In this study, silanized cardboard samples (HSi-CB, MeSi-CB, EtSi-CB, and PrSi-CB) were prepared by reacting bare cardboard with ethoxysilane/chlorosilanes bearing different substituents (H-, CH3-, CH3CH2-, and CH3CH2CH2-) in toluene. Characterization using FTIR spectroscopy, elemental analysis, and surface area/pore volume measurements confirmed successful silanization, with HSi-CB exhibiting the largest amount of grafted silanes and branched polymeric/oligomeric siloxane networks. However, inverse gas chromatography (IGC) revealed that MeSi-CB exhibited the highest adsorption affinity toward hydrocarbons due to its larger dispersive surface energy <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10337_2025_4434_Article_IEq1.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">$\left( {\mathop \gamma \nolimits_{{\text{S}}}^{{\text{D}}} } \right)$</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close=")" open="("> <msubsup> <mi>γ</mi> <mrow> <mtext>S</mtext> </mrow> <mtext>D</mtext> </msubsup> </mfenced> </math></EquationSource> </InlineEquation> , resulting from grafted methylsilane groups, reduced hydroxyl groups, and the formation of micropores and channels via siloxane condensation. In contrast, EtSi-CB and PrSi-CB displayed lower <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10337_2025_4434_Article_IEq2.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$\mathop \gamma \nolimits_{{\text{S}}}^{{\text{D}}}$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mi>γ</mi> <mrow> <mtext>S</mtext> </mrow> <mtext>D</mtext> </msubsup> </math></EquationSource> </InlineEquation> values due to the grafting of fewer silane groups and the limited formation of branched siloxane networks. Although HSi-CB exhibited the highest amount of silanes, its <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10337_2025_4434_Article_IEq3.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">$\gamma_{{\text{s}}}^{{\text{D}}}$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mi>γ</mi> <mrow> <mtext>s</mtext> </mrow> <mtext>D</mtext> </msubsup> </math></EquationSource> </InlineEquation> values remained comparable to those of bare cardboard. These results underscore the critical role of surface dispersive components and micropore/channel formation in boosting the adsorption performance of silanized cardboard. These results also provide valuable insights for the development of more efficient adsorbents for hydrocarbon capture and separation applications.

Effects of Silane Chemical Structures on the Surface Properties of Silanized Cardboard: Inverse Gas Chromatography and Complementary Analysis

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发表日期：

2025年8月22日

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Joonyeong Kim

摘要

In this study, silanized cardboard samples (HSi-CB, MeSi-CB, EtSi-CB, and PrSi-CB) were prepared by reacting bare cardboard with ethoxysilane/chlorosilanes bearing different substituents (H-, CH₃-, CH₃CH₂-, and CH₃CH₂CH₂-) in toluene. Characterization using FTIR spectroscopy, elemental analysis, and surface area/pore volume measurements confirmed successful silanization, with HSi-CB exhibiting the largest amount of grafted silanes and branched polymeric/oligomeric siloxane networks. However, inverse gas chromatography (IGC) revealed that MeSi-CB exhibited the highest adsorption affinity toward hydrocarbons due to its larger dispersive surface energy $\left( {\mathop \gamma \nolimits_{{\text{S}}}^{{\text{D}}} } \right)$ $(γ_{S}^{D})$ , resulting from grafted methylsilane groups, reduced hydroxyl groups, and the formation of micropores and channels via siloxane condensation. In contrast, EtSi-CB and PrSi-CB displayed lower $\mathop \gamma \nolimits_{{\text{S}}}^{{\text{D}}}$ $γ_{S}^{D}$ values due to the grafting of fewer silane groups and the limited formation of branched siloxane networks. Although HSi-CB exhibited the highest amount of silanes, its $\gamma_{{\text{s}}}^{{\text{D}}}$ $γ_{s}^{D}$ values remained comparable to those of bare cardboard. These results underscore the critical role of surface dispersive components and micropore/channel formation in boosting the adsorption performance of silanized cardboard. These results also provide valuable insights for the development of more efficient adsorbents for hydrocarbon capture and separation applications.