Styrene-butadiene roj hmab (SBR) yog cov roj hmab hluavtaws siv dav tshaj plaws thiab tuaj yeem tsim los ntawm copolymerization ntawm butadiene (75%) thiab styrene (25%) siv cov dawb radical pib.Ib qho random copolymer tau txais.Lub microstructure ntawm cov polymer yog 60% -68% trans, 14% -19% cis, thiab 17% -21% 1,2-.Cov txheej txheem ntub dej feem ntau yog siv los ua tus yam ntxwv ntawm polybutadiene polymers thiab copolymer.Solid-state NMR muab txoj hauv kev yooj yim dua los txiav txim siab txog polymer microstructure.
Tam sim no, ntau SBR yog tsim los ntawm copolymerizing ob monomers nrog anionic los yog kev sib koom catalysts.Cov tsim copolymer muaj cov khoom siv kho tshuab zoo dua thiab qhov nqaim molecular hnyav faib.Ib qho random copolymer nrog kev txiav txim ib ntus kuj tuaj yeem ua rau hauv kev daws teeb meem siv butyl-lithium, yog tias ob lub monomers tau them qeeb.Thaiv copolymer ntawm butadiene thiab styrene yuav raug tsim nyob rau hauv kev daws siv kev sib koom tes los yog anionic catalysts.Butadiene polymerizes ua ntej kom txog thaum nws tau noj, ces styrene pib polymerize.SBR tsim los ntawm kev sib koom ua ke catalysts muaj zog tensile zoo dua qhov uas tsim los ntawm cov dawb radical pib.
Kev siv tseem ceeb ntawm SBR yog rau kev tsim cov log tsheb.Lwm yam kev siv xws li khau, txheej, ntaub pua plag, thiab nplaum.
Feature
Hnav tsis kam, kev laus ua haujlwm, dej tsis kam thiab huab cua nruj zoo dua li cov roj hmab ntuj, thaum adhesion, elasticity thiab deformation calorific nqi qis dua cov roj hmab ntuj.Styrene butadiene roj hmab muaj cov khoom zoo heev.Nws yog qhov loj tshaj plaws ntawm cov roj hmab hluavtaws, thiab nws cov khoom tso nyiaj rau 60% ntawm cov roj hmab hluavtaws.Txog 87% ntawm styrene butadiene roj hmab tsim muaj peev xwm nyob hauv lub ntiaj teb siv emulsion polymerization.Feem ntau hais lus, styrene butadiene roj hmab feem ntau yog hais txog emulsion polymerized styrene butadiene roj hmab.Emulsion polymerized styrene butadiene roj hmab kuj suav nrog kub kub emulsion polymerization ntawm butadiene styrene thiab kub kub emulsion polymerization ntawm txias butadiene.
Siv
Siv los ua daim txhuam cev roj hmab, impregnated fiber ntau thiab ntaub, kuj siv los ua nplaum, txheej thiab lwm yam.
Lub sij hawm xa tuaj: Mar-10-2022