Effects of polyethylene glycol on the flexibility of cold-setting melamine–urea–formaldehyde resin
2022
Zhang, Bengang | Wu, Zhigang | Liang, Jiankun | Yu, Liping | Xi, Xuedong | Lei, Hong | Du, Guanben
Polyethylene glycol (PEG) was used as the modifying agent of cold-setting melamine–urea–formaldehyde (MUF) resin adhesive in this work. Effects of the amount of PEG on the flexibility of MUF resin, and its bonding properties, as well as water resistance were studied. Then, the flexibility improvement mechanism was also discussed in this paper. Results showed that: (1) the strength and flexibility of MUF resin were greatly improved by PEG. With a PEG addition lower than 0.72% on the total amount of MUF resin, PEG exerted simultaneous reinforcing and flexibility improvement on MUF resin. (2) Both dry and wet shear strength of MUF resin increased with the addition of PEG, reaching the maximum values with 1.80% PEG on the total amount of MUF. (3) The DSC and TG results showed that thermal stability of MUF is degraded with the addition of PEG. (4) SEM results indicated that the addition of PEG was beneficial to the flexibility of MUF resin. The larger the addition amount of PEG, the better the flexibility improvement.
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