• Elastomers and Composites
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• 제43권2호
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• pp.113-123
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• 2008

에폭시 수지는 우수한 접착력, 높은 강도, 내크리프성, 내열성, 내화학성을 나타내는 열경화성 고분자이지만, 매우 깨지기 쉬우며 균열성장에 대한 낮은 저항성을 보여 낮은 충격강도를 보인다. 그러므로 본 연구에서는 에폭시 수지에 carboxyl-terminated butadiene acrylonitrile (CTBN) 및 amine-terminated butadiene acrylonitrile(ATBN)을 변량 첨가하여 에폭시 수지의 낮은 충격강도를 향상시키고자 한다. 에폭시/CTBN, 에폭시/ATBN복합체의 충격강도(impact strength)가 큰 값을 나타낼 때 표면자유에너지(surface free energy)의 비극성 값 또한 가장 큰 값을 보였으며, 반면에 인장강도와 유리전이온도는 감소함을 보였다. CTBN 및 ATBN을 각각 15 phr 첨가한 에폭시 복합체가 높은 표면자유에너지와 충격강도를 보였다. 결론적으로 액상고무의 첨가로 에폭시 수지의 취성을 향상시켰으며, 에폭시/CTBN보다는 에폭시/ATBN복합체의 물성이 더 우수하다고 사료된다.

• Carbon letters
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• 제19권
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• pp.1-11
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• 2016

In efforts to characterize and understand the properties and processing of phenylethynyl-terminated imide (LaRC PETI-5, simply referred to as PETI-5) oligomers and polymers as a high-temperature sizing material for carbon fiber-reinforced polymer matrix composites, PETI-5 imidization and thermal curing behaviors have been extensively investigated based on the phenylethynyl end-group reaction. These studies are reviewed here. In addition, the use of PETI-5 to enhance interfacial adhesion between carbon fibers and a bismaleimide (BMI) matrix, as well as the dynamic mechanical properties of carbon/BMI composites, are discussed. Reports on the thermal expansion behavior of intercalated graphite flake, and the effects of exfoliated graphite nanoplatelets (xGnP) on the properties of PETI-5 matrix composites are also reviewed. The dynamic mechanical and thermal properties and the electrical resistivity of xGnP/PETI-5 composites are characterized. The effect of liquid rubber amine-terminated poly(butadiene-co-acrylonitrile) (ATBN)-coated xGnP particles incorporated into epoxy resin on the toughness of xGnP/epoxy composites is examined in terms of its impact on Izod strength. This paper provides an extensive overview from fundamental studies on PETI-5 and xGnP, as well as applied studies on relevant composite materials.