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( John Marc Puguan ),김헌 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A new electrolyte composed of functionalized ZrO<sub>2</sub> and PVdF-HFP polymer complexed with LiCF<sub>3</sub>SO<sub>3</sub> displayed an enhanced ionic conductivity of 1.78 × 10<sup>-3</sup> S cm<sup>-1</sup> and an improved optimum optical transmittance of ~70%. The increase in the electrolyte’s conductivity by 4 orders of magnitude was due to decreased polymer’s crystallinity and enhanced ionization of Li<sup>+</sup> salt caused by ZrO<sub>2</sub>. Electrolyte’s optical transmittance increased doubly due to the reduced ZrO<sub>2</sub> agglomeration caused by the vinyl group-containing ligand attached to ZrO<sub>2</sub>. This new hybrid electrolyte highly suits applications in the synthesis of energy efficient windows.
Nanofibrous Aerogels Derived from Waste PET Bottles for Enhanced Acoustic Absorption and Insulation
John Marc Puguan,김헌 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Polyethyleneterephthalate (PET) waste bottles were converted to nanofibrous aerogels for enhanced acoustic absorption and insulation. Nanofibers generated by facile electrospinning of PET sols were crosslinked with polyvinyl alcohol (PVA) to form a functional aerogel with high porosity. This highly porous media exhibits remarkable sound absorption coefficient which is at par, if not, better than the commercial sound absorbers. Additionally, with minimal thickness, it shows a relatively high sound transmission loss which is superior to previously reported sound insulators. This material also shows good mechanical stability and has an ultra-light weight. By recycling wastes plastics such as PET bottles and converting it to useful materials such as sound absorbers and insulators, this approach may partly address the worsening pollution in the world.
John Marc C. Puguan,김헌 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.74 No.-
A copoly(ionic liquid) (coPIL) based on 1,2,3-triazolium bearing trioxyethylene and tetraoxyethylenespacers was successfully synthesized as electrolyte for all-solid state electrochromic devices (ECD). Thispolyelectrolyte was produced by reacting triethylene glycol (TEG3)-diazide and tetraethylene glycol(TEG4)-dialkyne monomers through a ‘click’ reaction, copper-catalyzed alkyne-azidecycloadditon(CuAAC), and subsequently underwent several alkylation and anion metathesis. The new coPIL bearingethylene glycol fragments exhibited excellent thermal degradation temperature (Td10 = 230 C) and ionicconductivity (s = 8.8 10 5 S cm 1) which resulted to an efficient color switching (tc = 11.8 s andtb = 6.2 s), a high optical contrast (DT = 24%) and a remarkable stability (after 3000 cycles) of a symmetricall-solid-state smart glass window. The structural design of this new polyelectrolyte material and itscorresponding properties make it an excellent electrolyte for many electrochemical devices that requirezero electrolyte leakage.
Poly(vinyl alcohol) Membrane with Surface Immobilized β-Cyclodextrin Synthesis via Glutaraldehyde
Puguan, John Marc C.,Kim, Hern Trans Tech Publications 2012 Advanced materials research Vol.622 No.-
<P>A novel cyclodextrin (CD) grafted polyvinyl alcohol (PVA) material has been synthesized. Beta-cyclodextrin (βCD) is chemically grafted into PVA via glutaraldehyde (GA) in acidic medium (HCl). The reaction mechanism and the membrane surface grafting are confirmed by Fourier Transform Infrared Spectroscopy (FTIR), modulus of elasticity and contact angle determination. An amount of PVA and βCD are dissolved in a pH 3 HCl solution at 90oC with continuous stirring. Glutaraldehyde was slowly added into the clear solution to effect grafting and crosslinking between the PVA and βCD. It was cooled and allowed to stand overnight to eliminate bubbles formed. The clear PVA-GA-βCD material is casted on a glass plate to form membranes which are peeled off after subsequent drying. The grafted and crosslinked membrane showed peaks in the IR spectra confirming the chemical bonding between PVA, GA and βCD. PVA-GA-βCD membrane is 6% stronger than the physically blended membrane as shown by the increase of its modulus of elasticity. Likewise, a reduction in the hydrophilicity is observed by the newly synthesized membrane as shown by the increase of the membrane’s contact angle.This newly developed material with immobilized βCD may significantly improve the performance of PVA-CD pervaporation membranes by reducing the phase separation phenomenon due to agglomeration of CD in high concentrations as well as preventing βCD from dissolving in aqueous feed. Moreover, this may open new perspective for the development of high performance nanofibers and other nanomaterialssuch as drug delivery system materials and inclusion complexes.</P>
Puguan, John Marc C.,Jadhav, Amol R.,Boton, Lilian B.,Kim, Hern Elsevier 2018 Solar energy materials and solar cells Vol.179 No.-
<P><B>Abstract</B></P> <P>A fast-switching all-solid state symmetrical electrochromic device was successfully fabricated using poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) as electrode and a poly(ionic liquid) based on 1,2,3-triazole with oxyethylene spacer as solid electrolyte. PEDOT:PSS solution was spincoated on ITO glass and annealed to obtain the electrode layers. Two different types of electrolyte were synthesized via copper-catalyzed alkyne-azide cycloaddition (CuAAC) using novel azide/alkyne-terminal monomers. These newly developed main-chain 1,2,3-triazole-based poly(ionic liquid)s having variable spacer length underwent quaternization using methyl iodide and subsequently allowed to make anion exchange with lithium bis(trifluoromethane)sulfonimide salt to obtain PILs with remarkable properties. The PIL bearing [–(CH<SUB>2</SUB>CH<SUB>2</SUB>O)<SUB>6</SUB>–] spacer showed a conductivity of 1.20 × 10<SUP>−4</SUP> S cm<SUP>−1</SUP> which is at par with best side-chain PILs in literature and it efficiently switches an electrochromic device (ECD) with 22% optical contrast from its transparent state to a colored state in 2.5 s and 3.2 s to return to its bleached state. Likewise, it exhibits excellent thermal and mechanical stability that is ideal for practical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PILs with variable oxyethylene spacer were synthesized via click chemistry. </LI> <LI> Extended oxyethylene fragments significantly increased PIL’s ionic conductivity. </LI> <LI> Remarkably high ionic conductivity (σ = 1.20 × 10<SUP>−4</SUP> S cm<SUP>−1</SUP>) for main-chain PIL. </LI> <LI> All-solid state electrochromic device was successfully fabricated. </LI> <LI> Fast-switching ECD with ΔT = 22% and 2.5–3.2 s response time. </LI> </UL> </P>
Puguan, John Marc C.,Chung, Wook-Jin,Kim, Hern Elsevier 2016 ELECTROCHIMICA ACTA Vol.196 No.-
<P><B>Abstract</B></P> <P>Polyvinylidene fluoride-co-hexafluoropropylene (PVdF-HFP) composite polymer electrolyte loaded with 3-isocyanatopropyltriethoxysilane (IPTES) functionalized zirconium oxide (ZrO<SUB>2</SUB>) nanoparticles is successfully synthesized and evaluated for electrochromic application. Incorporation of ZrO<SUB>2</SUB> into the polymeric substrate enhances the ionic conductivity of the electrolyte. Meanwhile, the functionalization of ZrO<SUB>2</SUB> nanoparticles with IPTES ligand enhances the electrolyte’s optical transmissivity. The amount of ligand and its time of reaction with ZrO<SUB>2</SUB> are found to affect the overall property of the electrolyte. The electrolyte exhibits a balance of low crystallinity and low ZrO<SUB>2</SUB> aggregation and agglomeration resulting to a potential next generation electrolyte for energy efficient windows.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Puguan, John Marc C.,Boton, Lilian B.,Kim, Hern Elsevier 2018 Solar energy materials and solar cells Vol.188 No.-
<P><B>Abstract</B></P> <P>Main-chain poly(ionic liquid)s based on 1,2,3-triazole with pentaoxyethylene spacer was developed via copper-catalyzed alkyne-azide cycloaddition (CuAAC) of a novel azide/alkyne-terminal monomer and subsequently quaternized by alkyl halides followed by anion exchanges with several fluorinated salts. Introduction of the extended ethylene oxide fragments [–(CH<SUB>2</SUB>CH<SUB>2</SUB>O)<SUB>5</SUB>–] has made this new PIL with methyl substituent and bis(trifluoromethane)sulfonimide counteranion exhibit ionic conductivity of 1.16 × 10<SUP>−4</SUP> S cm<SUP>−1</SUP> at 30 °C. This new electrolyte efficiently switches an electrochromic device (ECD) with 18% optical contrast from its transparent state to a colored state in 4.75 s and while bleaching takes 11.8 s. The development of this polyelectrolyte with simple structure and excellent physical and thermal properties is promising for the design of new all-solid state energy efficient smart windows and devices and other electrochemical device applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ionene with pentaoxyethylene spacer was synthesized via cycloaddition reaction. </LI> <LI> [–(CH<SUB>2</SUB>CH<SUB>2</SUB>O)<SUB>5</SUB>–] fragments on the main chain enhanced the PIL's ionic conductivity. </LI> <LI> Easy tunability of ionic conductivity and structure of ionenes. </LI> <LI> New series of PILs exhibit excellent thermal and mechanical properties. </LI> <LI> Fabricated ECD which efficiently switches from bleached to colored state. </LI> </UL> </P>
( John Marc Puguan ),김헌 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Polyvinylidene fluoride-co-hexafluoropropylene (PVdF-co-HFP) composite polymer electrolyte doped with 3-isocyanatopropyltriethoxysilane (IPTES) functionalized zirconium oxide (ZrO2) nanoparticles was successfully synthesized and evaluated for electrochromic application. Incorporation of ZrO2 into the polymeric substrate enhances the ionic conductivity of the electrolyte. Meanwhile, the functionalization of ZrO2 nanoparticles with IPTES ligand enhances its optical transmissivity. The amount of ligand and its time of reaction with ZrO2 were found to be vital parameters in the overall property of the electrolyte and its performance. The electrolyte exhibited a balance of low crystallinity and low ZrO2 aggregation and agglomeration resulting to an ideal electrolyte for electrochromic devices (ECDs).