In recent years, geopolymers have shown potential to replace ordinary cement materials due to their simple preparation, low cost, and excellent performance. Adding organics to geopolymers can enhance toughness and broaden their application potential as building materials. However, the effect of common molding processes to enhance the toughness of organic polymers modified geopolymers remains very limited. In this study, high-toughness organic polymers modified geopolymers were prepared using vacuum-vibration-compaction (VVC) molding. The incorporation of 3-methacryloy loxypropyl trimethoxysilane (KH570) and sodium polyacrylate (PAAS), (KH-PAAS), was evaluated on the toughness system of the slag-based geopolymers. The micromechanical properties of the different hydrated phases were analyzed using a nano-scratch test (NST) and atomic force microscopy (AFM). The high fracture toughness (1.6–2.6 MPa*m) and low elastic modulus (20–30 GPa) of the hydrated new phase C-(A)-S-H/Polymer gels were proposed. KH-PAAS modified geopolymers produced 57–59 % C-(A)-S-H/Polymer gels in which C-(A)-S-H/Polymer gels, C-(A)-S-H gels, and KH-PAAS were planarly cross-distributed to form a 3D network structure. The toughness of KH-PAAS modified geopolymers is related to the amount of C-(A)-S-H/Polymer gels generation and distribution form. Finally, the formation mechanism of the C-(A)-S-H/Polymer gels was analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS) to quantify the ratio of different chemical reactions. The specific ratio was C-(A)-S-H-KH: C-(A)-S-H-PAAS: Ca-PAAS: KH–C-(A)-S-H-PAAS = 2.42 : 6.78: 47.58 : 1. This study provides ideas for subsequent investigation of the toughening mechanism of organic polymers modified geopolymers.

中文翻译：

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高韧性有机聚合物改性地质聚合物的制备及形成机理


近年来，地质聚合物因其制备简单、成本低廉、性能优异而显示出替代普通水泥材料的潜力。在地质聚合物中添加有机物可以增强韧性并拓宽其作为建筑材料的应用潜力。然而，普通成型工艺对提高有机聚合物改性地质聚合物韧性的效果仍然非常有限。在这项研究中，采用真空振动压实（VVC）成型法制备了高韧性有机聚合物改性地质聚合物。评估了 3-甲基丙烯酰氧基丙基三甲氧基硅烷 (KH570) 和聚丙烯酸钠 (PAAS) (KH-PAAS) 的掺入对矿渣基地质聚合物的韧性体系的影响。使用纳米划痕测试（NST）和原子力显微镜（AFM）分析不同水合相的微观机械性能。提出了水合新相 C-(A)-S-H/聚合物凝胶的高断裂韧性 (1.6–2.6 MPa*m) 和低弹性模量 (20–30 GPa)。 KH-PAAS 改性地质聚合物产生 57–59% C-(A)-S-H/聚合物凝胶，其中 C-(A)-S-H/聚合物凝胶、C-(A)-S-H 凝胶和 KH-PAAS 是平面交叉的分布形成3D网络结构。 KH-PAAS改性地质聚合物的韧性与C-(A)-S-H/聚合物凝胶的生成量和分布形式有关。最后，利用飞行时间二次离子质谱（ToF-SIMS）分析C-(A)-S-H/聚合物凝胶的形成机制，以量化不同化学反应的比率。具体比例为C-(A)-S-H-KH: C-(A)-S-H-PAAS: Ca-PAAS: KH–C-(A)-S-H-PAAS = 2.42 : 6.78: 47.58 : 1。本研究为后续有机聚合物改性地质聚合物增韧机理的研究提供思路。