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Gutzow, I.; Rüssel, Christian; Durschang, B

doi:10.1023/a:1018635415674

Cited by 20 publications

(9 citation statements)

References 16 publications

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“…3. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][25][26][27][28][29][33][34][35] However, in our case, it is a phase-separated blend with crystallizable iPP rich phases separated or partitioned by noncrystallizable PEOc rich phases. We call these structures cylindrites and sometimes shish kebabs just for convenience.…”

Section: B Shish-kebab Structuresmentioning

confidence: 99%

Shear-induced crystallization in phase-separated blend of isotactic polypropylene and poly (ethylene-co-octene)

Meng

Dong

Hong

et al. 2008

The Journal of Chemical Physics

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Isothermal crystallization after shear in a blend of isotactic polypropylene (iPP) and poly (ethylene-co-octene) (PEOc) was investigated by in situ optical microscopy and shear hot stage under various thermal and shear histories. Crystalline cylindrites during growth were observed in phase-separated iPPPEOc blends for the first time. According to our results, the very long cylindrites are formed which are much longer than the dimensions of the liquid-liquid phase-separated domains under shear, and the cylindrites appear to grow through noncrystallizable domains, as well as through crystallizable ones. Obviously, the nuclei ("shish") come from the oriented and entangled network strands instead of pulled-out long chains. The number of cylindrites and the distortion and breakup of the cylindrites are related to the shear rate and shear time. On the other hand, the number of spherulites increases not only with shear rate but also with liquid-liquid phase separation time. Spherulites always form with longer induction time than cylindrites due to the different nucleation mechanism. The shish is nucleated through the shear-induced mechanism, and most of the spherulites are nucleated through liquid-liquid spinodal decomposition and crossover after the cessation of shear. During the process of experiments, we also found three kinds of shish-kebab structures, which provide further physical insights into the mechanism of the shish formation in polymer blend after liquid-liquid phase separation under shear.

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Section: B Shish-kebab Structuresmentioning

confidence: 99%

Shear-induced crystallization in phase-separated blend of isotactic polypropylene and poly (ethylene-co-octene)

Meng

Dong

Hong

et al. 2008

The Journal of Chemical Physics

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“…On the other hand, there are indications (see Refs. [15][16][17][18][19][20] ) that the time-scales of structural relaxation and of ordering in glassy systems becomes shorter, when we move over equilibrium phase diagram to the range of more higher pressures.…”

Section: Introductionmentioning

confidence: 99%

Scaling law for crystal nucleation time in glasses

Мокшин

Galimzyanov

2015

The Journal of Chemical Physics

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Due to high viscosity, glassy systems evolve slowly to the ordered state. Results of molecular dynamics simulation reveal that the structural ordering in glasses becomes observable over "experimental" (finite) time-scale for the range of phase diagram with high values of pressure. We show that the structural ordering in glasses at such conditions is initiated through the nucleation mechanism, and the mechanism spreads to the states at extremely deep levels of supercooling. We find that the scaled values of the nucleation time, τ 1 (average waiting time of the first nucleus with the critical size), in glassy systems as a function of the reduced temperature, T , are collapsed onto a single line reproducible by the power-law dependence. This scaling is supported by the simulation results for the model glassy systems for a wide range of temperatures as well as by the experimental data for the stoichiometric glasses at the temperatures near the glass transition.

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“…Even in mildly confined conditions, inorganic melts may exhibit several peculiarities. These include positive [5] or negative [6,7] dependence of viscosity on pressure, pressure-induced structural changes [8], the evolution of anisotropic flow and structural rearrangement [9,10], crystallization [11,12] and solubility of gases [13,14]. Compared to organic fluids (and particularly polymer melts), for reasons of experimental limitations, these phenomena are typically difficult to assess.…”

Section: Introductionmentioning

confidence: 99%