The role of phonon focussing and structure scattering in oriented semicrystalline polymers

1989 ◽  
Vol 77 (2) ◽  
pp. 219-228 ◽  
Author(s):  
M. Pietralla ◽  
R. M. Weeger ◽  
D. B. Mergenthaler
Keyword(s):  
Semicrystalline Polymers ◽  
Phonon Focussing

scholarly journals Competition between crystal growth and intracrystalline chain diffusion determines the lamellar thickness in semicrystalline polymers

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Martha Schulz ◽  
Mareen Schäfer ◽  
Kay Saalwächter ◽  
Thomas Thurn-Albrecht
Keyword(s):  
Decisive Role ◽  
Semicrystalline Polymers ◽  
Lamellar Thickness ◽  
Polarization Microscopy ◽  
Polymer Systems ◽  
X Ray Scattering ◽  
Special Cases ◽  
Lamellar Crystals ◽  
Nmr Methods

AbstractThe non-equilibrium thickness of lamellar crystals in semicrystalline polymers varies significantly between different polymer systems and depends on the crystallization temperature Tc. There is currently no consensus on the mechanism of thickness selection. Previous work has highlighted the decisive role of intracrystalline chain diffusion (ICD) in special cases, but a systematic dependence of lamellar thickness on relevant timescales such as that of ICD and stem attachment has not yet been established. Studying the morphology by small-angle X-ray scattering and the two timescales by NMR methods and polarization microscopy respectively, we here present data on poly(oxymethylene), a case with relatively slow ICD. It fills the gap between previously studied cases of absent and fast ICD, enabling us to establish a quantitative dependence of lamellar thickness on the competition between the noted timescales.

Role of coupling microscopic and macroscopic phenomena during the crystallization of semicrystalline polymers

2001 ◽  
Vol 41 (11) ◽  
pp. 1871-1885 ◽  
Author(s):  
N. Prabiiu ◽  
J. Schultz ◽  
S. G. Advani ◽  
K. I. Jacob
Keyword(s):  
Semicrystalline Polymers

The role of dislocations for the plastic deformation of semicrystalline polymers as investigated by multireflection X-ray line profile analysis

2012 ◽  
Vol 125 (6) ◽  
pp. 4150-4154 ◽  
Author(s):  
Florian Spieckermann ◽  
Gerald Polt ◽  
Harald Wilhelm ◽  
Michael Kerber ◽  
Erhard Schafler ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Line Profile ◽  
Profile Analysis ◽  
Semicrystalline Polymers ◽  
Line Profile Analysis ◽  
X Ray

Role of the Intercrystalline Tie Chains Network in the Mechanical Response of Semicrystalline Polymers

2017 ◽  
Vol 118 (21) ◽  
Author(s):  
Sara Jabbari-Farouji ◽  
Olivier Lame ◽  
Michel Perez ◽  
Joerg Rottler ◽  
Jean-Louis Barrat
Keyword(s):  
Mechanical Response ◽  
Semicrystalline Polymers

Role of the Interfacial Orientation in Adhesion between Semicrystalline Polymers

2001 ◽  
Vol 34 (9) ◽  
pp. 2932-2936 ◽  
Author(s):  
C. Laurens ◽  
R. Ober ◽  
C. Creton ◽  
L. Léger
Keyword(s):  
Semicrystalline Polymers

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

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