Influence of elasticity on dispersed-phase droplet size in immiscible polymer blends in simple shearing flow

2002 ◽  
Vol 42 (4) ◽  
pp. 798-809 ◽  
Author(s):  
Wanchai Lerdwijitjarud ◽  
Anuvat Sirivat ◽  
Ronald G. Larson
Keyword(s):  
Polymer Blends ◽  
Droplet Size ◽  
Dispersed Phase ◽  
Simple Shearing ◽  
Immiscible Polymer Blends ◽  
Shearing Flow ◽  
Immiscible Polymer

Coalescence during annealing of quiescent immiscible polymer blends

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Bojan Dimzoski ◽  
Ivan Fortelný ◽  
Miroslav Šlouf ◽  
Martina Nevoralová ◽  
Danuše Michálková ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Complex Viscosity ◽  
Dispersed Phase ◽  
Approximate Theory ◽  
Immiscible Polymer Blends ◽  
Low Frequencies ◽  
Droplet Shape ◽  
Immiscible Polymer ◽  
The Matrix ◽  
Spherical Droplets

AbstractCoalescence during annealing of quiescent immiscible polymer blends, containing polypropylene (PP) matrix and different amount of ethylene-propylene copolymer (EPR) as dispersed phase, was studied. Comparison of experimental results with available coalescence theories revealed that changes in the phase structure after 20 min annealing can be precisely estimated using the approximate theory of coalescence induced by van der Waals forces and considering drainage of the matrix film between spherical droplets. All results evidenced growth of the EPR droplet size with the annealing time and temperature; increase in the content of dispersed phase contributed to higher growth rate of the dispersed phase, more pronounced at the coalescence origin. Anisometry of the EPR droplets and droplet shape relaxation were perceived, both interfering the course of coalescence. Enhanced elasticity of examined blends at low frequencies and positive deviation of the complex viscosity from the linear mixing rules was observed.

scholarly journals Description of the Droplet Size Evolution in Flowing Immiscible Polymer Blends

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 761 ◽  
Author(s):  
Fortelný ◽  
Jůza
Keyword(s):  
Polymer Blends ◽  
Droplet Size ◽  
Phase Structure ◽  
Droplet Breakup ◽  
Structure Evolution ◽  
Immiscible Polymer Blends ◽  
Collision Efficiency ◽  
Immiscible Polymer ◽  
Size Evolution ◽  
Analytic Expressions

Control of the phase structure evolution in flowing immiscible polymer blends during their mixing and processing is fundamental for tailoring of their performance. This review summarizes present state of understanding and predictability of the phase structure evolution in flowing immiscible polymer blends with dispersed structure. Results of the studies of the droplet breakup in flow, important for determination of the droplet breakup frequency and of the size distribution of the daughter droplets, are reviewed. Theories of the flow-induced coalescence providing equations for collision efficiency are discussed. Approximate analytic expressions reliably describing dependence of the collision efficiency on system parameters are presented. Available theories describing the competition between the droplet breakup and coalescence in flow are summarized and approximations used in their derivation are discussed. Problems with applicability of available theories on prediction of the droplet size evolution during mixing and processing of immiscible polymer blends, which have not been broadly discussed so far, are addressed.

Morphology evolution during cooling of quiescent immiscible polymer blends: matrix crystallization effect on the dispersed phase coalescence

2012 ◽  
Vol 70 (1) ◽  
pp. 263-275 ◽  
Author(s):  
Bojan Dimzoski ◽  
Ivan Fortelný ◽  
Miroslav Šlouf ◽  
Antonín Sikora ◽  
Danuše Michálková
Keyword(s):  
Polymer Blends ◽  
Dispersed Phase ◽  
Morphology Evolution ◽  
Immiscible Polymer Blends ◽  
Immiscible Polymer ◽  
Crystallization Effect

Temporary droplet-size hysteresis in immiscible polymer blends

Polymer ◽  
2000 ◽  
Vol 41 (16) ◽  
pp. 6263-6270 ◽  
Author(s):  
A.J Ramic ◽  
S.D Hudson ◽  
A.M Jamieson ◽  
I Manas-Zloczower
Keyword(s):  
Polymer Blends ◽  
Droplet Size ◽  
Immiscible Polymer Blends ◽  
Immiscible Polymer

Dispersed Phase Deformation Modeling of Immiscible Polymer Blends in Injection Molding

2015 ◽  
Vol 34 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yi Zhang ◽  
Fen Liu ◽  
Zhigao Huang ◽  
Xiaolin Xie ◽  
Bin Shan ◽  
...  
Keyword(s):  
Injection Molding ◽  
Polymer Blends ◽  
Dispersed Phase ◽  
Immiscible Polymer Blends ◽  
Phase Deformation ◽  
Immiscible Polymer
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