Synthesis and characterization of hydrophobically modified poly(vinyl alcohol) hydrogel membrane
Synthesis and characterization of hydrophobically modified poly(vinyl alcohol) hydrogel membrane
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DOI：
10.1016/j.polymer.2004.06.032
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发表时间：
2004-08-05
期刊：
影响因子：
4.6
通讯作者：
Badiger, MV
中科院分区：
文献类型：
--
作者：
Gholap, SG;Jog, JP;Badiger, MV
以n -叔丁基丙烯酰胺[NTBA]为接枝剂，通过自由基聚合法制备了疏水改性聚乙烯醇[PVA]。元素分析、红外光谱和核磁共振光谱证实了NTBA在PVA链上的掺入。制备了一系列不同NTBA含量的接枝共聚物，并用这些共聚物溶液在二甲亚砜中铸膜。通过接触角测量，考察了疏水性随NTBA含量的增加而增加。研究了膜的膨胀行为随温度、疏水含量、退火温度和时间的变化规律。研究了溶质通过这些膜的渗透性与溶质尺寸、膜疏水性和温度的关系。共聚物膜的溶胀行为表明，较低的NTBA含量使体积随温度的转变不连续，而较高的NTBA含量则使溶胀率降低，温度对溶胀的影响很小。溶质通过这些膜的渗透性与溶质的大小、溶液温度和膜的疏水性密切相关。采用DSC、DMA和XRD对共聚物膜进行了进一步表征。随着NTBA含量的增加，tan δ峰变宽。(C) 2004 Elsevier Ltd.版权所有。
Hydrophobically modified poly(vinyl alcohol), [PVA] was synthesized by graft copolymerization of N-tertiary butyl acrylamide [NTBA] onto PVA by free radical polymerization. The incorporation of NTBA onto PVA chains was confirmed by elemental analysis, FT-IR and NMR spectroscopy. A series of graft copolymers with different contents of NTBA were prepared and membranes were casted from these copolymer solutions in dimethyl sulfoxide. The increase in hydrophobicity with an increase in NTBA content was investigated by contact angle measurements. The swelling behaviour of membranes as a function of temperature, hydrophobic content, annealing temperature and period was studied. Permeability of solutes through these membranes was investigated as a function of solute size, membrane hydrophobicity and temperature. The swelling behaviour of the copolymer membranes showed that the lower content of NTBA gives discontinuous volume transition with respect to temperature whereas, the presence of higher amounts of NTBA showed decreased swelling ratios with very little influence of temperature on the swelling. The permeabilities of solutes through these membranes were strongly dependent on the size of the solute, solution temperature and hydrophobicity of the membrane. The copolymer membranes were further characterized using DSC, DMA and XRD. The tan delta peak becomes broader as the NTBA content increases. (C) 2004 Elsevier Ltd. All rights reserved.