本研究以低密度聚乙烯發泡體作為微波吸收材之基材，藉著摻混不同比例之碳奈米管，找出最適合添加比例及加工條件。碳奈米管有高導電性，添加碳奈米管至材料中，材料不僅具有高強度、高韌性的特點，同時具有優良的導電性。本實驗結果指出添加碳奈米管具有明顯的導電效果且有良好的微波吸收，在碳奈米管15phr時就能達到不錯的效果，微波吸收值達到20dB以上，另外添加碳奈米管並不會影響基材結構且能大幅提升材料的耐熱性、材料機械性質等。 The aim of the present work was to prepare LDPE foam plastic capable of absorbing microwave by adding various amounts of carbon nanotube (CNT). It was found the chemical structure, melting point and crystallinity were not affected by the addition of CNT. All the blends had melting point at 107.degree.C and 37% crystallinity. However, the tensile strength and modulus increased with an increase in the addition of CNT. Furthermore, the surface conductivity and microwave absorption capability increased with the CNT. At the addition of 15phr, the absorption of microwave was already greater than 20 dB.