Online citations, reference lists, and bibliographies.
Please confirm you are human
(Sign Up for free to never see this)
← Back to Search

Effects Of Stereo-defect Distribution On The Crystalline Morphology And Tensile Behavior Of Isotactic Polypropylene Prepared By Compression Molding Process

S. Chen, X. Tang, Nannan Duan, L. Wang, H. Wang, J. Kang
Published 2016 · Materials Science

Save to my Library
Download PDF
Analyze on Scholarcy
Share
ABSTRACT In this study, the aggregation morphology, tensile behavior, and morphology evolution during the tensile test of two isotactic polypropylene (iPP) samples with similar molecular weight and average isotacticity but different uniformities of stereo-defect distribution are investigated by differential scanning calorimetry (DSC), two-dimensional wide angle X-ray diffraction (2D-WAXD), and scanning electronic microscopy (SEM). The results revealed that the uniformity of stereo-defect distribution of iPP determines the crystalline structure and aggregation morphology, and further influences the tensile behavior and morphology evolution during the tensile test. For PP-A with less uniform stereo-defect distribution, its ability of crystallization is stronger compared with PP-B, resulting in smaller spherulite sizes, higher melting point and degree of crystallinity, and narrower distribution of lamellar thickness of the compression molding specimens. During the tensile test, mainly the inter-spherulite deformation takes place at the early stage for deformation, which further results in drastic deformation of lamellar and high degree of reorientation at the strain increases, exhibiting higher yield strength and elastic modulus, and lower elongation at break compared with PP-B; for PP-B with more uniform stereo-defect distribution, larger spherulite sizes, lower melting point and degree of crystallinity in its compression molding sample are observed. During the tensile test, intra-spherulite deformation mainly takes place, which can disperse the tensile stress more uniformly. As the strain increases, lower degree of crystalline destruction and reorientation of the crystallites take place. The yield strength and elastic modulus of PP-B is lower than PP-A, and its elongation at break is higher.
This paper references
10.1021/MA0710636
Competition between a, , and ? Polymorphs in a -Nucleated Metallocenic Isotactic Polypropylene
R. Krache (2007)
10.1007/s10965-014-0384-9
Dynamic crystallization and melting behavior of β-nucleated isotactic polypropylene with different melt structures
J. Kang (2014)
10.1039/C4RA03589E
Pore formation mechanism of β nucleated polypropylene stretched membranes
T. Wu (2014)
10.1002/MACP.201300296
Tailoring Mechanical Properties of Isotactic Polypropylene Via Crystallization of the Mesophase and Control of Stereodefects Concentration
C. Rosa (2013)
10.1134/S0965545X14060212
Crystallization behavior, tensile behavior and hydrophilicity of poly(vinylidene fluoride)/poly(vinyl pyrrolidone) blends
J. Zhang (2014)
10.1080/00222348.2014.982481
Investigation on the Self-nucleation Behavior of Controlled-rheology Polypropylene
J. Kang (2015)
10.1007/BF00550300
X-ray diffraction methods in polymer science
L. Alexander (1969)
10.1002/PAT.3210
Investigation on the dynamic crystallization and melting behavior of β‐nucleated isotactic polypropylene with different stereo‐defect distribution—the role of dual‐selective β‐nucleation agent
J. Kang (2014)
10.1016/J.POLYMER.2008.04.033
On the influence of the processing conditions on the performance of electrically conductive carbon nanotube/polymer nanocomposites
N. Grossiord (2008)
10.1016/S0266-3538(98)00124-9
Compression moulding of glass and polypropylene composites for optimised macro- and micro- mechanical properties II. glass-mat-reinforced thermoplastics
M. Wakeman (1999)
10.1002/POL.1979.180170401
High strength elastic polypropylene
R. Samuels (1979)
10.1002/APP.36357
Investigation of the Stereodefect Distribution and Conformational Behavior of Isotactic Polypropylene Polymerized with Different Ziegler-Natta Catalysts
J. Kang (2012)
10.1081/MB-120013089
β-MODIFICATION OF ISOTACTIC POLYPROPYLENE: PREPARATION, STRUCTURE, PROCESSING, PROPERTIES, AND APPLICATION
J. Varga (2002)
10.1007/s10965-014-0506-4
Isothermal crystallization behavior of β-nucleated isotactic polypropylene with different melt structures
J. Kang (2014)
10.1021/CM071502F
Tailoring the Physical Properties of Isotactic Polypropylene through Incorporation of Comonomers and the Precise Control of Stereo- and Regioregularity by Metallocene Catalysts
C. Rosa (2007)
10.1002/PAT.3388
Morphology and mechanical behavior of isotactic polypropylene with different stereo‐defect distribution in injection molding
H. Peng (2014)
10.1002/PEN.760241007
Microstructural aspects of failure in semicrystalline polymers
J. M. Schultz (1984)
10.1016/J.COMPSCITECH.2012.09.017
Injection moulded all-polypropylene composites composed of polypropylene fibre and polypropylene based thermoplastic elastomer
Á. Kmetty (2012)
10.1134/S0965545X13050040
State diagrams of partially crystalline polymer-good solvent systems: The isotactic polypropylene- m -xylene system
L. Mizerovskii (2013)
10.1002/PAT.3416
Effects of β‐nucleating agent and crystallization conditions on the crystallization behavior and polymorphic composition of isotactic polypropylene/multi‐walled carbon nanotubes composites
J. Kang (2015)
10.1016/J.EURPOLYMJ.2005.02.033
Formation of β-crystal from nonisothermal crystallization of compression-molded isotactic polypropylene melt
Y. Shangguan (2005)
10.1007/s00289-013-1077-y
Investigation on the structure and crystallization behavior of controlled-rheology polypropylene with different stereo-defect distribution
J. Kang (2013)
10.1021/JA01611A109
CRYSTALLINE HIGH POLYMERS OF α-OLEFINS
G. Natta (1955)
10.1007/s10965-014-0485-5
Understanding in the morphology and tensile behavior of isotactic polypropylene cast films with different stereo-defect distribution
J. Kang (2014)
10.3144/EXPRESSPOLYMLETT.2010.15
The effect of molecular mass on the polymorphism and crystalline structure of isotactic polypropylene
Z. Horváth (2010)
Polymers for Advanced Technologies, 25:97
J. Kang (2014)
10.1002/APP.10637
Effect of isotacticity distribution on the crystallization and melting behavior of polypropylene
H. Lu (2002)
10.1002/MARC.1997.030180101
On the crystallization of γ-isotactic polypropylene: A high pressure study
S. Brückner (1997)
10.1007/978-94-011-0521-7
Polypropylene : structure, blends and composites
J. Karger-kocsis (1995)
10.1002/APP.38699
Hydrogenated petroleum resin effect on the crystallization of isotactic polypropylene
Jian Kang (2013)
Polymers for Advanced Technologies, 25:353
Z. Chen (2014)
Macromolecular Chemistry and Physics, 214:1951
C. De Rosa (2013)
10.1007/s10965-013-0265-7
Studies on crystallization kinetics, microstructure and mechanical properties of different short carbon fiber reinforced polypropylene (SCF/PP) composites
Syed K. H. Gulrez (2013)
10.1016/0032-3861(86)90147-3
Permanganic etching of PEEK
R. H. Olley (1986)
Polypropylene, Structure, Blends and Composites. Springer-Science Business Media, Germany
J. Karger-Kocsis (1995)
10.1007/s10965-012-0070-8
Dynamic crystallization and melting behavior of β-nucleated isotactic polypropylene polymerized with different Ziegler-Natta catalysts
J. Kang (2013)
10.1177/8756087905057085
Study of Polypropylene Morphology Obtained from Blown and Cast Film Processes: Initial Morphology Requirements for Making Porous Membrane by Stretching
F. Sadeghi (2005)
Polymers for Advanced Technologies, doi:10.1002/pat.3416
J. Kang (2014)
10.1039/C4RA04231J
New understanding in the influence of melt structure and β-nucleating agents on the polymorphic behavior of isotactic polypropylene
J. Kang (2014)
10.1002/PAT.3249
Crystallization behavior and morphology of β‐nucleated isotactic polypropylene with different stereo‐defect distribution
Zhengfang Chen (2014)
10.1016/S0032-3861(97)10160-4
Isotactic polypropylene, β-phase: a study in frustration
D. Dorset (1998)
Polymers for Advanced Technologies, doi:10.1002/pat.3388
H. Peng (2014)
10.1016/S0032-3861(97)10035-0
On row structures, secondary nucleation and continuity in α-polypropylene
H. M. White (1998)
10.1016/S0045-7825(98)00131-5
Analysis and sensitivity analysis for polymer injection and compression molding
D. Smith (1998)
10.1002/APP.30624
Preparation and characterization of polypropylene homocomposites: Exploiting polymorphism of PP homopolymer
J. Karger-Kocsis (2010)
10.1021/MA9804592
Energy Calculations for Isotactic Polypropylene: A Contribution To Clarify the β Crystalline Structure
D. Ferro (1998)
10.1103/PHYSREVLETT.96.167801
A microscopic insight into the deformation behavior of semicrystalline polymers: the role of phase transitions.
C. De Rosa (2006)
10.1016/0079-6700(91)90023-E
Polymorphism in isotactic polypropylene
S. Brückner (1991)
10.1007/s10965-012-9975-5
Isothermal and nonisothermal crystallization of isotactic polypropylene/graphene oxide nanosheet nanocomposites
Jia-Zhuang Xu (2012)
10.1039/C4RA06310D
Influence of lamellar structure on double yield behavior and pore size distribution in β nucleated polypropylene stretched membranes
T. Wu (2014)
10.1016/J.POLYMER.2009.11.018
Effects of ultrasound on the conformation and crystallization behavior of isotactic polypropylene and β-isotactic polypropylene
J. Kang (2010)
10.1016/S0079-6700(00)00046-0
Microstructure of polypropylene
V. Busico (2001)
10.1007/s10965-012-0037-9
Influence of the stereo-defect distribution on the crystallization behavior of Ziegler-Natta isotactic polypropylene
J. Kang (2012)
10.1134/S0965545X14060200
Monte Carlo simulation study of the effect of chain tacticity on demixing of polyethylene/polypropylene blends
Adisak Takhulee (2014)
10.1021/JA045684F
Structure-property correlations in polypropylene from metallocene catalysts: stereodefective, regioregular isotactic polypropylene.
C. De Rosa (2004)
10.1002/APP.40115
Comparative study on the crystallization behavior of β‐isotactic polypropylene nucleated with different β‐nucleation agents —effects of thermal conditions
J. Kang (2014)
10.1016/S0032-3861(97)10208-7
Isotacticity dependence of spherulitic morphology of isotactic polypropylene
K. Yamada (1998)
10.1016/J.EURPOLYMJ.2011.11.023
Polymerization control and fast characterization of the stereo-defect distribution of heterogeneous Ziegler–Natta isotactic polypropylene
J. Kang (2012)
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)
10.1002/APP.38984
Investigation of the crystallization behavior of isotactic polypropylene polymerized with different Ziegler‐Natta catalysts
J. Kang (2013)
10.1134/S0965545X13090071
Effect of montmorillonite treatment with supercritical CO2 on the morphology and properties of polypropylene nanocomposites
L. G. Furlan (2014)
10.1016/J.TCA.2014.11.011
Crystallization and melting behaviors of the β-nucleated isotactic polypropylene with different melt structures – The role of molecular weight
J. Kang (2015)
10.1021/MA051004X
Crystallization Behavior and Mechanical Properties of Regiodefective, Highly Stereoregular Isotactic Polypropylene: Effect of Regiodefects versus Stereodefects and Influence of the Molecular Mass
C. Rosa (2005)



This paper is referenced by
Semantic Scholar Logo Some data provided by SemanticScholar