scholarly journals Fundamental studies on shear-induced nucleation and beta-phase formation in the isotactic polypropylene—effect of the temperature

2021 ◽  
Vol 28 (11) ◽  
Author(s):  
W. H. Bednarek ◽  
D. Paukszta ◽  
M. Szostak ◽  
J. Szymańska
Keyword(s):  
Phase Formation ◽  
Beta Phase ◽  
Secondary Nucleation ◽  
Β Phase ◽  
Primary Nucleation ◽  
Temperature Regimes ◽  
Crystallization Of Polymers ◽  
Induced Crystallization ◽  
Key Parameter

AbstractThe complex and incompletely understood phenomenon of shear-induced crystallization of polymers may be nowadays analysed via the in situ POM-shear stage methodology. In this research, the two main issues were investigated with the use of the Linkam CCS450 shear stage connected with POM microscope. It was found that the secondary nucleation in the tree well-known temperature regimes plays the greater role in the overall crystallization kinetics than the shear induced primary nucleation. Furthermore, it was found that the tendency towards β-phase formation in shear conditions is dependent on the temperature value during shear treatment. It may be concluded that the temperature is the key parameter in the primary and secondary nucleation process and beta-phase formation in the iPP melts.

scholarly journals In-situ time-of-flight neutron diffraction of ErD2 (beta phase) formation during D2 loading.

2008 ◽  
Author(s):  
James Frederick Browning ◽  
Anna Llobet ◽  
Clark Sheldon Snow ◽  
Mark Andrew Rodriguez ◽  
Ryan R. Wixom
Keyword(s):  
Neutron Diffraction ◽  
Phase Formation ◽  
Time Of Flight ◽  
Beta Phase

Understanding the phase formation kinetics of nano-crystalline kesterite deposited on mesoscopic scaffolds via in situ multi-wavelength Raman-monitored annealing

2016 ◽  
Vol 18 (42) ◽  
pp. 29435-29446 ◽  
Author(s):  
Zhuoran Wang ◽  
Samir Elouatik ◽  
George P. Demopoulos
Keyword(s):  
Real Time ◽  
Phase Formation ◽  
Formation Kinetics ◽  
Nano Crystalline ◽  
Multi Wavelength ◽  
Real Time Information ◽  
Kinetics Of ◽  
Time Information ◽  
Annealing Method

The in situ Raman monitored annealing method is developed in this work to provide real-time information on phase formation and crystallinity evolution of kesterite deposited on a TiO2 mesoscopic scaffold.

In-situ He+ irradiation induced crystallization on crystalline/amorphous ZrC films

2021 ◽  
pp. 102580
Author(s):  
Shengming Jiang ◽  
Ruihua Zhu ◽  
Ming Chen ◽  
Huanhuan He ◽  
Zhiwei Lin ◽  
...  
Keyword(s):  
Induced Crystallization

scholarly journals Phase Formation during Solidification of Mg-Nd-Zn Alloys: An In Situ Synchrotron Radiation Diffraction Study

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1637 ◽  
Author(s):  
Domonkos Tolnai ◽  
Tungky Subroto ◽  
Serge Gavras ◽  
Ricardo Buzolin ◽  
Andreas Stark ◽  
...  
Keyword(s):  
Rare Earth ◽  
Synchrotron Radiation ◽  
Diffraction Study ◽  
Phase Formation ◽  
Theoretical Calculations ◽  
Alloy System ◽  
Zn Addition ◽  
Synchrotron Radiation Diffraction ◽  
Zn Alloys

Mg-4Nd base alloys with Zn additions of 3, 5 and 8 wt % were investigated with in situ synchrotron radiation diffraction during solidification. This method enabled the investigation of phase formation and transformation in the alloys. The diffraction results were supported with TEM observations on the as-solidified samples. The results show the effect of increased Zn addition on stabilizing the Mg3RE phase (RE—rare earth). The experimental results agree only partially with the theoretical calculations indicating the need to improve the existing thermodynamic database on the alloy system.

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