Co-Condensation of Phloroglucinol-Nonylphenol-Urea-Formaldehyde Resin Enables High Toughness and Enhanced Warpage Resistance,Industrial & Engineering Chemistry Research

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Co-Condensation of Phloroglucinol-Nonylphenol-Urea-Formaldehyde Resin Enables High Toughness and Enhanced Warpage Resistance
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-02-09 , DOI: 10.1021/acs.iecr.3c04214
Xinyi Liu ₁ , Changfa Dai ₁ , Lin Ye ₁ , Yuanchun Zhang ₂ , Zhengjiang He ₂ , Xiaowen Zhao ₁

Affiliation

Urea-formaldehyde (UF) resin with excellent flame retardancy, high stiffness, and cost-effectiveness has been used widely, but it is still a challenge to prepare such resin with combined properties of high toughness and enhanced moisture-induced warpage resistance. In this study, 1,3,5-trihydroxybenzene and 2-nonylphenol were introduced into UF synthesis system to prepare phloroglucinol-nonylphenol-urea-formaldehyde (P-NP-UF) co-condensed resin. The results showed that the benzene ring and long-chain alkyl structure were successfully introduced into UF molecules. Compared with UF resin, the curing temperature and curing apparent activation energy of co-condensed resin decreased. P-NP-UF resin showed lower cross-linking density, higher crystallinity, and stronger molecular entanglement. Due to the restriction effect of rigid benzene ring structure, crystalline structure, and intermolecular entanglement on the chain movement, the moisture-induced warpage resistance of P-NP-UF was enhanced obviously. The tensile strength and impact strength of P-NP-UF increased by 54.81 and 36.42% compared to UF resin, respectively, and such a resin also exhibited improved thermal stability and excellent flame retardancy.

中文翻译：

间苯三酚-壬基酚-脲醛树脂的共缩合可实现高韧性和增强的抗翘曲性

脲醛（UF）树脂具有优异的阻燃性、高刚度和成本效益，已得到广泛应用，但制备这种兼具高韧性和增强耐湿翘曲性能的树脂仍然是一个挑战。本研究将1,3,5-三羟基苯和2-壬基苯酚引入UF合成体系中制备间苯三酚-壬基苯酚-脲-甲醛(P-NP-UF)共缩合树脂。结果表明，苯环和长链烷基结构成功引入UF分子中。与UF树脂相比，共缩合树脂的固化温度和固化表观活化能均降低。P-NP-UF树脂表现出较低的交联密度、较高的结晶度和较强的分子缠结。由于刚性苯环结构、晶体结构和分子间缠结对链运动的限制作用，P-NP-UF的耐湿翘曲性能明显增强。与UF树脂相比，P-NP-UF的拉伸强度和冲击强度分别提高了54.81%和36.42%，并且这种树脂还表现出改善的热稳定性和优异的阻燃性。

更新日期：2024-02-09

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