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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of Vinyl Amine-co-Vinyl Alcohol/Polysulfone Composite Membranes and Their Carbon Dioxide Facilitated Transport Properties
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Preparation of Vinyl Amine-co-Vinyl Alcohol/Polysulfone Composite Membranes and Their Carbon Dioxide Facilitated Transport Properties

机译：乙烯基胺-共乙烯基醇/聚砜复合膜的制备及其二氧化碳促进的传输性能

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摘要

A vinyl amine-vinyl alcohol copolymer (VAm-VOH) was synthesized through free-radical polymerization, basic hydrolysis in methanol, acidic hydrolysis in water, and an anion-exchange process. In the copolymer, the primary amino groups on the VAm segment acted as the carrier for CO_2-facilitated transport, and the vinyl alcohol segment was used to reduce the crystallinity and increase the gas permeance. VAm-VOH/polysulfone (PS) composite membranes for CO_2 separation were prepared with the VAm-VOH copolymer as a selective layer and PS ultrafiltration membrane as a support. The membrane gas permselectivity was investigated with CO_2, N_2, and CH_4 pure gases and their binary mixtures. The results show that the CO_2 transport obeyed the facilitated transport mechanism, whereas N_2 and CH_4 followed the solution-diffusion mechanism. The increase in the VAm fraction in the copolymer resulted in a carrier content increase, a crystallinity increase, and intermolecular hydrogen-bond formation. Because of these factors, the CO_2 permeance and CO_2/N_2 selectivity had maxima with the VAm fraction. At an optimum applied pressure of 0.14 MPa and at an optimum VAm fraction of 54.8%, the highest CO_2 permeance of 189.4 GPU [1 GPU51 × 10~(-6) cm~3(STP) cm~(-2) s~(-1) cmHg~(-1)] and a CO_2/N_2 selectivity of 58.9 were obtained for the CO_2/N_2 mixture. The heat treatment was used to improve the CO_2/N_2 selectivity. At an applied pressure of 0.8-0.92 MPa, the membrane heat-treated under 100℃ possessed a CO_2 permeance of 82 GPU and a CO_2/N_2 selectivity of 60.4, whereas the non-heat-treated membrane exhibited a CO_2 permeance of 111 GPU and a CO_2/N_2 selectivity of 45. After heat treatment, the CO_2/N_2 selectivity increased obviously, whereas the CO_2 permeance decreased.
机译：通过自由基聚合，甲醇中的碱性水解，水中的酸性水解和阴离子交换过程，合成了乙烯基胺-乙烯醇共聚物（VAm-VOH）。在该共聚物中，VAm链段上的伯氨基充当了CO_2促进运输的载体，而乙烯醇链段则被用于降低结晶度并提高气体渗透率。以VAm-VOH共聚物为选择层，以PS超滤膜为载体，制备了用于CO_2分离的VAm-VOH /聚砜（PS）复合膜。用CO_2，N_2和CH_4纯气体及其二元混合物研究了膜气体的选择性。结果表明，CO_2的迁移遵循便利的迁移机理，而N_2和CH_4遵循溶液扩散机理。共聚物中VAm分数的增加导致载体含量的增加，结晶度的增加以及分子​​间氢键的形成。由于这些因素，CO_2渗透率和CO_2 / N_2选择性随VAm分数的增加而达到最大值。在最佳施加压力0.14 MPa和最佳VAm分数为54.8％时，最高CO_2渗透率为189.4 GPU [1 GPU51×10〜（-6）cm〜3（STP）cm〜（-2）s〜（ -1）cmHg〜（-1）]，CO_2 / N_2混合物的CO_2 / N_2选择性为58.9。热处理用于提高CO_2 / N_2的选择性。在0.8-0.92 MPa的施加压力下，在100℃热处理的膜的CO_2渗透率为82 GPU，CO_2 / N_2选择性为60.4，而未热处理的膜的CO_2渗透率为111 GPU和CO_2 / N_2的选择性为45。热处理后，CO_2 / N_2的选择性明显增加，而CO_2的渗透性降低。

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