We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Controlling Polymer Crystallization Kinetics by Sample History.
- Authors
Poudel, Purushottam; Chandran, Sivasurender; Majumder, Sumit; Reiter, Günter
- Abstract
Abstract: In this paper systematic changes in the isothermal crystallization kinetics (at <italic>T</italic>c = 200 °C) of nonequilibrated isotactic polystyrene films, generated through spin coating are reported. Kinetics is tuned by annealing films at <italic>T</italic>a = 250 °C, i.e., above their nominal melting temperature (<italic>T</italic>mDSC = 220 °C). An exponential decrease in growth rate and a significant decrease of crystal nucleation density by approximately three orders of magnitude are observed by increasing the time (<italic>t</italic>a) provided for equilibration at <italic>T</italic>a. The characteristic exponential decay time is approximately four orders of magnitude longer than the equilibrium reptation time at <italic>T</italic>a. Interestingly, with increasing <italic>t</italic>a, a change in the morphology of lamellar crystals varying from spherulites to hexagons of rather uniform height to finally hexagons exhibiting periodic modulations in height is observed. These observations reveal that understanding and tuning the crystallization kinetics of polymer films under quiescent conditions requires knowledge on how strongly chain conformations deviate from equilibrium.
- Subjects
CRYSTALLINE polymers; CRYSTALLIZATION; CHEMICAL kinetics; POLYSTYRENE; NUCLEATION
- Publication
Macromolecular Chemistry & Physics, 2018, Vol 219, Issue 3, p1
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700315