Abstract
AbstractPolyurethane reactive hot-melt adhesives (PURHs) are frequently employed in industries; however, there is still a need to develop more sustainable and versatile methodologies to expand the functions and fabrication of these important materials. Renewable feedstock can give PURHs with new functions, and reduce environmental impact. This study focuses on synthesizing PURHs using polyols derived from biomass (plants) and greenhouse gas (CO2) resources. These PURHs were characterized by multiple techniques, including solid-state 13C nuclear magnetic resonance (NMR), a dynamic mechanical analysis (DMA), single-lap adhesive joints strength of stainless steel, and hydrolytic ageing. The PURH film based on biomass poly(tetramethylene ether) glycol (bio-PTMEG) exhibited better water vapor permeability, tensile strength, and adhesive joints properties than PURHs based on cashew nutshell liquid (CNSL) polyester diol and poly(propylene carbonate)-poly(propylene glycol) (PPC-PPG) copolymer diol. The polyols blend of bio-PTMEG with biomass and CO2 based polycarbonate diols respectively provided PURHs films excellent hydrolysis resistance and adhesive strength on single-lap adhesively bonded stainless steel specimens. The work herein demonstrates that various renewable polyols can be employed in a sustainable fashion to optimize the structures and properties of PURHs for important applications.
Highlights
Introduction can givePolyurethanes reactive hot-melt adhesives (PURHs) with new functions, and reduce envi- are 100% solid, isocyanate-terminated urethane ronmental impact
A series of moisture-cured PURHs were synthesized from the biomass and CO2 based polyols, and examined these PURHs on chemical, physical, mechanical and adhesive joints properties
The usage of bio-PTMEG imparted the PURH with better wetting tension, Water vapor transmission rate (WVTR), tensile strength and SS-to-SS joints adhesive strength than the cashew nutshell liquid (CNSL) based polyester diol and PPC-PPG copolymer diol be used for PURH
Summary
PURHs with new functions, and reduce envi- are 100% solid, isocyanate-terminated urethane ronmental impact. This study focuses on synthesizing prepolymers that are synthesized by reacting polyols. PURHs using polyols derived from biomLeatssF(pdleannotst)e aand eldwiatnhdexlceetsVs isdoecnyaonteatae (vSecchteomr esp1)a(c1e). The polyols blend o(sfebeio[-1P1T,MLeEmG wmiath14.8d]e)v;e(lvo)ptehdefLasetoandahrdespivaeirstcroenngsitshtiwnigthofinacnryeatswinogojfoianmedodular Leonard biomass and CO2 based polycarbonateDdeiolnsirteiospne1c.t4iv]e);ly(vi)atshseemLbeloiensaprrdodpuacitrivciotyn(s4i)s.tIinngcoonftraaspta, piroolyfeothpepropsoiltyeolgse, nerators for th provided PURHs films excellent hydrolybsrisa,reascistitnangcoenanand evsaulcuhataisopnomlyo(pdruolpey(lesneee g[5ly,cPorlo) p(PoPsGit)i,oanre9u.2s]e)d. Let {θi}di= denorteesoausrtcaendmaarkdesoridt eproinssgibolfethtoe ediegveenlovpaltuhees pooflAyo. lTshwenithA, A∗ is self-du * Corresponding author: Cheng-Hung Chung, GirsadausatteaInndstaitrudteoofrderinnegwoffutnhcetieoingse,nwvahliuchesaoref Ale∗ss(saecece[s7s,iPblreopvioasipteiotrnol8e.u7m]).Precision Manufacturing, National Chin-Yi University of Technology, based products. These polyols derived from plant source (e.g., bio-based acids and diols, natural oil polyols, etc.)
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