[논문]Effects of Synthesis Method, Melamine Content and GPC Parameter on the Molecular Weight of Melamine-Urea-Formaldehyde Resins

KIM, Minjeong; PARK, Byung-Dae

doi:10.5658/wood.2021.49.1.1

Effects of Synthesis Method, Melamine Content and GPC Parameter on the Molecular Weight of Melamine-Urea-Formaldehyde Resins 원문보기

목재공학 = Journal of the Korean wood science and technology, v.49 no.1, 2021년, pp.1 - 13

KIM, Minjeong (Department of Wood Science and Technology, Kyungpook National University) , PARK, Byung-Dae (Department of Wood Science and Technology, Kyungpook National University)

Abstract ▼ AI-Helper

This study was conducted to investigate the effects of the synthesis method, melamine content, and GPC parameters (such as flow rate, column-detector temperature, and sample injection temperature) on the molecular weight of melamine-urea-formaldehyde (MUF) resins. Two different synthesis methods were employed. In the first method, MUF-A resins were synthesized by simultaneously reacting urea, formaldehyde, and melamine (5%, 10%, and 20%) using the reaction of alkaline-acid-alkaline steps under controlled temperature and viscosity. In the second method, MUF-B resins were synthesized by first reacting melamine at the same levels with formaldehyde and then by adding urea. The highest weight average molecular weight (Mw) of MUF-A resins was found at 10% melamine content when the flow rate was 0.3 and 0.8 ml/min; Mw decreased slightly at 20% melamine content. The results showed that Mw increased with an increase in the melamine content when the flow rate was 0.5 and 1.0 ml/min. In addition, Mw was the highest when the flow rate, column-detector temperature, and injection temperature were 0.3 ml/min, 50℃, and 25℃, respectively. On the contrary, MUF-B resins had greater Mw and number average molecular weight (Mn) than MUF-A resins. Overall, Mw and Mn increased as the melamine content increased. The optimal GPC parameter for MUF resins was determined as follows: a flow rate of 0.5 ml/min, a column-detector temperature of 50℃, and a sample injection temperature of 50℃.

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표/그림 (9)

표 Table 1. Properties of two types of MUF resins used in this study
표 Table 2. Experimental design for the MW measurements of MUF resins using the GPC
그림 Fig. 1. GPC chromatograms of two-types of MUF resins with different flow rates. (a) MUF-A resins, and (b) MUF-B resins with 10% melamine content.
그림 Fig. 2. M_n, M_w, and PDI of two types of MUF resins with three melamine contents and four flow rates. (a), (c), (e), and (g) are MUF-A resins, and (b), (d), (f), and (h) are MUF-B resins.
그림 Fig. 3. M_w of MUF-A resins with 10% melamine at different column-detector temperatures.
그림 Fig. 4. M_w of MUF-B resins with 10% melamine at different column-detector temperatures.
그림 Fig. 5. M_w of MUF-A resins with 10% melamine at different sample injection temperatures and flow rates.
그림 Fig. 6. M_w of MUF-B resins with 10% melamine at different sample injection temperatures and flow rates.
그림 Fig. 7. Schematic chemical structures of MUF-A and MUF-B resins.

참고문헌 (24)

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DOI : 10.5658/WOOD.2021.49.1.1
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