公开(公告)号：US5157960A

公开(公告)日：1992-10-27

申请号：US475659

申请日：1990-02-06

申请人： Timothy R. Brehm ,  Leon R. Glicksman

发明人： Timothy R. Brehm ,  Leon R. Glicksman

IPC分类号： G01N7/02 ,  G01N15/08

CPC分类号： G01N15/08 ,  G01N7/02

摘要： Method and apparatus are provided for accurately and more rapidly measuring the permeability of various test gases in cellular polymeric materials with very low permeation rates, comprising a constant volume test chamber sealed with indium gaskets, said chamber being connected to a gas inlet valve and test gas reservoir with pressure gauge, gas outlet valve and oil check valve, an absolute pressure transducer to track the change in pressure in the test chamber, and said chamber being submerged in a water bath for strict temperature control. A thinly cut foam sample is placed in the test chamber surrounded by the test gas, where the gas inside the sample is first allowed to reach equilibrium with the surrounding gas; the pressure of the surrounding gas is then raised or lowered, and the rate at which the sample takes up or gives off the test gas is recorded over time as a change in pressure of the test gas around the foam. From this pressure variation the desired permeability coefficient may be measured, and achieved more quickly due to the reduced thickness of the sample. Unlike standard prior art transmission-method devices, this new sorption method and apparatus also allows for separate determination of the diffusion and solubility coefficients; it further allows for the use of much thinner foam samples than can be reliably used in prior art methods, resulting in a substantial reduction in testing time. The effective diffusion coefficient is used as an input to a computational model which predicts the rate of aging in a foam insulation panel. The effective solubility coefficient is used primarily to understand the behavior of the blowing agent in the foam system.

摘要翻译： 提供了用于以非常低的渗透速率准确地并且更快速地测量多孔聚合材料中的各种测试气体的渗透性的方法和装置，其包括用铟垫片密封的恒定体积的测试室，所述室连接到气体入口阀和测试气体 具有压力表的储存器，气体出口阀和止油阀，用于跟踪测试室中的压力变化的绝对压力传感器，并且所述室被浸没在严格温度控制的水浴中。 将薄切的泡沫样品放置在由测试气体包围的测试室中，其中样品中的气体首先被允许与周围气体达到平衡; 然后周围气体的压力升高或降低，随着时间的推移，记录样品吸收或释放测试气体的速率随着泡沫周围的测试气体的压力变化而被记录。 从该压力变化可以测量期望的渗透系数，并且由于样品的厚度减小而更快地实现。 与标准现有技术的传输方法装置不同，这种新的吸附方法和装置还允许单独测定扩散和溶解度系数; 它进一步允许使用比现有技术方法中可靠地使用的更薄的泡沫样品，导致测试时间的显着降低。 有效扩散系数被用作预测泡沫隔热板中的老化速率的计算模型的输入。 有效的溶解度系数主要用于了解发泡剂在泡沫体系中的作用。