Sorption of long aliphatic carboxylic acids (lauric with 12 C atoms and stearic with 18 C atoms) and of an aliphatic dicarboxylic acid (adipic), by amorphous and nanoporous-crystalline δ-form and ε-form films of syndiotactic polystyrene (sPS), is reported. Fourier Transform Infrared (FTIR), Polarized FTIR and Wide Angle X-ray diffraction (WAXD) patterns show that the empty crystalline channels of the ε form are able to host long carboxylic acids as well as dicarboxylic acids. These acids are instead absorbed much more slowly and only from the amorphous phase for δ form sPS films, which exhibit crystalline cavities rather than crystalline channels. This selective and fast uptake of carboxylic acids in the crystalline channels of the sPS ε form is due the formation of hydrogen bonded linear dimers and linear polymers, for monocarboxylic and dicarboxylic acid guests, respectively.

通过间规聚苯乙烯 (sPS) 的无定形和纳米多孔结晶 δ 型和 ε 型薄膜吸附长脂肪族羧酸（具有 12 个 C 原子的月桂酸和具有 18 个 C 原子的硬脂酸）和脂肪族二羧酸（己二酸），被报道。傅里叶变换红外 (FTIR)、偏振 FTIR 和广角 X 射线衍射 (WAXD) 图显示 ε 形式的空结晶通道能够承载长羧酸和二羧酸。相反，这些酸的吸收速度要慢得多，并且仅从 δ 形成 sPS 薄膜的无定形相中吸收，其表现出结晶空腔而不是结晶通道。在 sPS ε 形式的结晶通道中，羧酸的这种选择性和快速吸收是由于形成了氢键连接的线性二聚体和线性聚合物，