Application of a Cyclic Butylene Terephthalate Oligomer Resin for Continuous Fiber Reinforced Composites

Application of a Cyclic Butylene Terephthalate Oligomer Resin for Continuous Fiber Reinforced Composites
Composite; Cyclic butylene terephthalate; Carbon fiber; Cabon nanotube; Fabric; Mat
Issue Date
Asian Textile Conference 12
Interests in polymerizable, low-viscosity oligomer resins are increasing in fibers and composites fields because high impregnation characteristics of polymer matrices are important for continuous fiber reinforced composites. In this presentation, applications of the polymerizable, low-viscosity cyclic butylene terephthalate (CBT) oligomer resin to continuous carbon fiber fabric and carbon nanotube mat composites, respectively, are introduced. High-speed mass production of the continuous carbon fiber fabric reinforced composites (CCFFRCs) is required to achieve weight savings of approximately 30 % of the total weight of an automobile when substituting metallic or ceramic automotive parts with CCFFRCs. The high-speed production of thermoplastic CCFFRCs with a processing time of only 2 min using the polymerizable, low-viscosity thermoplastic CBT resin is proposed. Despite a reduced processing time, excellent mechanical properties were obtained in the CCFRC specimen, such as a tensile strength of 440 MPa and an impact strength of 44 KJ/m2, because a high carbon fiber content of 70 vol % could be achieved without generation of pores and/or defects into the CCFFRCs due to the initial low molten viscosity and high impregnation characteristics of the CBT resin. The proposed high-speed production of the thermoplastic CCFFRC can compete with metal pressing because its processing time is less than a few minutes. In addition, a fabrication method was suggested to enhance the processability of a thermoplastic carbon nanotube (CNT) mat composite (CNTMC) using the polymerizable, low-viscosity CBT resin. The processing, and structure property relationship of the prepared CNTMC were studied. Superior electrical, thermal and mechanical properties were observed in the in-plane direction of the CNTMC because of the continuously and completely connected CNTs incorporated into the CNT mat filler. The thermal diffusivity in the in-plane di
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