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首页> 美国卫生研究院文献>Polymers >Effect of Domain Structure of Segmented Poly(urethane-imide) Membranes with Polycaprolactone Soft Blocks on Dehydration of n-Propanol via Pervaporation
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Effect of Domain Structure of Segmented Poly(urethane-imide) Membranes with Polycaprolactone Soft Blocks on Dehydration of n-Propanol via Pervaporation

机译：聚己内酯软嵌段嵌段聚（氨基甲酸酯-酰亚胺）膜的域结构对正丙醇全蒸发脱水的影响

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Segmented poly(urethane-imide)s (PUIs) were synthesized by polyaddition reaction and applied for preparation of membranes. Tolylene-2,4-diisocyanate, pyromellitic dianhydride, and m-phenylenediamine for chain extension were used to form hard aromatic blocks. Polycaprolactone diols with molecular weights equal to 530 and 2000 g mol−1 were chosen as soft segments. The effect of the length of soft segments on the structure, morphology, and transport properties of segmented poly(urethane-imide) membranes were studied using atomic force microscopy, small-angle and wide-angle X-ray scattering, and pervaporation experiments. It was found that a copolymer with a shorter soft segment (530 g mol−1) consists of soft domains in a hard matrix, while the introduction of polycaprolactone blocks with higher molecular weight (2000 g mol−1) leads to the formation of hard domains in a soft matrix. Additionally, the introduction of hard segments prevents crystallization of polycaprolactone. Transport properties of membranes based on segmented PUIs containing soft segments of different length were tested for pervaporation of a model mixture of propanol/water with 20 wt % H2O content. It was found that a membrane based on segmented PUIs containing longer soft segments demonstrates higher flux (8.8 kg μm m−2 h−1) and selectivity (179) toward water in comparison with results for pure polycaprolactone reported in literature. The membrane based on segmented PUIs with 530 g mol−1 soft segment has a lower flux (5.1 kg μm m−2 h−1) and higher selectivity (437).
机译：通过加聚反应合成了分段的聚（氨基甲酸酯-酰亚胺）（PUI），并将其用于制备膜。甲苯2,4-二异氰酸酯，均苯四酸二酐和间苯二胺用于扩链，用于形成硬质芳族嵌段。选择分子量分别为530和2000 g mol -1 的聚己内酯二醇作为软链段。使用原子力显微镜，小角度和广角X射线散射以及渗透蒸发实验研究了软段长度对分段聚（氨酯-酰亚胺）膜的结构，形态和传输性能的影响。发现具有较短软链段（530 g mol -1 ）的共聚物由硬质基质中的软结构域组成，而引入具有较高分子量（2000 g mol -1 ）导致在软矩阵中形成硬域。另外，硬链段的引入防止了聚己内酯的结晶。测试了基于包含不同长度的软链段的分段PUI的膜的传输特性，以对具有20 wt％H2O含量的丙醇/水模型混合物进行全蒸发。结果发现，基于包含较长软链段的分段PUI的膜表现出较高的通量（8.8 kgμmm -2 h -1 ）和对水中的选择性（179）。与文献报道的纯聚己内酯结果进行比较。基于具有530 g mol -1 软段的分段PUI的膜通量较低（5.1 kgμmm -2 h -1 ）和更高的选择性（437）。

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