Preparation of chemical vapor sensing materials from composites of esterified poly(vinyl alcohol) and carbon black
Preparation of chemical vapor sensing materials from composites of esterified poly(vinyl alcohol) and carbon black
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DOI：
10.1016/j.snb.2011.03.014
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发表时间：
2011-08
影响因子：
8.4
通讯作者：
S. Sangngern;S. Sahasithiwat;A. Kaewvilai;Nattamon Koonsaeng;A. Laobuthee
中科院分区：
文献类型：
--
作者：
S. Sangngern;S. Sahasithiwat;A. Kaewvilai;Nattamon Koonsaeng;A. Laobuthee
通过酯化反应对聚乙烯醇进行改性，制备了聚乙烯醇共聚物。通过红外光谱、核磁共振氢谱和元素分析确定了聚乙烯醇的酯化程度。所得产物为聚(苯甲酸乙烯酯)-聚乙烯醇(B-PVA)和聚对甲苯酸乙烯酯-聚乙烯醇(P-PVA)。利用旋涂技术，将聚合物和炭黑在二甲基亚砜中混合，然后将其制成薄膜，在叉指电极上制备了化学气相传感器。以正己烷、甲苯、甲醇、乙醇、异丙醇、四氢呋喃、乙酸乙酯、乙腈、二甲基亚砜和水为溶剂，考察了传感器的化学气敏特性。实验结果表明，通过改变PVA的化学结构，可以降低产物的极性。因此，改性的PVA复合材料对低极性溶剂(如四氢呋喃或乙酸乙酯)有很好的响应。
Poly(vinyl alcohol) was modified by esterification to prepare poly(vinyl alcohol) copolymers. The degree of esterification on poly(vinyl alcohol) was elucidated by FTIR,1H NMR, and elemental analysis. The obtained products were poly(vinyl benzoate)-co-poly(vinyl alcohol) (B-PVA) and poly(vinylp-toluoate)-co-poly(vinyl alcohol) (P-PVA). The chemical vapor sensors were fabricated by the mixtures of polymer and carbon black in dimethyl sulfoxide and their subsequent preparation as thin films onto the interdigited electrodes by the application of the spin-coating technique. The chemical vapor sensing properties of the sensors were examined with various solvents, such as hexane, toluene, methanol, ethanol, isopropanol, tetrahydrofuran, ethyl acetate, acetonitrile, dimethyl sulfoxide, and water. The experimental results indicated that modifying the chemical structure of PVA results in the decreased polarity of the obtained products. The composites of modified PVA consequently responded well to low polarity solvents, such as THF or ethyl acetate.