Abstract

Microfiltration membranes have been obtained from polymethylpentene by phase separation of its dioctyl sebacate solutions under cooling. The dissolution of the polymer was carried out at its melting point followed by formation of membrane precursors in the form of films from the resulting solution, which were then cooled and washed with acetone to remove the ester and pore formation. Using laser interferometry, it is shown that the phase diagram of the polymethylpentene–dioctyl sebacate system corresponds to amorphous separation with the UCST. The rheology of solutions is studied by rotational rheometry, and it found that the logarithm of viscosity decreases linearly with increasing concentration of dioctyl sebacate. According to calorimetry, dioctyl sebacate plasticizes polymethylpentene, reducing its crystallinity. Treatment of the resulting films with acetone leads to the complete extraction of dioctyl sebacate, and, at its concentration of 25–45 wt %, a through porous structure is formed. This procedure makes it possible to obtain fairly strong membranes with a water permeability of 16.4 kg/(m² h atm) and a retention coefficient of submicron particles with a diameter of 240 nm equal to 80%.

中文翻译：

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用于生产微滤膜的聚甲基戊烯溶液的相分离

摘要

通过在冷却下将其癸二酸二辛酯溶液进行相分离，从聚甲基戊烯获得了微滤膜。聚合物在其熔点下溶解，然后从所得溶液中形成薄膜形式的膜前体，然后将其冷却并用丙酮洗涤以除去酯并形成孔。使用激光干涉仪可以看出，聚甲基戊烯-癸二酸癸二酯体系的相图对应于UCST的无定形分离。通过旋转流变法研究了溶液的流变学，发现粘度的对数随癸二酸二辛酯浓度的增加而线性降低。根据量热法，癸二酸二辛酯增塑聚甲基戊烯，降低其结晶度。用丙酮处理所得薄膜可完全萃取癸二酸二辛酯，并在25-45 wt％的浓度下形成通孔结构。该程序可以得到渗透力为16.4 kg /（m² h atm），直径为240 nm的亚微米颗粒的保留系数等于80％。