Sebacic acid yog ib tug ntev - saw aliphatic dicarboxylic acid nrog cov mis molecular C₁₀H₁₈O₄, featuring ib pawg carboxyl ntawm txhua qhov kawg ntawm cov molecule. Vim tias muaj ob pawg carboxyl no, sebacic acid tuaj yeem ua rau cov tshuaj tiv thaiv polycondensation nrog hydroxyl- muaj cov khoom sib txuas- xws li diols- thiab yog li siv dav hauv kev npaj cov polyesters, polyurethanes, thiab lwm yam khoom siv polymer. Nws cov txheeb ze molecular loj yog ib qho tseem ceeb parameter thaum npaj kev sim formulations thiab ua raws li theoretical xam.
Raws li cov qauv molecular C₁₀H₁₈O₄, kev suav siv cov txheeb ze atomic masses ntawm 12 rau carbon, 1 rau hydrogen, thiab 16 rau oxygen. Tag nrho cov huab hwm coj yog muab los ntawm summing cov kev koom tes ntawm constituent atoms: 120 rau 10 carbon atoms, 18 rau 18 hydrogen atoms, thiab 64 rau 4 oxygen atoms, ua rau tus nqi ntawm 202. Yog li, cov txheeb ze molecular mass ntawm sebacic acid yog 202 molecular qauv. 202.25 g / mol.
Hauv kev sim xyaum, cov txheeb ze molecular loj yog siv los xam cov khoom siv raw uas yuav tsum tau muaj. Piv txwv li, thaum sebacic acid undergoes polymerization nrog diol, cov txheeb ze molecular masses yog siv los hloov loj rau hauv cov khoom (moles); Cov khoom noj tshwj xeeb yog txiav txim siab raws li qhov xav tau ntawm cov pawg carboxyl rau hydroxyl pawg hauv cov tshuaj tiv thaiv. Kev ua yuam kev tseem ceeb thaum lub sij hawm hnyav lossis hloov pauv ntawm cov khoom siv raw tuaj yeem hloov pauv qhov kev ua haujlwm ntawm pawg, yog li cuam tshuam rau cov txheej txheem polymerization thiab qhov hnyav molecular ntawm cov khoom kawg.
Txawm hais tias qhov txheeb ze molecular loj ntawm sebacic acid yog ib qho tseem ceeb ntawm cov khoom siv hauv cov khoom siv xws li polyesters thiab polyurethanes, nws tuav qhov tseem ceeb hauv kev tsim cov txheej txheem suav. Qhov tseeb xam tus nqi ntawm sebacic acid tso cai rau kev txiav txim siab ntawm lwm cov reactant kom muaj nuj nqis, muab lub hauv paus rau kev sim tsim thiab kev hloov ntawm cov txheej txheem tsis. Yog li ntawd, txhawm rau kom paub tseeb qhov tseeb hauv kev tsim, kev suav yuav tsum ua raws li qhov tseeb purity thiab molecular loj ntawm cov khoom siv raw.