Muaj ntau yam khoom siv yas hauv chav kuaj, thiab muaj ntau hom khoom siv yas. Cov yas sib txawv muaj lawv tus yam ntxwv, thiab lawv lub cev thiab tshuaj lom neeg sib txawv heev. Yog li ntawd, kev xaiv cov khoom siv yog qhov tseem ceeb tshwj xeeb. Dab tsi yog hom yas siv los ntawm cov chaw tsim khoom siv thiab qhov sib txawv yog dab tsi?
Polyolefins
Polyethylene (PE):
Polyethylene belongs rau qeb ntawm polyolefins, uas yog siab molecular hnyav hydrocarbons. Kev faib tawm tuaj yeem muab faib ua ntau yam polyethylene, siab ntom polyethylene, linear low density polyethylene, thiab lwm yam. High density polyethylene (HDPE) muaj qhov qis qis tshaj plaws, cov qauv muaj zog, qis dua pob tshab, thiab qis permeability piv rau tsawg ntom polyethylene (LDPE). Vim nws cov qib high branching, tsawg ntom molecular qauv, cov ntaub ntawv mos, thiab siab transparency, LDPE cov ntaub ntawv feem ntau yog siv thaum ua cov khoom uas yuav tsum tau elasticity, xws li droppers, lub raj mis ntxuav, thiab hais txog.
Ntxiv rau cov HDPE thiab LDPE, kuj tseem muaj cov kab uas tsis tshua muaj ntom ntom polyethylene (LLDPE), uas sib txuas cov rigidity ntawm high-density polyethylene thiab toughness ntawm tsawg ntom polyethylene nrog rau lwm cov ntaub ntawv txhim kho nrog cov khoom muaj zog.
Polypropylene (PP):
Polypropylene thiab polyethylene yog cov polymers uas zoo ib yam li olefins. Piv rau polyethylene, ib H atom ntawm txhua ethylene molecule yog hloov los ntawm ib pawg methyl. Polypropylene yog cov khoom siv translucent, qhov sib txawv loj tshaj plaws los ntawm polyethylene yog tias nws tuaj yeem tiv taus qhov kub thiab txias siab ua kom tsis muaj menyuam. Polypropylene muaj qhov cuam tshuam rau cov oxidants muaj zog dua li polyethylene, tab sis nws cov hardness yog muaj zog dua polyethylene, thiab nws muaj qhov zoo tshaj plaws tiv thaiv kev ntxhov siab tawg hauv polyolefins. Txawm hais tias polypropylene muaj qhov kub thiab txias tsis kam, nws qhov kub thiab txias kuj tseem siab heev. Tsuas yog nyob ntawm 0 degree, cov yas yuav dhau los ua nkig, thiab yog tias muaj kev cuam tshuam loj sab nraud rau lub sijhawm no, nws yuav ua rau muaj kev puas tsuaj.
Polystyrene (PS):
Nws yog polymerized los ntawm styrene, thiab polystyrene yog tsim los ntawm kev hloov ib hydrogen atom nyob rau hauv polyethylene nrog phenyl. Polystyrene muaj lub siab transparency, zoo optical transmittance, thiab zoo deg kev hloov kho, yog li nws yog feem ntau siv raws li ib tug consumable rau cell kab lis kev cai thiab raws li ib tug enzyme daim ntawv lo phaj. Txawm li cas los xij, polystyrene muaj cov tshuaj tsis zoo, thiab txawm tias tsis muaj zog acids thiab cov hauv paus tsis tuaj yeem zam tau zoo. Tsis tas li ntawd, cov khoom siv polystyrene yog qhov tsis yooj yim thiab yooj yim rau kev sib tsoo kev puas tsuaj ntawm chav tsev kub.
Polypropylene Copolymer (PPCO):
Polypropylene copolymers kuj polymerize polyethylene nyob rau hauv polypropylene, lub hauv paus molecule yog ib chav tsev rov ua ntu zus ntawm ethylene thiab propylene. Polypropylene copolymer muaj cov khoom ntawm polyethylene thiab polypropylene. Nws tsis tsuas yog khaws cov txiaj ntsig zoo ntawm polypropylene qhov tsis kam mus rau qhov kub thiab txias, tab sis kuj tseem muaj cov yam ntxwv ntawm qhov kub thiab txias tsis kam ntawm polyethylene, ua rau polypropylene, uas yog Ameslikas muaj embrittlement, muaj qhov zoo dua qhov kub thiab txias. Tsis tas li ntawd, PPCO kuj muaj qhov tawv ntawm polyethylene, ua rau nws muaj kev ntxhov siab ntau dua.
Polyvinyl chloride (PVC):
Cov qauv molecular mis ntawm polyvinyl chloride zoo ib yam li polyethylene. Ib qho ntawm H atoms yog hloov los ntawm Cl atom. Vim yog cov tshuaj chlorine atom, PVC cov ntaub ntawv muaj kev cuam tshuam ntau dua rau kev cuam tshuam ntawm qee cov kuab tshuaj, tab sis tib lub sijhawm, lawv muaj qhov zoo tshaj plaws hauv lwm yam. PVC muaj cov roj zoo heev (tshwj tsis yog cov roj tsw qab) thiab tsis tshua muaj permeability rau feem ntau cov pa roj. PVC yog lub teeb xiav pob tshab khoom. Cov phab ntsa ntawm PVC nqaim necked fwj yog nyias thiab tuaj yeem khoov me ntsis. Tom qab sib tov phthalate plasticizers, PVC cov ntaub ntawv ua mos thiab hloov tau, thiab tuaj yeem nias rau hauv cov kav dej hloov tau yooj yim.
Cov saum toj no piav txog ntau yam plastics. Hauv cov ntsiab lus, PP thiab PE yog hom yas ntau tshaj plaws hauv chav kuaj, thiab feem ntau lawv tuaj yeem xaiv yog tias tsis muaj kev xav tau tshwj xeeb. Yog tias qhov kev sim yuav tsum muaj qhov kub thiab txias thiab txawm tias yuav tsum tau ua kom tsis muaj zog, PP cov ntaub ntawv tuaj yeem xaiv. Yog tias muaj kev xav tau rau kev ua haujlwm kub qis, PE tuaj yeem xaiv. Yog tias muaj ntau qhov xwm txheej siv dav, nws tuaj yeem txiav txim siab xaiv cov hloov kho polypropylene copolymer. PS cov ntaub ntawv feem ntau yog siv rau hauv kev sim khoom siv xws li cov hlwb.
BKMAM yog cov chaw tsim khoom lag luam rau cov khoom siv hauv chav kuaj, PP cov ntaub ntawv pipette cov lus qhia, centrifuge raj, PP biohazard hnab, PS khoom serological pipettes, cell kab lis kev cai phaj, petri tais diav, PE khoom pasteur pipette, PE reagent fwj, kua sampling hnab thiab lwm yam. zoo siab, tus nqi sib tw tuaj yeem muab.
Txais tos tiv tauj rau cov lus qhia ntxiv!
Hu rau tus neeg: Vera Chan
Mob: plus 86 189 0079 0479(Whatsapp&wechat)
Skype: Vera BKMAM
Email:vera@bkmbio.com