Cov neeg ib txwm muaj kev txhawj xeeb txog cov khoom noj khoom ntim yas, thiab qee cov neeg xav tias cov khoom yas tsis ruaj ntseg. Qhov tshwj xeeb tshaj yog thaum cov hnab yas ntim ntawm cov khoom noj ua kua, cov neeg txhawj xeeb yuav ntau dua, ces cov hnab yas ntim ntawm cov kua ua kua?
Feem ntau, cov hnab yas tshwj xeeb uas siv rau zaub mov tsis muaj tshuaj lom vim lawv tau ua los ntawm polyethylene los yog nylon. Cov high-pressure polyethylene zaj duab xis zoo nkaus li thiab pom tau tias zoo nkaus li nyias txheej ntawm paraffin. Nws tseem yog ib coincidence tias cov kab txawv ntawm polyethylene yog tiag tiag zoo li mus rau ntawm paraffin, tshwj tsis yog hais tias lub moj khaum molecular ntawm polyethylene yog loj dua tshaj ntawm paraffin, thiab nylon zaj duab xis yog muaj zog dua polyethylene zaj duab xis. Tab sis tus nqi ntau dua, yog li ntawv tsis yog li ntawd.
Cov yas polyethylene, polypropylene, polyester, polystyrene, thiab lwm yam siv tam sim no siv cov ntim khoom noj khoom haus yog tsim nyog rau kev ua kom zoo thiab muaj kev ruaj ntseg rau cov zaub mov.
