Molecular weight, casting conditions and the mechanical strength of acrylonitrile–maleic anhydride copolymer membrane

✍ Scribed by Yu-Xin Pei; Qing-Rui Wang

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 106 KB
• Volume: 10
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199907)10:7<434::aid-pat889>3.0.co;2-8

✦ Synopsis

The effects of molecular weight and casting conditions on the separation performance of acrylonitrile±maleic anhydride copolymer membrane have been discussed , and their effects on the mechanical property of the membrane investigated. The casting conditions included concentration of casting solution, pre-evaporation time, and temperatures of casting solution and coagulation bath. The breaking strength increased with an increase in molecular weight and concentration of casting solution. There was a minimum value of breaking strength when the pre-evaporation time was 40 sec and a maximum value when the temperature of casting solution was 40 °C or the temperature of the coagulation bath was 35 °C. Though the breaking strength of an acrylonitrile±maleic anhydride copolymer membrane can be improved by selecting casting conditions, it is more efficient to increase the molecular weight of the copolymer. The breaking strength of a copolymer membrane with an M w of 3.4 Â 10 5 was 309 N/cm 2 .