Subianto Surya, Choudhury Namita Roy, Dutta Naba
Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
Nanomaterials (Basel). 2013 Dec 23;4(1):1-18. doi: 10.3390/nano4010001.
Macromolecular modification of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF) was done with various proportions of sulfonic acid terminated, hyperbranched polysulfone (HPSU) with a view to prepare ion conducting membranes. The PVDF-co-HFP was first chemically modified by dehydrofluorination and chlorosulfonation in order to make the membrane more hydrophilic as well as to introduce unsaturation, which would allow crosslinking of the PVDF-co-HFP matrix to improve the stability of the membrane. The modified samples were characterized for ion exchange capacity, morphology, and performance. The HPSU modified S-PVDF membrane shows good stability and ionic conductivity of 5.1 mS cm¹ at 80 °C and 100% RH for blends containing 20% HPSU, which is higher than the literature values for equivalent blend membranes using Nafion. SEM analysis of the blend membranes containing 15% or more HPSU shows the presence of spherical domains with a size range of 300-800 nm within the membranes, which are believed to be the HPSU-rich area.
为了制备离子传导膜，采用不同比例的磺酸封端超支化聚砜（HPSU）对聚（偏二氟乙烯 - 共 - 六氟丙烯）（PVDF）进行了大分子改性。首先通过脱氟化氢和氯磺化对PVDF - co - HFP进行化学改性，以使膜更具亲水性并引入不饱和键，这将使PVDF - co - HFP基体发生交联，从而提高膜的稳定性。对改性后的样品进行了离子交换容量、形态和性能表征。对于含有20% HPSU的共混物，HPSU改性的S - PVDF膜在80°C和100%相对湿度下显示出良好的稳定性和5.1 mS cm⁻¹的离子电导率，这高于使用Nafion的等效共混膜的文献值。对含有15%或更多HPSU的共混膜的扫描电子显微镜分析表明，膜内存在尺寸范围为300 - 800 nm的球形区域，据信这是富含HPSU的区域。
