Micro-mechanism on Interfacial Functions in Polymer Matrix Composites

为了明确聚合物基复合材料的界面功能，主要采用硅烷处理玻璃纤维的微复合材料进行分子和力学评价。两种评价都给出了结构界面相与界面功能之间的关系。显微FTIR技术用于分子评价，微滴试验和拉拔试验用于微观力学评价。制备了直径为2mm ~ 8mm的单向棒状微复合材料，以了解其宏观力学性能。此外，还测量了裂纹扩展或白化长度，以了解界面增强与力学性能的关系。结合分子分析和力学试验，得出以下结论：首先，成膜剂的作用取决于硅烷分子与成膜剂的相互作用以及成膜剂与基体树脂的相互作用。其次，硅烷缩聚物的优化缩聚提高了界面增强。物理硅烷凝聚物提高了基体树脂的力学性能。最后，在单向复合材料中，硅烷凝聚物提高了材料的力学性能。这种分歧可以用弯曲试验中裂纹扩展时产生的白化长度来解释。

In order to clarify interfacial functions in polymer matrix composites, molecular and mechanical evaluation was employed mainly using micro-composite with silane-treated glass fiber. Both evaluations gave the relations between the structural interphase and the interfacial functions.Microscopic FTIR was used for the molecular evaluation while microdroplet and pull out tests was employed for the micro-mechanical evaluation. The unidirectional rod-like micro-composite with 2 mm - 8 mm in diameter was made up to know the macro-mechanical properties. In addition, crack propagation or whitening length was measured to see the relation between interfacial reinforcement and mechanical properties.Using the above evaluation with both molecular analysis and mechanical test, the following results was given : First, the role of film former was found to depend on the interaction between silane molecules and film former and on the interaction between film former and matrix resin. Second, an optimal condensation of silane polycondensates improved the interfacial reinforcement. Physical silane condensates enhanced the mechanical property of matrix resin. Last, such silane condensates, however, raise the mechanical property in the case of unidirectional composites. This disagreement was possible to be interpreted in terms of the length of whitening that occurred as crack propagation during bending test.