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The Influence Of Crystallization Conditions On The Macromolecular Structure And Strength Of γ-polypropylene

C. V. Baeckmann, H. Wilhelm, F. Spieckermann, S. Strobel, Gerald Polt, P. Sowinski, E. Piórkowska, A. Bismarck, M. Zehetbauer
Published 2019 · Materials Science

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Abstract The influence of the crystallization temperature and the pressure on the crystallization kinetics, structure and compression strength of γ-polypropylene was investigated. Samples were produced in a custom-made high-pressure crystallization cell and characterized by differential scanning calorimetry (DSC), wide angle X-ray scattering (WAXS) and transmission electron microscopy (TEM). It could be shown that the strength is mainly affected by the mean lamellar thickness. The strength of γ-PP is at least 40% higher than α-PP at the same mean lamellar thickness. This confirms the hypothesis that the arrangement of non-parallel chains restricts the number of possible slip systems so that almost no mobile dislocations are generated. The mode of nucleation is only slightly affected by the crystallization pressure. The Avrami coefficient is n = 2.5 ± 0.1 at the beginning of crystallization and largely independent of pressure.
This paper references
10.1016/0032-3861(61)90021-0
Polymorphism of crystalline polypropylene
E. J. Addink (1961)
10.1016/J.PROGPOLYMSCI.2003.09.003
Strength and toughness of crystalline polymer systems
A. Gałęski (2003)
10.1016/J.EURPOLYMJ.2016.10.055
Nucleation of crystallization of isotactic polypropylene in the gamma form under high pressure in nonisothermal conditions
P. Sowiński (2016)
10.1021/MA951168L
α-γ disorder in isotactic polypropylene crystallized under high pressure
S. V. Meille (1996)
10.1103/PHYSREVLETT.91.095502
Role of the entangled amorphous network in tensile deformation of semicrystalline polymers.
Yongfeng Men (2003)
10.1021/MA981849R
Structural and Kinetic Factors Governing the Formation of the γ Polymorph of Isotactic Polypropylene
R. Alamo (1999)
10.1016/S0032-3861(97)00071-2
Kinetic of crystallization from the melt and chain folding in polyethylene fractions revisited: theory and experiment
J. Hoffman (1997)
10.1016/0032-3861(93)90002-R
The gamma phase of high-molecular-weight polypropylene: 1. Morphological aspects
R. Campbell (1993)
10.1021/MA0708038
Plastic deformation of the γ phase isotactic polypropylene in plane-strain compression at elevated temperatures
E. Lezak (2007)
10.1016/S0032-3861(97)00131-6
The γ-phase of high molecular weight isotactic polypropylene. II: The morphology of the γ-form crystallized at 200 MPa
K. Mezghani (1997)
10.1002/(SICI)1099-0488(19991101)37:21<3131::AID-POLB22>3.0.CO;2-M
Crystal thickness distributions from melting homopolymers or random copolymers
B. Crist (1999)
10.1016/J.MECHMAT.2013.05.010
The role of dislocations in γ-iPP under plastic deformation investigated by X-ray line profile analysis
Gerald Polt (2013)
10.1016/0032-3861(71)90031-0
Development of the γ-crystal form in random copolymers of propylene and their analysis by dsc and x-ray methods
A. Turner‐Jones (1971)
10.1002/POLB.1990.090280410
Mechanical spectrometry of alpha relaxations of high‐density polyethylene
N. Albérola (1990)
10.3139/9783446430129.001
Part I Polymers: Nano- and Micromechanics of Crystalline Polymers
A. Gałęski (2009)
10.1021/ACS.MACROMOL.7B00931
Dislocation Movement Induced by Molecular Relaxations in Isotactic Polypropylene
F. Spieckermann (2017)
10.1002/9781118541838
Handbook of polymer crystallization
E. Piórkowska (2013)
10.1016/J.POLYMER.2017.05.011
Critical stress and thermal activation of crystal plasticity in polyethylene: Influence of crystal microstructure and chain topology
Bijin Xiong (2017)
10.1016/J.EURPOLYMJ.2016.08.002
Crystallization kinetics of polymer fibrous nanocomposites
S. Galeski (2016)
10.1021/MA900475H
Epitaxially Dominated Crystalline Morphologies of the γ-Phase in Isotactic Polypropylene
Y. Cao (2009)
10.1016/0032-3861(91)90185-L
Single crystals of γ phase isotactic polypropylene: combined diffraction and morphological support for a structure with non-parallel chains
B. Lotz (1991)
10.1021/MA951885F
On the γ-Phase of Isotactic Polypropylene
R. Thomann (1996)
10.1063/1.1707973
Thermal Initiation of Screw Dislocations in Polymer Crystal Platelets
James M. Peterson (1966)
10.1016/J.POLYMER.2014.01.020
Rate mechanism and dislocation generation in high density polyethylene and other semicrystalline polymers
F. Spieckermann (2014)
10.1016/J.MSEA.2004.03.099
Evidence of dislocations in melt-crystallised and plastically deformed polypropylene
H. Wilhelm (2004)
10.1002/MASY.201050807
Plasticity of Semicrystalline Polymers
Z. Bartczak (2010)
10.1016/J.POLYMER.2005.06.126
Rate mechanisms of plasticity in semi-crystalline polyethylene
A. S. Argon (2005)
10.1002/9781118541838.CH7
Overall Crystallization Kinetics
E. Piórkowska (2013)
10.1016/J.PROGPOLYMSCI.2006.05.001
Critical assessment of overall crystallization kinetics theories and predictions
E. Piórkowska (2006)
10.1016/J.IJPLAS.2019.01.010
Characterization of strain bursts in high density polyethylene by means of a novel nano creep test
H. Wilhelm (2019)
10.1016/S0032-3861(97)10121-5
The γ-phase of high molecular weight isotactic polypropylene: III. The equilibrium melting point and the phase diagram
K. Mezghani (1998)
10.1016/J.POLYMER.2009.02.050
Structure-property relations in molded, nucleated isotactic polypropylene
Jw Jan-Willem Housmans (2009)
10.1021/MA8014992
Pressure Dependence of the Glass Transition in Atactic and Isotactic Polypropylene
A. Gitsas (2008)
10.1021/MA0605907
Plastic Deformation of the γ Phase in Isotactic Polypropylene in Plane-Strain Compression
E. Lezak (2006)
10.1021/JA045684F
Structure-property correlations in polypropylene from metallocene catalysts: stereodefective, regioregular isotactic polypropylene.
C. De Rosa (2004)
10.1007/978-94-011-0523-1_4
Microstructural aspects of fracture in polypropylene and in its filled, chopped fiber and fiber mat reinforced composites
J. Karger-kocsis (1995)
10.1002/MARC.1997.030180101
On the crystallization of γ-isotactic polypropylene: A high pressure study
S. Brückner (1997)
10.1021/MA020648R
Crystallization of Metallocene-Made Isotactic Polypropylene: Disordered Modifications Intermediate between the α and γ Forms
F. Auriemma (2002)
10.1103/PHYSREV.79.722
Multiplication Processes for Slow Moving Dislocations
F. Frank (1950)
10.1016/J.EURPOLYMJ.2013.01.015
Crystallization of isotactic polypropylene containing beta-phase nucleating agent at rapid cooling
Ayret Mollova (2013)
10.1021/MA030157M
Formation of the α and γ polymorphs in random metallocene-propylene copolymers. Effect of concentration and type of comonomer
Ian L. Hosier (2003)
10.1021/MA991813E
Crystallization of Isotactic Polypropylene under High Pressure (γ Phase)
C. Angelloz (2000)
10.1021/MA00194A035
Mechanical properties of model polyethylenes: tensile elastic modulus and yield stress
B. Crist (1989)
10.1021/MA070409+
Crystallization Behavior of Isotactic Propylene−Ethylene and Propylene−Butene Copolymers: Effect of Comonomers versus Stereodefects on Crystallization Properties of Isotactic Polypropylene
C. Rosa (2007)
10.1063/1.1655887
Peierls Stress for Screw Dislocations in Polyethylene
James M. Peterson (1968)
10.1007/BF00274564
The role of dislocations in the yield of polypropylene
W. O'kane (1995)
10.1016/J.POLYMER.2012.09.053
Structure, mechanical properties and modelling of polypropylene for different degrees of crystallinity
T. Parenteau (2012)
10.1080/14786439808206535
A dislocation model for yield in polyethylene
R. Young (1974)
10.1021/MA035295Q
Comparison between Polymorphic Behaviors of Ziegler−Natta and Metallocene-Made Isotactic Polypropylene: The Role of the Distribution of Defects in the Polymer Chains
C. Rosa (2004)
10.3144/EXPRESSPOLYMLETT.2015.81
Crystalline plasticity in isotactic polypropylene below and above the glass transition temperature
Gerald Polt (2015)
10.1021/MA00134A058
REGIME III CRYSTALLIZATION IN POLYPROPYLENE
E. J. Clark (1984)
10.1081/MB-120013089
β-MODIFICATION OF ISOTACTIC POLYPROPYLENE: PREPARATION, STRUCTURE, PROCESSING, PROPERTIES, AND APPLICATION
J. Varga (2002)
10.1016/J.POLYMER.2005.06.073
Plastic deformation of polyethylene crystals as a function of crystal thickness and compression rate
T. Kaźmierczak (2005)
10.1016/J.POLYMER.2018.07.056
On the structure and nucleation mechanism in nucleated isotactic polypropylene crystallized under high pressure
P. Sowiński (2018)



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