超薄聚合物表面与滴状冷凝的研究

DROPWISE CONDENSATION ON SUPERTHIN POLYMER SURFACE

采用等离子体聚合技术在黄铜管外表面制备了六氟丙烯、六甲基二硅氧烷的超薄聚合物薄膜,实现了水蒸气的滴状冷凝.对不同冷凝表面的传热性能进行了实验测定,并对聚合膜的表面性能进行了测试和估算.分析讨论了聚合工艺条件对滴状冷凝传热及膜与基材粘着性能的影响.

Plasma polymerization (or glow discharge polymerization) was employed to prepare superthin polymer film coating on brass tubes from monomers, such as, hexafluoro-propene (HFP) and hexmethyldisiloxane (HMDSO). The experimental results indicated that dropwise condensation of steam could take place. The effects of the discharge power and polymerization time on dropwise condensation heat transfer were investigated. The surface energy of the polymer surfaces was evaluated by the measured contact angles of liquids on the surfaces at room temperature. The thickness of all of the polymer films was less than 0.1μm, so the thermal resistance of the polymer film could be neglected.