Viskositi difrens blong PDMS (polidimetilsiloloxan, we oli save tu olsem dimetil silikon oil) i kamaot from digri blong polimeraesesen, mo tu i gat smol afekt long molekular strakja (olsem kaen grup blong en). Dispela em i wanpela ditel eksplenesen long lukluk bilong kemikel straksa:
Digri bilong polimeraisesen em i as samting i makim viskositi bilong PDMS.
Molekular straksa bilong PDMS i olsem linear sen- olsem, wantaim yunit i save kamap gen em i -Si(CH₃)-O{3}}, na jeneral fomula bilong en i ken kamap olsem: (CH₃)₃}}[Si(Si(Si(Si")₃}[6}[Si (CHi’₃)₃}[Si(Si (CHi(Hi)₃)₃wan bilong yumi). -si (CH₃)₃ we n em i mak bilong polimeraisesen (namba bilong ol yunit i save mekim gen).
Moa mak bilong polimeraisesen (taim n) i antap moa : longpela taim moa bilong ol molekiul sen, moa strong ol van der Waals fos (mainli dispersen fos) namel long ol molekiul, na bikpela mak bilong entanglement namel long ol sen, na dispela i kamapim nogut wara na bikpela viskositi. Moa mak bilong polimeraisesen (taim n i liklik), moa ol molekular sen i sotpela moa, moa ol intermolecular fos i no strong, ol i no pas strong tumas, moa fluiditi, na viskositi i go daun.
Olsem, mak bilong polimeraisesen bilong low-viskositi PDMS (olsem 100 mm2/s) i save stap daunbilo tru (n i klostu sampela ten). Digri bilong polimeraisesen bilong hai-viskositi PDMS (olsem 100,000 mm2/s) inap long go antap inap planti handet o planti tausen tu.