...致密层结构；空气间隙高度 [gap=10960]Key words：polyetherimide；gas separation；henis resistance model；dense skin layer；air-gap height ...
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dense skin layer
致密皮肤层
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The results showed that a dense skin layer, which is a kind of polyamide structure, had been combined with the modified PAN substrate surface due to the interfacial polymerization.
结果表明，采用界面聚合反应在PAN改性膜上已复合一层致密的表皮层，该致密表皮层是聚酰胺结构。
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