Results 11 to 20 of about 6,794,876 (284)
Modeling Flow-Induced Crystallization [PDF]
, 2016 A numerical model is presented that describes all aspects of flow-induced crystallization of isotactic polypropylene at high shear rates and elevated pressures. It incorporates nonlinear viscoelasticity, including viscosity change as a result of formation of oriented fibrillar crystals (shish), compressibility, and nonisothermal process conditions ...
Roozemond, Peter C. +2 more
core +4 more sources
Stress Induced Crystallization in Elongational Flow [PDF]
International Polymer Processing, 2003 Abstract Stress-induced crystallization is studied in an extensional flow device (a cross-slot flow cell) for an isotactic Polypropylene (iPP) by measuring the micro-structure that develops after flow. Birefringence and Wide Angle X-ray experiments were performed.
Swartjes, F.H.M. +3 more
openaire +3 more sources
Flow-Induced Crystallization of Polyamide-6 [PDF]
International Polymer Processing, 2018 Abstract Flow-induced crystallization has been widely studied for a variety of polymers with the main focus on polyolefins. In this work, research has been conducted on the flow-induced crystallization of another important class of polymers, namely polyamides. Different polyamides-6 with varying molecular weight have been studied.
Massaro, Roberta +3 more
openaire +3 more sources
Microrheological Modeling of Flow-Induced Crystallization
Macromolecules, 2001 The problem of flow-induced crystallization (FIC) of polymer melts is addressed via a microrheological approach. In particular, the Doi−Edwards model with the so-called independent alignment approximation (DE−IAA) is used to calculate the flow-induced change of free energy.
COPPOLA, SALVATORE +2 more
openaire +3 more sources
ACS Macro Letters, 2016 The role of an interval of shear flow in promoting the flow-induced crystallization (FIC) for poly(ether ether ketone) PEEK was investigated by melt rheology and calorimetry. At 350 °C, just above the melting temperature of PEEK (Tm), a critical shear rate to initiate the formation of flow-induced precursors was found to coincide with the shear rate at
Behzad, Nazari +3 more
openaire +3 more sources
Flow-induced crystallization of polylactides in capillary flow
, 2021 Polylactide (PLA) is a biodegradable thermoplastic polyester produced from renewable biomass sources. The low crystallinity and the low associated crystallization kinetics have a negative impact on its mechanical and barrier properties. In this Master thesis, the effect of flow on the PLA crystallization is studied.
Zhang, Ziyue
core +3 more sources
Comparison of Flow-induced Crystallization Melt Spinning Processes
Ruhuna Journal of Science, 2008 The melt spinning process for artificial fibers has been studied by many research groups throughout the world during the last four decades. However, comparison of flow-induced crystallization melt spinning processes has not yet been treated in the ...
S.S.N. Perera
doaj +1 more source
Pressure Quench of Flow-Induced Crystallization Precursors
Macromolecules, 2012 We developed a novel protocol to study the mutual influence of shear flow and pressure on crystallization of polymers. Here, we have applied this protocol, named "pressure quench", to polyethylene with a bimodal molecular weight distribution. With pressure quench, the undercooling, required to initiate crystallization of flow-induced precursors ...
Ma, Z., Balzano, L., Peters, G.W.M.
openaire +2 more sources
Extensional-flow-induced Crystallization of Polypropylene [PDF]
, 2011 A filament stretching extensional rheometer was used to investigate the effect of uniaxial flow on the crystallization of polypropylene. Samples were heated to a temperature above the melt temperature to erase their thermal and mechanical histories. The Janeschitz-Kriegl protocol was applied and samples were stretched at various extension rates to a ...
Bischoff White, Erica E
openaire +3 more sources
Flow-Induced Crystallization in Polymer Processing
, 2007 The paper first presents the experimental set-ups designed to produce flow-induced crystallization and the techniques used to analyze structure development. Then, the general effects of flow are discussed in terms of crystallization thermodynamics (nucleation, growth, overall kinetics), with the consequences on morphologies (from spherulites to shish ...
Haudin, Jean-Marc, Jean-Marc Haudin
openaire +4 more sources