Eliminating volatile-induced surface porosity during resin transfer molding of a benzoxazine/epoxy blend

被引：21

作者：

Anders, M. ^{[1
]}

Lo, J. ^{[1
]}

Centea, T. ^{[1
]}

Nutt, S. R. ^{[1
]}

机构：

[1] Univ So Calif, Viterbi Sch Engn, MC Gill Composites Ctr, 3651 Watt Way,VHE 708, Los Angeles, CA 90089 USA

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2016年 / 84卷

关键词：

Thermosetting resin; Cure behavior; Porosity; Resin transfer molding (RTM); SHRINKAGE CHARACTERIZATION; CHEMICAL SHRINKAGE; VOID FORMATION; EPOXY-RESIN; COMPOSITES; CURE; RTM; MECHANISMS; COLLAPSE; STRESSES;

D O I：

10.1016/j.compositesa.2016.02.024

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We studied the mechanism of volatile-induced surface porosity formation during the resin transfer molding (RTM) of aerospace composites using a blended benzoxazine/epoxy resin, and identified reduction strategies based on material and processing parameters. First, the influence of viscosity and pressure on resin volatilization were determined. Then, in situ data was collected during molding using a lab scale RTM system for different cure cycles and catalyst concentrations. Finally, the surface quality of molded samples was evaluated. The results show that surface porosity occurs when cure shrinkage causes a sufficient decrease in cavity pressure prior to resin vitrification. The combination of thermal gradients and rapid gelation can generate large spatial variations in viscosity, rendering the coldest regions of a mold susceptible to porosity formation. However, material and cure cycle modifications can alter the resin cure kinetics, making it possible to delay the pressure drop until higher viscosities are attained to minimize porosity formation. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：442 / 454

页数：13

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