正庚烷为溶剂高温下制备聚二甲基硅氧烷渗透汽化膜的研究

发布时间：2018-07-13 18:13

【摘要】：为了缩短交联时间,本文以正庚烷作为溶剂,通过提高交联温度来制备聚二甲基硅氧烷(PDMS)渗透汽化膜.研究了交联温度和催化剂用量对交联膜的拉伸模量、水与乙醇的接触角以及膜在水和乙醇中溶胀度的影响.以质量分数10%的乙醇水溶液为料液,研究了分离温度对膜渗透汽化性能的影响.研究发现,在交联温度75℃下交联时间为0.63h,这仅是在20℃时交联时间(7.8h)的十分之一.交联温度为75℃时制备的膜的杨氏模量是90℃时制备膜的2倍.随着交联温度的升高,PDMS膜的杨氏模量逐渐变小;膜在水中的溶胀度较低,膜在乙醇中的溶胀度很高.催化剂的用量对膜的杨氏模量和溶胀度没有明显影响.此外,实验发现交联温度和催化剂用量对膜的疏水性没有明显影响.对于10%乙醇水溶液的渗透汽化分离实验表明,在交联温度为75℃条件下制备的膜的分离因子达到7.74.
[Abstract]:In order to shorten the crosslinking time, the polymethylsiloxane (PDMS) pervaporation membrane was prepared by increasing the crosslinking temperature by increasing the crosslinking temperature. The tensile modulus of the crosslinking film, the contact angle of water and ethanol and the swelling degree of the membrane in water and ethol were studied by increasing the crosslinking temperature. The ethanol water of 10% of the mass fraction of PDMS was studied. The effect of separation temperature on the pervaporation performance of membrane was studied. It was found that the crosslinking time was 0.63h at the crosslinking temperature of 75 C, which was only 1/10 of the crosslinking time (7.8h) at 20 C. The young's modulus of the film prepared by the crosslinking temperature was 2 times that of the preparation membrane at 90 C. As the crosslinking temperature increased, the PDMS film was increased. The modulus of Yang's modulus gradually becomes smaller, the swelling degree of the membrane in water is low, the swelling degree of the membrane in ethanol is very high. The amount of catalyst has no obvious influence on the young's modulus and swelling degree of the membrane. In addition, the experiment found that the crosslinking temperature and the amount of catalyst have no obvious influence on the hydrophobicity of the membrane. The pervaporation separation experiment on the 10% ethanol aqueous solution It is shown that the separation factor of the membrane prepared at the crosslinking temperature of 75 C is 7.74.
【作者单位】：东北林业大学理学院高分子膜实验室;
【基金】：国家自然科学基金资助项目(21376048)
【分类号】：TQ051.893

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