偏二氟乙烯与三氟乙烯的结晶共聚物对水的吸附及解吸

Water adsorption on and desorption from crystalline copolymers of vinylidene fluoride with trifluoroethylene.

作者信息

Rosa Luis G, Jacobson P A, Dowben P A

机构信息

Behlen Laboratory of Physics, Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111, USA.

出版信息

J Phys Chem B. 2005 Jan 13;109(1):532-5. doi: 10.1021/jp045896z.

DOI:10.1021/jp045896z

PMID:16851045

Abstract

Water adsorption and absorption on crystalline polyvinylidene fluoride with 30% trifluoroethylene, P(VDF-TrFE, 70:30), was examined by thermal desorption spectroscopy. Two distinctly different water adsorption sites are identified: one adsorbed species that resembles ice and another species that interacts more strongly with the polymer thin film. The existence of the latter species is consistent with X-ray diffraction studies of water absorbed into the bulk of copolymers of polyvinylidene fluoride with trifluoroethylene crystalline thin films. There are strong steric effects observed in the angle-resolved thermal desorption that may be a result of the large polymer thin film surface dipoles.

摘要

采用热脱附光谱法研究了含30%三氟乙烯的结晶聚偏二氟乙烯P(VDF-TrFE, 70:30)对水的吸附和吸收情况。确定了两个明显不同的水吸附位点：一种吸附物种类似于冰，另一种物种与聚合物薄膜的相互作用更强。后一种物种的存在与聚偏二氟乙烯与三氟乙烯结晶薄膜共聚物本体中吸收的水的X射线衍射研究结果一致。在角分辨热脱附中观察到强烈的空间效应，这可能是大聚合物薄膜表面偶极子的结果。