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悬浮多功能纳米纤维素用作砂浆添加剂

Suspended Multifunctional Nanocellulose as Additive for Mortars.

作者信息

Diamanti Maria Vittoria, Tedeschi Cristina, Taccia Mariagiovanna, Torri Giangiacomo, Massironi Nicolò, Tognoli Chiara, Vismara Elena

机构信息

Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, 20131 Milan, Italy.

Department of Civil and Environmental Engineering, Politecnico di Milano, 20131 Milan, Italy.

出版信息

Nanomaterials (Basel). 2022 Mar 26;12(7):1093. doi: 10.3390/nano12071093.

DOI:10.3390/nano12071093
PMID:35407210
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9000320/
Abstract

Cellulose derivatives have found significant applications in composite materials, mainly because of the increased mechanical performance they ensure. When added to cement-based materials, either in the form of nanocrystals, nanofibrils or micro/nanofibers, cellulose acts on the mixture with fresh and hardened properties, affecting rheology, shrinkage, hydration, and the resulting mechanical properties, microstructure, and durability. Commercial cotton wool was selected as starting material to produce multifunctional nanocelluloses to test as additives for mortars. Cotton wool was oxidized to oxidized nanocellulose (ONC), a charged nanocellulose capable of electrostatic interaction, merging cellulose and nanoparticles properties. Oxidized nanocellulose (ONC) was further functionalized by a radical-based mechanism with glycidyl methacrylate (GMA) and with a mixture of GMA and the crosslinking agent ethylene glycol dimethacrylate (EGDMA) affording ONC-GMA and ONC-GMA-EGDMA, both multifunctional-charged nanocellulose merging cellulose and bound acrylates properties. In this work, only ONC was found to be properly suitable for suspension and addition to a commercial mortar to assess the variation in mechanical properties and water-mortar interactions as a consequence of the modified microstructure obtained. The addition of oxidized nanocellulose caused an alteration of mortar porosity, with a decreased percentage of porosity and pore size distribution shifted towards smaller pores, with a consequent increase in compressive resistance, decrease in water absorption coefficient, and increased percentage of micropores present in the material, indicating a potential improvement in mortar durability.

摘要

纤维素衍生物在复合材料中有着重要应用，主要是因为它们能确保材料机械性能的提升。当以纳米晶体、纳米原纤维或微/纳米纤维的形式添加到水泥基材料中时，纤维素会对新拌材料和硬化材料的性能产生影响，包括流变学、收缩、水化以及由此产生的机械性能、微观结构和耐久性。选用商业用棉作为起始原料来制备多功能纳米纤维素，以测试其作为砂浆添加剂的性能。棉被氧化成氧化纳米纤维素（ONC），这是一种能够发生静电相互作用的带电纳米纤维素，兼具纤维素和纳米颗粒的特性。氧化纳米纤维素（ONC）通过自由基机制进一步用甲基丙烯酸缩水甘油酯（GMA）以及GMA与交联剂乙二醇二甲基丙烯酸酯（EGDMA）的混合物进行功能化处理，得到ONC-GMA和ONC-GMA-EGDMA，二者均为兼具纤维素和结合丙烯酸酯特性的多功能带电纳米纤维素。在这项工作中，仅发现ONC适用于悬浮并添加到商业砂浆中，以评估由于获得的微观结构改变而导致的机械性能变化和水-砂浆相互作用。氧化纳米纤维素的添加导致砂浆孔隙率发生改变

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