Reactive hot-melt resin can form joints with a certain flexibility, high processing speed, high initial rigidity, and high temperature. Such resins can be used to manufacture fiberglass composites because they support a high tensile stress, allow for large strains at low stresses, and have a low density and a working temperature range of −40–110°C. Furthermore, when the mechanical stress is removed, the material returns to its initial condition, as observed in the flexural tests. A polyurethane-based reactive hot-melt resin was characterized by tensile shear tests, Shore hardness tests, differential scanning calorimetry, and thermogravimetry. The contact angles at different temperatures were measured to evaluate the adhesive wettability and to select the best application temperature range of the adhesive, finding the best result at 140 °C. The matrix was characterized at different curing times, and matrix bonding with different adhesive materials was evaluated to provide a greater versatility of applications, to explore new fields of use of this resin as in the matrix of a composite with fiberglass.

中文翻译：

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具有聚氨酯基反应性热熔基体的复合材料

反应性热熔树脂可以形成具有一定柔韧性、加工速度快、初始刚度高、耐高温的接头。这种树脂可用于制造玻璃纤维复合材料，因为它们支持高拉伸应力，允许在低应力下产生大应变，并且具有低密度和 -40-110°C 的工作温度范围。此外，当去除机械应力时，材料会恢复到其初始状态，如弯曲测试中所观察到的那样。基于聚氨酯的反应性热熔树脂通过拉伸剪切试验、肖氏硬度试验、差示扫描量热法和热重法表征。测量不同温度下的接触角以评估粘合剂的润湿性并选择粘合剂的最佳应用温度范围，在140°C找到最佳结果。