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首页> 外文期刊>Cellulose >A novel design for nanocellulose reinforced urea-formaldehyde resin: a breakthrough in amino resin synthesis and biocomposite manufacturing
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A novel design for nanocellulose reinforced urea-formaldehyde resin: a breakthrough in amino resin synthesis and biocomposite manufacturing

机译：纳米纤维素增强尿素 - 甲醛树脂的一种新型设计：氨基树脂合成和生物复合制造中的突破

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Urea-formaldehyde (UF) resins are often reinforced with natural fibers or nanostructures such as cellulose microfibrils (CMFs) to improve their mechanical and physical properties in wood panels. However, the high-water content in these suspensions is a limitation on applications in thermosetting resins. The innovative technology investigated here consists of the in-situ production of a methanediol-based suspension of CMFs through a mechanical process and its incorporation during resin synthesis. We sought to maintain the physicochemical properties and the basic chemical composition of the resin. The synergy between the resin and CMFs provided a shielding effect and a greater storage modulus (E'). We demonstrate that this approach is robust through standard viscoelastic, physical, and mechanical tests. Likewise, a methanediol-based CMF suspension used to synthesize UF resin was effective to reduce formaldehyde emission during the resin cure reactions. Finally, the bio-based composites manufactured with this UF resin containing CMF had better performance due to increased internal bond strength by up to 15%, reduced water absorption by up to 8%, and reduced formaldehyde emission by 30% at environmental temperature.
机译：脲醛树脂（UF）通常用天然纤维或纤维素微纤维（CMF）等纳米结构增强，以改善其在人造板中的机械和物理性能。然而，这些悬浮液中的高含水量限制了其在热固性树脂中的应用。本文所研究的创新技术包括通过机械过程原位生产基于甲二醇的CMF悬浮液，并在树脂合成过程中将其纳入。我们试图保持树脂的物理化学性质和基本化学成分。树脂和CMF之间的协同作用提供了屏蔽效应和更大的储能模量（E'）。我们通过标准的粘弹性、物理和机械测试证明了这种方法的鲁棒性。同样，用于合成UF树脂的基于甲二醇的CMF悬浮液有效地减少了树脂固化反应期间的甲醛释放。最后，使用这种含有CMF的UF树脂制造的生物基复合材料具有更好的性能，因为在环境温度下，内部粘结强度提高了15%，吸水率降低了8%，甲醛释放量降低了30%。

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