ini gunakan Mark-Houwink, peroleh 621266.881 g/mol.

Abstract

Polyhydroxyalkanoates (PHA) merupakan jenis polimer yang termasuk dalam plastik biodegradable. Penelitian ini bertujuan untuk melakukan perhitungan viskositas intrinsik dan berat molekul dari Polihidroksialkanoat menggunakan metode Mark-Houwink. PHA dengan kosentrasi 0.1,0.2,0.3,0,4 gr/ml diumpankan ke dalam labu ukur yang berisi larutan kloroform (CHCl 3 ) dengan konsentrasi 50 ml lalu diaduk selama 4 jam, Setelah itu larutan dialirkan ke dalam kolom viskometer dengan kisaran waktu 1 menit. Berat molekul diukur dengan menggunakan metode Mark-Houwink. Hasil berat molekul yang diperoleh sebesar 621266.881 g/mol.  

Review

This paper addresses the important topic of Polyhydroxyalkanoates (PHA), a class of biodegradable plastics, and their characterization. The stated aim is to determine the intrinsic viscosity and molecular weight of PHA using the Mark-Houwink method, a standard technique for polymer characterization. The subject matter is highly relevant given the growing demand for sustainable materials, and a precise understanding of polymer properties like molecular weight is crucial for controlling their performance and processing into various applications. However, a significant discrepancy arises between the title, which claims a "New Method for Calculating Intrinsic Viscosity and Molecular Weight," and the abstract, which explicitly states the use of the established Mark-Houwink method. This contradiction needs to be addressed to accurately reflect the scope and novelty of the work. The abstract provides some clear details regarding the experimental setup, including the use of chloroform as a solvent and specific PHA concentrations (0.1, 0.2, 0.3, 0.4 gr/ml) for the measurements. The mention of a 4-hour stirring period and the final molecular weight result of 621266.881 g/mol offer tangible outcomes of the research. These elements suggest a methodical approach to data collection and calculation. The choice of chloroform is appropriate for many PHA types, and the Mark-Houwink method, while not "new," is a reliable and widely accepted approach for estimating molecular weight from intrinsic viscosity measurements. Despite these strengths, the abstract lacks critical details necessary for a comprehensive understanding and evaluation of the methodology. The description of the viscometry ("kolom viskometer dengan kisaran waktu 1 menit") is vague and does not specify the type of viscometer used (e.g., Ubbelohde, Ostwald) or how the intrinsic viscosity was derived from the raw efflux times (e.g., Huggins, Kraemer equations). Crucially, the Mark-Houwink constants (K and α) used for the molecular weight calculation are not provided, which are essential parameters for validating the reported molecular weight. Furthermore, while a final molecular weight is given, the abstract does not state the calculated intrinsic viscosity, which is a direct outcome of the experiment and necessary input for the Mark-Houwink equation. Future iterations should clarify the "new method" claim or adjust the title, provide detailed experimental procedures, and include all relevant constants and intermediate results to enhance transparency and reproducibility.

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