Qauv Txheej Yas
| E23.1501Qauv Txheej Yas | |||
| 01 | Roj av | 07 | Kev cais tawm tsis zoo |
| 02 | Castoroil | 08 | Polyethylene |
| 03 | Cais | 09 | Polypropylene |
| 04 | Additive | 10 | PVC |
| 05 | Kev daws teebmeem | 11 | Polystyrene |
| 06 | Cais | . | . |
Yas yog polymer compound (macromolecules) uas yog polymerized los ntawm sib ntxiv polymerization lossis polycondensation cov tshuaj tiv thaiv nrog monomers ua cov ntaub ntawv raw. Nws lub peev xwm los tiv thaiv deformation yog nruab nrab. Nws yog nruab nrab ntawm cov roj hmab thiab roj hmab. Nws muaj li ntawm cov khoom siv hluavtaws thiab cov ntim khoom, tshuab yas, thiab cov tshuab ua kom khov. Nws muaj li ntawm cov khoom siv ntxiv xws li tus neeg sawv cev, roj nplua nyeem, thiab xim.
Lub ntsiab ntawm cov yas yog yas. Resin yog hais txog kev sib xyaw polymer uas tsis tau tov nrog ntau cov tshuaj ntxiv. Lub sij hawm cob xub yog npe lub npe rau cov lipids zais cia los ntawm cov nroj tsuag thiab tsiaj, xws li rosin thiab shellac. Cov nyiaj suav muaj li ntawm 40% txog 100% ntawm qhov nyhav tag nrho ntawm cov yas. Cov cuab yeej yooj yim ntawm cov yas yog tsuas yog txiav txim siab los ntawm cov xwm ntawm cov khoom siv, tab sis cov quav ntxiv kuj ua lub luag haujlwm tseem ceeb. Qee qhov plastics yog qhov pib ua tiav ntawm cov hluavtaws yas, tsis muaj lossis tsawg ntxiv rau, xws li plexiglass, polystyrene, thiab lwm yam.
