Polymer film dewetting for fabrication of out-of-autoclave prepreg with high through-thickness permeability
Polymer film dewetting for fabrication of out-of-autoclave prepreg with high through-thickness permeability
复制标题
用于制造具有高厚度渗透性的非热压罐预浸料的聚合物薄膜去湿
DOI：
10.1016/j.compositesa.2018.08.002
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Nutt
中科院分区：
文献类型：
--
作者：
S. Schechter;T. Centea;S. Nutt
聚合物薄膜在基材上的脱湿（与纤维床结构无关）被探索、开发并证明是一种生产非高压灭菌器、真空袋（OoA/VBO）预浸料的方法，这种预浸料具有高横向渗透率和工艺稳定性。测量了由除湿产生的表面开口的尺寸，并计算了暴露表面积的百分比。用连续膜和脱湿膜（不连续膜）制备预浸料以制备层压板。在标准和次优条件下进行了层合板的固化，并对固化前、固化中和固化后进行了表征。用脱湿树脂制造的层压板始终接近零孔隙率。相比之下，具有连续薄膜的层压板显示出高孔隙率，特别是在次优固化期间。研究结果表明，脱湿可以有效地用于生产具有高透厚渗透率的OoA预浸料，通过VBO加工可以获得无孔隙的层压板。此外，这些结果阐明了树脂脱湿的各个方面，这是创建坚固的OoA预浸料的关键。
Polymer film dewetting on a substrate (independent of fiber bed architecture) was explored, developed, and demonstrated as a method to produce out-of-autoclave, vacuum bag-only (OoA/VBO) prepregs with high transverse permeability and process robustness. The dimensions of the surface openings created by dewetting were measured, and the percent surface area exposed was calculated. Prepregs were fabricated with continuous and dewetted (discontinuous) films to produce trial laminates. The laminates were cured under both standard and sub-optimal conditions, and were characterized before, during, and after cure. Laminates fabricated with dewetted resin consistently achieved near-zero porosity. In contrast, laminates with continuous film displayed high levels of porosity, particularly during sub-optimal cure. The findings demonstrate that dewetting can be used effectively to produce OoA prepregs with high through-thickness permeability, which can yield porosity-free laminates via VBO processing. Furthermore, these results elucidate aspects of resin dewetting that are critical in the creation of robust OoA prepregs.