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首页> 外文期刊>Journal of Applied Polymer Science >Surface energy mapping of Kevlar (R) fibers by inverse gas chromatography
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Surface energy mapping of Kevlar (R) fibers by inverse gas chromatography

机译：反相气相色谱法分析芳纶纤维的表面能

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The surface energy characteristics of three Kevlar(R) fibers have been systematically studied using two inverse gas chromatography (IGC) techniques, i.e., at an infinite probe dilution and at a finite probe concentration, with the latter allowing a unique mapping of the surface energy levels, which complements greatly the more traditional characterization of the highest energy sites. The standard thermodynamic parameters, such as the free energy -Delta G(A) degrees, and the adsorption enthalpy and entropy (Delta H-A degrees and -Delta S-A degrees), as well as the dispersive and the specific component (beta(s)(d) and Delta G(sp)/I-sp) of the fiber surface energy, were determined from the retention behavior at zero coverage of selected molecules of various polarity. The gamma(s)(d) values are between 49-58 mJ m(-2) for the three fibers at 50 degrees C. The polar components, Delta G(sp) Or I-sp, calculated by three different methods, reveal the polar feature of the fiber surface. It is interesting to note that the adsorption enthalpies Delta H-A degrees for the short chain alkane probes are nearly the same as their liquefaction energies. Using the second IGC approach, i.e., at finite concentration, the isotherms for the adsorption of n-octane and n-hexylamine on the three selected Kevlar(R) fibers were constructed by the one-peak method. These are shown to be instrumental to establish the corresponding energy distribution functions. The results may indicate that, unlike the alkane probes, the polar molecules interact strongly with the Kevlar(R) fiber surfaces, which appear, in this case, energetically heterogeneous. The resulting energy distribution mapping opens new avenues towards the surface characterization of the global surface without the restriction of the averaging imposed by other bulk analysis techniques. (C) 1998 John Wiley & Sons, Inc. [References: 29]
机译：已使用两种反相气相色谱（IGC）技术系统地研究了三种Kevlar®纤维的表面能特性，即以无限探针稀释度和有限探针浓度进行分析，后者允许对表面能进行唯一映射水平，这极大地补充了最高能量位点的传统特征。标准热力学参数，例如自由能-Delta G（A）度，吸附焓和熵（Delta HA度和-Delta SA度）以及分散成分和特定成分（beta（s）（ d）和纤维表面能的Delta G（sp）/ I-sp）由各种极性的选定分子在零覆盖下的保留行为确定。三根光纤在50摄氏度时的gamma（s）（d）值在49-58 mJ m（-2）之间。通过三种不同方法计算得出的极性分量Delta G（sp）或I-sp纤维表面的极性特征。有趣的是，短链烷烃探针的吸附焓Delta H-A度几乎与它们的液化能相同。使用第二种IGC方法，即在有限浓度下，通过单峰方法构造了在三种选择的Kevlar纤维上吸附正辛烷和正己胺的等温线。这些被证明有助于建立相应的能量分配功能。结果可能表明，与烷烃探针不同，极性分子与Kevlar？纤维表面强烈相互作用，在这种情况下，它们在能量上似乎是异质的。由此产生的能量分布图为全局表面的表面表征开辟了新途径，而不受其他整体分析技术所施加的平均值的限制。 （C）1998 John Wiley＆Sons，Inc. [参考：29]

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