การเตรียมและการทดสอบสมบัติของคอมโพสิตของพอลิ (เมทิล เมทาคริเลต-โค-บ ิวทิล เมทาคริเลต) แบบมีร่างแห และผงเปลือก ลำไยที่ถูกดัดแปร สำหรับใช้เป็นวัสดุดูดซับน้ำมันและตัวทำละลายอินทรีย์

Abstract

This study is focused on the preparation and property testing of composites of crosslinked poly(methyl methacrylate-co-butyl methacrylate) and modified longan shell powder (LSP) for use as oil and organic solvent absorbents which they contain amount of modified longan shell powder 2, 4, 6 and 8 percentage. The composites were synthesized by free radical polymerization from methyl methacrylate and butyl methacrylate using benzoyl peroxide as initiator and polyethylene glycol diacrylate as crosslinker. The success of modification of LSP and the synthesis was confirmed by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and scanning electron spectroscopy (SEM). The average percentages grafting determined by gravimetric method, TGA and FTIR were 30.08, 26.13 and 22.31 respectively. The prepared composites were brown and darker when increasing LSP content. The conversion percentage of composites is in the range of 95 to 98. The composites show higher thermal stability as increasing LSP content. After grafting, composites have more compatibility with LSP, observed by SEM. Water contact angle of composites is in the range of 55 to 75 degree. In this research, 4 organic solvents and 3 oils were used to study the absorption ability of the composites. It was found that the prepared composites show high absorption capacity in toluene in the range of 2.73 to 3.82 g/g and low absorption capacity in hexane water and oil (<0.5 g/g). The absorption kinetic model showed that absorption followed the pseudo-second order equation. It was found that chemisorption occurs. For the reusability of the composites, the results show that they can be used up to 10 times. Moreover, the absorption capacity of ethyl acetate that can be enhanced by adding the porogen, in this case deionized water. In conclusion, it can utilize LSP which is an agriculture waste for use as organic solvent absorbent. Moreover, modifications of LSP by grafting and alkalization can improve the adsorption rate of the composites.