Ionic Liquid Functionalized Silica Aerogels as Reinforcing Agents for Epoxy Nanocomposites

Makaleler > Tam Makale · 2021

Yazarlar: Selay SERT ÇOK, Hasan Yavuz ÜNAL, FATOŞ KOÇ, Yeliz PEKBEY, Nilay GİZLİ

JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2021, cilt 31, ss 2445-2458

DOI: 10.1007/s10904-020-01841-x

Özet

<p>In&nbsp;this&nbsp;study,&nbsp;the&nbsp;effect&nbsp;of&nbsp;ionic&nbsp;liquid&nbsp;embedded&nbsp;silica&nbsp;aerogels&nbsp;on&nbsp;the&nbsp;mechanical&nbsp;properties&nbsp;of&nbsp;epoxy&nbsp;composites&nbsp;was</p><p>investigated.&nbsp;The&nbsp;study&nbsp;consisted&nbsp;of&nbsp;two&nbsp;parts.&nbsp;In&nbsp;the&nbsp;first&nbsp;part,&nbsp;silica&nbsp;aerogels&nbsp;were&nbsp;synthesized&nbsp;by&nbsp;one-step&nbsp;sol–gel&nbsp;method</p><p>and&nbsp;dried&nbsp;by&nbsp;supercritical&nbsp;drying.&nbsp;Two&nbsp;different&nbsp;silica&nbsp;aerogel&nbsp;powders&nbsp;with/without&nbsp;ionic&nbsp;liquid&nbsp;were&nbsp;prepared&nbsp;to&nbsp;investigate</p><p>the&nbsp;effect&nbsp;of&nbsp;ionic&nbsp;liquid&nbsp;both&nbsp;on&nbsp;the&nbsp;physicochemical&nbsp;characteristics&nbsp;and&nbsp;the&nbsp;dispersion&nbsp;behavior&nbsp;of&nbsp;the&nbsp;silica&nbsp;aerogel.</p><p>Various&nbsp;analyses&nbsp;such&nbsp;as&nbsp;FTIR,&nbsp;SEM/EDX,&nbsp;TGA,&nbsp;PSD&nbsp;and&nbsp;Zeta&nbsp;Potential&nbsp;analysis&nbsp;were&nbsp;conducted&nbsp;in&nbsp;order&nbsp;to&nbsp;investigate</p><p>the&nbsp;effect&nbsp;of&nbsp;the&nbsp;contribution&nbsp;of&nbsp;ionic&nbsp;liquid&nbsp;on&nbsp;the&nbsp;physicochemical&nbsp;and&nbsp;textural&nbsp;structures&nbsp;of&nbsp;these&nbsp;powders&nbsp;and&nbsp;to&nbsp;identify</p><p>the&nbsp;surface&nbsp;charge&nbsp;characteristics&nbsp;of&nbsp;the&nbsp;aerogels.&nbsp;According&nbsp;to&nbsp;characterization&nbsp;results,&nbsp;silica&nbsp;aerogels&nbsp;prepared&nbsp;by&nbsp;including</p><p>ionic&nbsp;liquid,&nbsp;resulted&nbsp;in&nbsp;superior&nbsp;characteristics&nbsp;with&nbsp;lower&nbsp;density&nbsp;(0.16&nbsp;g/cm3),&nbsp;higher&nbsp;porosity&nbsp;(93%),&nbsp;higher&nbsp;thermal</p><p>stability&nbsp;(up&nbsp;to&nbsp;400&nbsp;°C),&nbsp;higher&nbsp;zeta&nbsp;potential&nbsp;value&nbsp;(28&nbsp;mV)&nbsp;and&nbsp;smaller&nbsp;average&nbsp;particle&nbsp;diameter&nbsp;(40&nbsp;nm).&nbsp;In&nbsp;the&nbsp;second</p><p>part,&nbsp;silica&nbsp;aerogel-epoxy&nbsp;nanocomposites&nbsp;were&nbsp;produced&nbsp;by&nbsp;changing&nbsp;silica&nbsp;aerogel&nbsp;content&nbsp;and&nbsp;mechanical&nbsp;analyses&nbsp;of&nbsp;the</p><p>composites&nbsp;were&nbsp;conducted.&nbsp;To&nbsp;examine&nbsp;the&nbsp;mechanical&nbsp;properties&nbsp;of&nbsp;nanocomposites,&nbsp;tensile&nbsp;and&nbsp;three-point&nbsp;bending&nbsp;tests</p><p>were&nbsp;performed.&nbsp;The&nbsp;results&nbsp;have&nbsp;shown&nbsp;that&nbsp;the&nbsp;composites&nbsp;containing&nbsp;1&nbsp;wt%&nbsp;ionic&nbsp;liquid&nbsp;in&nbsp;silica&nbsp;aerogel&nbsp;had&nbsp;superior</p><p>modulus&nbsp;of&nbsp;elasticity&nbsp;(4156.27&nbsp;MPa)&nbsp;and&nbsp;tensile&nbsp;strength&nbsp;(51.96&nbsp;MPa)&nbsp;compared&nbsp;to&nbsp;that&nbsp;of&nbsp;neat&nbsp;epoxy&nbsp;which&nbsp;had&nbsp;the&nbsp;elasticity</p><p>modulus&nbsp;of&nbsp;3538.08&nbsp;MPa&nbsp;and&nbsp;tensile&nbsp;strength&nbsp;of&nbsp;47.98&nbsp;MPa.</p>

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