关于透气系数资料的收集虽已受到重视,但就气体及蒸汽对高分子膜的透过性来说,迄今存在着各种各样的定义。按照定义使用的单位也是五花八门的。最常见的单位是CGS单位制的cm~3·cm/(cm~2·s·cm Hg),或 cm~3·cm/(cm~2·s·atm)。巴(barrer)这个单位虽然也是常见的单位,它是10~(-10)cm~3·cm/(cm~2·S·cmHg),由于和最初的单位只是位数不同,故可看作是同一单位。这些单位的含义是:在给定单位厚度(cm)聚合物膜的厚 Although the collection of air permeability coefficient data has received much attention, various definitions have hitherto been made regarding the permeability of gas and vapor to polymer membranes. The units used by definition are also varied. The most common units are cm ~ 3 cm / (cm ~ 2 · s · cm Hg) or cm ~ 3 cm / (cm ~ 2 · s · atm) in CGS unit system. Although this unit of barrer is also a common unit, it is 10 ~ (-10) cm ~ 3 · cm / (cm ~ 2 · cmHg). Since the unit is only different from the original unit, it can be regarded as Is the same unit. The meaning of these units is: Thickness (cm) of the polymer film in a given unit