Elongation-induced crystallization of a high molecular weight isotactic polybutene-1 melt compared to shear-induced crystallization

Flow-enhanced nucleation of poly(1-butene): Model application to short-term and continuous shear and extensional flow

“…Calculations are compared with results from continuous flow experiments from various sources [Acierno et al (2008); Hadinata et al (2007Hadinata et al ( , 2005]. In these types of experiments, the polymer melt is subjected to a constant shear or extension rate in a rheometer while the viscosity is monitored.…”

“…The time at which this happens is a measure for the crystallizationenhancing effect of flow. These types of experiments have been performed in rotational flow [Acierno et al (2008); Hadinata et al (2005)] as well as extensional flow [Derakhshandeh and Hatzikiriakos (2012); Hadinata et al (2007); White et al (2012)]. Flow times are typically higher than for short-term flow experiments, which at high-shear rates might result in destruction of the sample.…”

“…Parameters for the nucleation model are first determined from fitting to short-term shear experiments [Ottonello (2003)]. Then, using the same parameters, the model is validated in continuous simple shear and uniaxial extension flow [Acierno et al (2008); Hadinata et al (2007Hadinata et al ( , 2005]. The Schneider rate equations [Schneider et al (1988)] and a suspension model [Roozemond et al (2012); Steenbakkers and Peters (2008)] are used to calculate crystalline volume fraction and resulting viscosity increase in time.…”

Modeling Flow-Induced Crystallization

“…Using this protocol, flow-induced point-like nucleation (appearing for low to mild flow rates) has been thoroughly characterized, using a shear cell combined with optical microscopy, for iPP [19][20][21][22][23][24][25][26][27][28], isotactic poly(1-butene) [29][30][31], and poly(lactic acid) [32]. Alternatively, a rheometer can be used to apply flow and monitor subsequent crystallization in terms of rheology [32][33][34][35][36][37][38]. Using a model for the crystallinity dependence of rheological properties [39,40], it is even possible to extract nucleation density from rheological data [25,35].…”

Flow-induced crystallization studied in the RheoDSC device: Quantifying the importance of edge effects

“…Such studies have been performed on, for example, isotactic polypropylene (iPP) (Housmans et al 2009;Ma et al 2011;Lamberti et al 2007;Vleeshouwers and Meijer 1996), polyethylene (PE) (Carrot et al 1993;Derakhshandeh and Hatzikiriakos 2012), isotactic poly(1-butene) (iP1B) (Acierno et al 2008;Hadinata et al 2007;Hadinata et al 2005;Roozemond and Peters 2013), and poly(lactic acid) (PLA) (Fang et al 2013), either using the short-term shear protocol (Liedauer et al 1993), cf. refs.…”