In order to study the thermal conductive properties of the aliphatic polyamide 6 (nylon 6, PA 6)/expanded graphite (EG) composite, the thermal conductivity was measured by varying the composite fabrication method and the specimen processing method. When the PA 6/EG composite was manufactured, the EG content of the main feeder and the side feeder was changed, and compression molding and injection molding were applied as specimen processing methods. Considering the mechanical properties, the optimal EG content was 40 wt%, and the higher the EG content in the side feeder, the higher the thermal conductive properties were. In addition, the thermal conductivity of the compression-molded specimen compared to the injection-molded specimen was excellent, which was measured to be related to the orientation of the EG. It was analyzed that the complex viscosity was partially increased by the addition of EG, but did not affect the processing characteristics of the composite.

지방족 폴리아미드 6(나일론 6, PA 6)/팽창 그라파이트(expanded graphite, EG) 복합체의 열전도 특성을 연구하기 위해 복합체 제조 방법 및 시험편 가공방법을 달리하여 열전도도를 측정하였다. PA 6/EG 복합체의 제조시 주투입구와 부투입구의 EG 함량을 변경하였으며, 시편 가공방법으로는 압축성형과 사출성형을 적용하였다. 기계적 특성을 고려할 때 EG 함량은 40 wt%가 최적이었으며, 부투입구의 EG 함량이 높을수록 열전도 특성은 증가하는 경향을 보여주었다. 또한 사출성형 시편 대비 압축성형 시편의 열전도도가 우수하게 나타났으며 이는 EG의 배향과 연관된 것으로 측정되었다. EG의 투입에 의해 복소점도가 일부 상승하는 결과를 보였지만, 복합체의 가공특성에 영향을 미치는 수준은 아닌 것으로 분석되었다.

Keywords: thermal conductivity, expanded graphite, Nylon 6, main and side feeder, orientation.