https://ph02.tci-thaijo.org/index.php/SIAM/issue/feed SIAM: Science and Innovation of Advanced Materials 2025-02-25T12:41:17+07:00 Dr. Chitnarong Sirisathitkul chitnarong.siri@gmail.com Open Journal Systems <p>Science and Innovation of Advanced Materials <span style="display: inline !important; float: none; background-color: #ffffff; color: #000000; cursor: text; font-family: 'Noto Sans',Arial,Helvetica,sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;">(SIAM)</span> is an official journal of Materials Research Society-Thailand.</p> <p>&nbsp;</p> https://ph02.tci-thaijo.org/index.php/SIAM/article/view/255213 Porous Poly(methyl methacrylate) Microsphere via Suspension Polymerization: Synthesis, Characterizations, and the Effect of Triglycerides as Porogen 2024-09-21T13:59:41+07:00 Nutchanon Putthabucha nutchanonfncn@gmail.com Saran Salakij Piyachai.Kh@chula.ac.th Piyachai Khomein Piyachai.Kh@chula.ac.th <p>Porous microspheres with interconnected internal and external pores can provide a large specific surface area, making them excellent adsorbents for various applications such as controlled drug release, chromatography, tissue engineering scaffolds, and blood purification. Poly(methyl methacrylate) (PMMA) has been globally utilized in many medical applications (e.g., adsorbents, drug delivery, dental implants, etc.) due to its unique properties including good thermal and chemical stability, biocompatibility, and hemocompatibility. In this work, we developed a method to prepare PMMA porous microspheres using triglycerides as porogen via suspension polymerization yielding particle size of 300-500 µm with a specific surface area as high as 281 m<sup>2</sup>×g<sup>-1</sup>. In addition, we also investigated the effect of triglycerides ranging from short-, medium-, and long-chain triglycerides as a porogen, which can influence the morphology and mechanical stability of the microspheres. The microspheres were characterized through an optical microscope and scanning electron microscope on morphology. In addition, pore size, pore volume, and specific surface area were calculated by BET method. The porosity of the microspheres was observed to be dependent on the type of triglycerides, where the short chain provided the highest porosity and the long chain provided the lowest porosity.</p> <p> </p> <p><strong>Keywords: </strong>Porous microspheres, Poly(methyl methacrylate) (PMMA), Triglycerides porogen, Suspension polymerization</p> 2025-02-20T00:00:00+07:00 Copyright (c) 2025 SIAM: Science and Innovation of Advanced Materials https://ph02.tci-thaijo.org/index.php/SIAM/article/view/256866 Chemical Recycling of Post-consumer Polylactide Products by Microwave-Assisted Aminolysis with Ethylenediamine 2025-02-25T12:41:17+07:00 Jetawat Wadputi pakorn@siit.tu.ac.th Atitsa Petchsuk pakorn@siit.tu.ac.th Mantana Opaprakasit pakorn@siit.tu.ac.th Pakorn Opaprakasit pakorn@siit.tu.ac.th <p>The demand for bioplastics has recently increased as a promising alternative to conventional plastics due to their degradability, renewability, and excellent properties compared to their fossil-based counterparts. Although these materials are degradable, recycling their post-consumer products is considered effective and sustainable, especially by converting them into value-added feedstocks or starting materials for other processes. In this work, a chemical recycling process for polylactide (PLA) by aminolysis depolymerization is developed, employing a diamine as a nucleophile to cleave the ester bonds of PLA. The process utilizes microwave irradiation and ethylenediamine (EDA) as a reactant. The effects of the PLA/EDA feed ratio on the chemical structures and compositions of the aminolyzed PLA oligomers are investigated by ATR-FTIR and <sup>1</sup>H-NMR spectroscopy. The chemical structures and average length of the lactate sequences are determined. The product mixture consists of amino-capped lactate sequences of different lengths, <em>i.e.</em>, mono-lactate, di-lactate, and poly-lactate. These are classified into two structures: <em>Structure A</em> is generated when a single -NH<sub>2</sub> of EDA reacts and attaches to lactate sequences, while <em>Structure B</em> is formed when both amine groups react. At a low PLA/EDA feed content of 5:1, the aminolyzed products consist of 91% <em>Structure A</em> content with the shortest average lactate length of 0.9 units, as the high EDA feed content effectively enables its -NH<sub>2</sub> groups to compete with each other to convert the ester bonds of PLA. When the feed ratio was increased to 30:1, <em>Structure B</em> became a major product at 85%, with an average lactate length of 11.1, due to the deficit of -NH<sub>2</sub> groups in the system. The variation in these reaction parameters enables the synthesis of products with tunable structures for use in specific applications. The developed process is promising for converting PLA waste, with a short reaction time, into starting materials for other value-added products, especially lactide-based polyurethanes.</p> 2025-04-08T00:00:00+07:00 Copyright (c) 2025 SIAM: Science and Innovation of Advanced Materials