Bioplastics yog cov ntaub ntawv yas ua los ntawm biomass es tsis txhob siv roj av thiab cov nkev ntuj.Lawv yog cov phooj ywg zoo ib puag ncig tab sis zoo li tsis tshua muaj zog thiab yoog raws li cov khoom siv niaj hnub.Lawv kuj tsis tshua ruaj khov thaum raug tshav kub.
Hmoov zoo, cov kws tshawb fawb ntawm University of Akron (UA) tau pom txoj kev daws teeb meem rau qhov kev tsis txaus siab kawg no los ntawm kev mus dhau lub peev xwm ntawm bioplastics.Lawv txoj kev loj hlob tuaj yeem ua rau muaj txiaj ntsig zoo rau kev ruaj ntseg ntawm cov yas yav tom ntej.
Shi-Qing Wang, PhD lab ntawm UA, tab tom tsim cov tswv yim zoo rau kev hloov cov khoom siv polymers rau hauv cov ntaub ntawv nruj thiab hloov tau.Pab pawg tsim kho tshiab kawg yog polylactic acid (PLA) khob qauv uas muaj zog heev, pob tshab, thiab yuav tsis ntsws lossis deform thaum ntim dej kub.
Yas tau dhau los ua ib feem tseem ceeb ntawm peb lub neej niaj hnub, tab sis feem ntau ntawm nws tsis tuaj yeem rov ua dua thiab yog li khaws cia hauv qhov chaw pov tseg.Qee qhov kev cog lus biodegradable / compostable lwm txoj xws li PLA feem ntau tsis muaj zog txaus los hloov cov fossil roj raws li cov polymers xws li polyethylene terephthalate (PET) vim tias cov khoom siv ruaj khov no yog crunchy heev.
PLA yog ib hom bioplastic nrov siv hauv ntim thiab cov tais diav vim nws pheej yig los tsim.Ua ntej Wang lub chaw sim ua qhov no, kev siv PLA raug txwv vim nws tsis tuaj yeem tiv taus qhov kub thiab txias.Tias yog vim li cas qhov kev tshawb fawb no tuaj yeem ua rau muaj kev cuam tshuam rau PLA kev ua lag luam.
Dr. Ramani Narayan, tus kws tshawb fawb txog bioplastics muaj npe nrov thiab tus kws tshaj lij ntawm Michigan State University, tau hais tias:
PLA yog lub ntiaj teb ua 100% biodegradable thiab tag nrho compostable polymer.Tab sis nws muaj kev cuam tshuam lub zog tsawg thiab tsis tshua muaj cua sov distortion kub.Nws softens thiab lov raws li structurally ntawm 140 degrees F, ua rau nws tsis haum rau ntau hom khoom noj khoom haus kub ntim thiab ntim ntim.Dr. Wang txoj kev tshawb fawb tuaj yeem yog kev siv thev naus laus zis vim nws qhov qauv PLA khob muaj zog, pob tshab, thiab tuaj yeem tuav cov dej kub npau npau.
Pab neeg no rov xav txog cov qauv ntawm PLA yas ntawm qib molecular kom ua tiav cov cua sov ua haujlwm thiab ductility.Cov khoom no yog tsim los ntawm cov saw molecules khi ua ke zoo li spaghetti, intertwined nrog ib leeg.Txhawm rau ua cov thermoplastic muaj zog, cov kws tshawb fawb yuav tsum xyuas kom meej tias crystallization tsis cuam tshuam cov qauv weave.Nws txhais tau hais tias qhov no yog lub sijhawm los khaws tag nrho cov noodles ib zaug nrog ib khub ntawm chopsticks, es tsis yog ob peb noodles uas swb tawm.
Lawv PLA lub khob yas qauv tuaj yeem tuav dej tsis muaj decomposing, shrinking los yog ua opaque.Cov khob no tuaj yeem siv los ua ib puag ncig zoo dua rau kas fes lossis tshuaj yej.
Post lub sij hawm: Feb-08-2023