Niaj hnub no, kuv yuav qhia koj luv luv txog keeb kwm ntawm cov yas.

Cov yas ua los ntawm tib neeg thawj zaug yog cov phenolic resin uas ua los ntawm American Baekeland nrog phenol thiab formaldehyde hauv xyoo 1909, tseem hu ua Baekeland yas. Cov phenolic resins yog ua los ntawm cov tshuaj tiv thaiv condensation ntawm phenols thiab aldehydes, thiab koom nrog cov thermosetting plastics. Cov txheej txheem npaj tau muab faib ua ob kauj ruam: thawj kauj ruam: thawj zaug polymerize rau hauv ib qho compound nrog qib qis linear ntawm polymerization; kauj ruam thib ob: siv kev kho kub siab los hloov nws mus rau hauv ib qho polymer compound nrog qib siab ntawm polymerization.
Tom qab ntau tshaj ib puas xyoo ntawm kev txhim kho, cov khoom yas tam sim no nyob txhua qhov chaw thiab txuas ntxiv loj hlob ntawm qhov nrawm txaus ntshai. Cov roj hmab ntshiab yuav tsis muaj xim thiab pob tshab lossis dawb hauv qhov tsos, yog li cov khoom tsis muaj cov yam ntxwv pom tseeb thiab zoo nkauj. Yog li ntawd, kev muab cov khoom yas ci xim tau dhau los ua lub luag haujlwm tsis zam ntawm kev lag luam ua cov yas. Vim li cas cov yas thiaj li tsim kho sai heev hauv 100 xyoo xwb? Feem ntau vim nws muaj cov txiaj ntsig hauv qab no:

1. Cov yas tuaj yeem tsim tau ntau yam. (Los ntawmpwm yas)

2. Qhov ceev ntawm cov yas yog lub teeb thiab lub zog siab.

3. Yas muaj kev tiv thaiv xeb.

4. Yas muaj cov khoom rwb thaiv tsev zoo thiab cov khoom rwb thaiv tsev kub.

Muaj ntau hom yas. Cov thermoplastics feem ntau yog dab tsi?

1. Polyvinyl chloride (PVC) yog ib qho ntawm cov yas siv dav dav. Ntawm tsib lub yas zoo tshaj plaws hauv ntiaj teb, nws lub peev xwm tsim khoom yog qhov thib ob tom qab polyethylene. PVC muaj qhov nyuaj thiab tiv taus corrosion zoo, tab sis tsis muaj elasticity, thiab nws cov monomer muaj tshuaj lom.

2. Polyolefin (PO), feem ntau yog polyethylene (PE) thiab polypropylene (PP). Ntawm lawv, PE yog ib qho ntawm cov khoom yas loj tshaj plaws. PP muaj qhov ceev tsawg, tsis muaj tshuaj lom, tsis muaj ntxhiab thiab tiv taus cua sov zoo. Nws tuaj yeem siv tau ntev ntawm qhov kub txog li 110 degrees Celsius. Pebdiav yasyog ua los ntawm cov khoom noj khoom haus PP.

3. Cov tshuaj styrene, suav nrog polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS) thiab polymethyl methacrylate (PMMA).

4. Polyamide, polycarbonate, polyethylene terephthalate, polyoxymethylene (POM). Hom yas no siv tau ua cov khoom siv rau kev tsim kho, tseem hu ua cov khoom siv engineering.

Kev tshawb pom thiab siv cov yas tau raug sau tseg rau hauv cov ntawv keeb kwm, thiab nws yog qhov thib ob tseem ceeb tsim uas cuam tshuam rau tib neeg hauv xyoo pua 20th. Yas yog qhov txuj ci tseem ceeb hauv ntiaj teb! Niaj hnub no, peb tuaj yeem hais yam tsis muaj kev hais ua kom tiav: "Peb lub neej tsis tuaj yeem sib cais ntawm yas"!