The effects of liquid-type additive, methoxynonafluorobutane, on the morphology, thermal conductivity, creep strain, and mechanical strength of polyurethane (PU) foams with an environment-friendly foaming agent, hyrdofluoroolefin, were investigated. The methoxynonafluorobutane under the trade name of NOVEC likely acted as a nucleating agent during the formation of PU foams. When NOVEC was added in the amount of 3 parts per hundred polyol by weight (php), the cell size of the foam was minimal, and the cell size distribution was relatively uniform. At the NOVEC content of 3.0 php, the thermal conductivity of the PU foams was also minimal. This decrease in thermal conductivity was due to the smaller cell size of the foams lowering their thermal conductivity. At 3.0 php NOVEC content, the creep strain of the PU foams was minimal being 0.29% at 1,000 h. At 3.0 php NOVEC, the estimated creep strain of the PU foam exhibited the lowest creep strain of 3.47% at 50 years. As a result, at 3.0 php NOVEC content, the cell wall was relatively less fractured, resulting in a small deformation of the PU foam. These results suggest that the main factors in improving the thermal insulation properties and stability of the PU foams are smaller cell size and narrow cell size distribution.

研究了液体型添加剂甲氧基九氟丁烷对使用环保型发泡剂氢氟烯烃的聚氨酯泡沫的形态，导热系数，蠕变应变和机械强度的影响。商标为NOVEC的甲氧基九氟丁烷可能在PU泡沫的形成过程中充当成核剂。当NOVEC以每100重量份多元醇3份（php）的量添加时，泡沫的孔尺寸最小，并且孔尺寸分布相对均匀。在NOVEC含量为3.0php时，PU泡沫的热导率也最小。导热率的下降是由于泡沫的较小泡孔尺寸降低了其导热率。在NOVEC含量为3.0 php时，PU泡沫的蠕变应变在1,000 h时最小，为0.29％。在NOVEC为3.0 php时，PU泡沫的估计蠕变应变在50年时表现出最低的蠕变应变，为3.47％。结果，在3.0php NOVEC含量下，孔壁的破裂相对较少，导致PU泡沫的变形很小。这些结果表明，改善PU泡沫的绝热性能和稳定性的主要因素是较小的泡孔尺寸和狭窄的泡孔尺寸分布。