Thaum Lub Yim Hli 8, 2023, kev tshaj tawm ceev ceev hauv phau ntawv Journal Nature tau tshaj tawm cov kev tshawb fawb tshiab los ntawm xibfwb Shuai Li pab neeg los ntawm College of Material Engineering ntawm Fujian Agriculture thiab Forestry University. Pab neeg no tau ua tiav cov txheej txheem kev sib tw ntawm cov tsoos lignin-raws li ntoo nplaum, nrog rau cov txheej txheem npaj nyuaj, cov nqi siab, thiab kev ua haujlwm tsis zoo. Lawv tau siv cov kev ua haujlwm siab lignin los tsim ib qho tshiab ntsuab lignin-raws li ntoo nplaum nrog cov khoom sib txuas zoo, uas qhia tau hais tias kev cog lus yog lwm txoj hauv kev zoo tshaj plaws rau petrochemical-based bulk adhesives.
Engineered wood composites, xws li particle boards, yog dav siv nyob rau hauv ntau yam xws li kev tsim kho thiab kho kom zoo nkauj sab hauv. Tuam Tshoj txoj kev tsim khoom txhua xyoo ntawm cov ntoo engineered tshaj 300 lab cubic meters, nyob rau hauv thawj lub ntiaj teb. Tam sim no, feem ntau siv cov nplaum rau cov ntoo sib xyaw no yog urea-formaldehyde thiab phenol-formaldehyde resins, uas feem ntau vam khom cov peev txheej petrochemical thiab feem ntau raug kev txom nyem los ntawm formaldehyde emissions. Txhawm rau txo qis kev vam khom ntawm cov peev txheej fossil, kev lag luam tau tig nws lub siab los siv lignin los ntawm kev txuas ntxiv lignocellulosic biomass ua ib feem hloov rau phenol, ua rau kev txhim kho lignin-phenol-formaldehyde resins. Txawm li cas los xij, kev lag luam lignin nthuav tawm qhov hnyav hnyav thiab tsis tshua muaj kev cuam tshuam thaum lub sijhawm sib cais, ua rau cov nplaum nrog kev ua haujlwm tsis zoo, cov xim tsaus, tus nqi siab dua, thiab tsis muaj peev xwm kov yeej formaldehyde emissions. Yog li ntawd, muaj kev txaus siab rau kev kawm thiab kev lag luam hauv zej zog los txhim kho cov nqi qis, kev ua haujlwm siab, thiab tsis muaj tshuaj lom ntoo siv cov khoom siv ntsuab thiab cov pa roj carbon tsawg.
Kev tshoov siab los ntawm lignin lub peev xwm los khi cellulose thiab hemicellulose nyob rau hauv lignocellulosic biomass nyob rau hauv ib tug zoo li kua nplaum, xibfwb Shuai Li thiab nws pab neeg tau rho tawm heev nquag lignin los ntawm ntoo thiab ua liaj ua teb residues los tsim ib tug tshiab ntsuab lignin-raws li ntoo nplaum. Nrog rau cov nplaum no, lawv tau ua tiav cov plywood zoo nyob rau hauv qhov dav ntawm qhov kub ntawm 100 txog 190 degrees Celsius, muab qhov zoo xws li ntsuab synthesis, kev ua haujlwm yooj yim, kev ua haujlwm zoo, thiab tus nqi qis.
Microscopic interface characterization qhia tau hais tias lub adhesion mechanism ntawm lignin-raws li ntoo nplaum feem ntau muaj lignin softening thiab nkag mus thiab sau cov softened lignin rau hauv intercellular qhov chaw xws li cov hlab ntsha. Siv cov tswv yim xws li ob-dimensional nuclear magnetic resonance thiab micro-infrared spectroscopy, nws tau pom tias lignin hauv cov nplaum ua rau hauv-situ tus kheej-crosslinking thiab cov ntaub ntawv crosslinks nrog cov haiv neeg lignin hauv cov phab ntsa ntawm cov nroj tsuag. Zuag qhia tag nrho, lignin-raws li nplaum ua tiav ob qho tib si lub cev thiab tshuaj sib txuas ntawm qhov sib cuam tshuam, ua kom muaj txiaj ntsig zoo ntawm cov khoom siv ntoo ntsuab, cov pa roj carbon tsawg.
Cov kab lus nthuav dav no muab cov ncauj lus kom ntxaws ntxiv thiab kev kawm piav qhia txog kev txhim kho ntawm lignin-raws li ntoo nplaum tshiab. Kev tshawb fawb ua los ntawm xib fwb Shuai Li pab neeg muaj kev nkag siab zoo rau hauv txoj kev npaj thiab kev sib koom ua ke ntawm cov nplaum ntsuab no. Nws paves txoj kev rau daim ntawv thov ntawm lignin-raws li ntoo adhesives nyob rau hauv engineered ntoo kev lag luam. Cov kev tshawb pom muaj cov txiaj ntsig tseem ceeb ntawm kev kawm thiab kev siv tau zoo, ua rau kev nce qib ntawm lignin-based adhesive technology thiab kev ua tiav ntawm cov hom phiaj kev txhim kho kom ruaj khov.