Farqiga viscosity ee PDMS (polydimethylsiloxane, oo sidoo kale loo yaqaan saliid silikoon dimethyl) waxaa inta badan sababa heerka polymerization, iyo sidoo kale wax yar ayaa saameeya qaab dhismeedka molecular (sida nooca kooxaha dhamaadka). Kuwa soo socda waa sharraxaad faahfaahsan oo laga eegayo qaab dhismeedka kiimikada:
Heerka polymerization waa qodobka ugu muhiimsan ee go'aaminaya viscosity PDMS.
Qaab dhismeedka molecular ee PDMS waa silsilad toosan -sida, iyadoo unugga soo noqnoqda uu yahay -Si(CH₃)₂-O-, iyo qaaciidodeeda guud waxa lagu tilmaami karaa sida: (CH₃)₃ halka n ay tahay heerka polymerization (tirada unugyada soo noqnoqda).
Heerka sare ee polymerization ( way sii weyn tahay n): inta ay sii dheeraato silsiladda molecular, way sii xoogaysanaysaa ciidamada van der Waals (inta badan xoogagga kala firdhisan) ee u dhexeeya molecules, iyo heerka sare ee isku-xidhka ee u dhexeeya silsiladaha, taasoo keenta dheecaan liidata iyo viscosity weyn. Heerka hoose ee polymerization (in yar ee n), gaaban silsiladda molecular, daciifinta xoogagga intermolecular, yaraanta isku-dhafan, ayaa ka sii fiicnaanaya dareeraha, iyo hoos u dhigista viscosity.
Tusaale ahaan, heerka polymerization ee hoose -viskosity PDMS (sida 100 mm²/s) badanaa waa mid aad u hooseeya (n waa ku dhawaad dhowr toban). Heerka polymerization ee sare - viscosity PDMS (sida 100,000 mm²/s) waxay noqon kartaa ilaa boqolaal ama xitaa kumanaan.