复合材料孔隙形成机理、影响机制及实验表征（英文）

Formation, Influence Mechanism and Experimental Characterization of Composite Porosity

针对常见的复合材料孔隙问题,从机械夹杂形核理论与经典形核理论分析了孔隙的形成与影响机制,并通过具体实验对孔隙形貌、分布、大小进行了表征。结果表明：纤维浸润性差、蒸气分子的滞留及交联反应时的分子挥发是孔隙形成的主要原因;较低固化压力条件（0.0～0.2 MPa）,对复合材料内部孔隙的消除作用不大,随固化压力提高,复合材料孔隙率及孔隙大小下降明显;孔隙率、孔隙大小与系统压力存在幂函数递减变化关系。

In view of the common issue of composite porosity, the formation and influence mechanism of composite porosity were elucidated from the aspects of mechanical mixed nucleation theory and classic nucleation theory, and the characterization of porosity morphology, distribution and size were conducted through specific experiments. Results show that poor wettability of fibers, retention of vapor molecules and molecular volatilization generated during crosslinking reaction are the main reasons of porosity formation. The lower cure pressures have little effect on eliminating the porosity. With the increase of cure pressure, the porosity factor and porosity size decrease significantly. There is a power function relation of three times among porosity factor, porosity diameter and cure pressure.