Polyglycerol-based organic-inorganic hybrid adhesive with high early strength
Abstract The rapid achievement of high strength adhesive is of ever increasing importance for underground construction. Herein, a simple and effective strategy to make an adhesive in a “high early strength” way was based on excellent crosslinking and synergistic interactions among tripolyglycerol, waterglass and polyaryl polymethylene isocyanate (PAPI). The resultant organic-inorganic hybrid adhesive with three-dimensional interpenetrating network structure showed an excellent mechanical performance, the compressive strength could reach more than 50 and 60MPa after curing for 2 and 4h, respectively. The adhesive was mainly composed of amorphous polyurethane and crystalline polysilicic acid/NaHCO 3 composite, and its probable formation mechanism was proposed. Furthermore, the adhesive was thermally stable below 260°C and presented a favorable adhesion performance for dry/wet sands with various sizes. This work may open a simple and convenient avenue for the preparation of organic-inorganic hybrid adhesive with high early strength. Highlights Polyglycerol-based organic-inorganic hybrid adhesive was prepared via a simple and effective strategy. The adhesive showed a high early strength of 50MPa after curing for 2h. A probable formation mechanism of adhesive was proposed. The adhesive exhibited excellent thermostability and adhesion performance. Graphical abstract [DISPLAY OMISSION]
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