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- W2058016091 abstract "In this work the kinetics of the isothermal crystallization from the melt of isotactic polyolefins in quiescent conditions as well as after the application of a step-shear flow is investigated by means of rheological measurements. It is shown that the kinetics of the crystallization, as measured by the increase of the storage modulus, is not affected by the strain amplitude and the frequency of the oscillation, once they are properly chosen. A strong enhancement of the crystallization kinetics has been obtained when the step-shear flow was applied at the crystallization temperature TC=92°C for two different molecular weight poly(1-butene) samples (i-PB400 and i-PB200) and at TC=137°C for a polypropylene (i-PP). In particular, the overall-crystallization rate constants of the i-PB400 increased with increasing the applied shear rate at a constant total strain of 60. At higher shear flow temperatures slower kinetics occurred in all the cases until the effect of the applied shear flow was lost. Moreover, the effect of the molecular weight on the flow induced crystallization phenomenon is investigated on the two i-PB samples and the results have clearly shown that the higher molecular weight i-PB200 polymer is much more sensitive than the i-PB400 to the flow history." @default.
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- W2058016091 date "2002-03-01" @default.
- W2058016091 modified "2023-10-14" @default.
- W2058016091 title "Shear flow effects on polymer melts crystallization: kinetics features" @default.
- W2058016091 doi "https://doi.org/10.1002/1521-3900(200203)180:1<169::aid-masy169>3.0.co;2-a" @default.
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