Next Article in Journal
Surface-Engineered Nanocontainers Based on Molecular Self-Assembly and Their Release of Methenamine
Next Article in Special Issue
Effect of Polyhedral Oligomeric Silsesquioxane on the Melting, Structure, and Mechanical Behavior of Polyoxymethylene
Previous Article in Journal
Fluorinated Polymers as Smart Materials for Advanced Biomedical Applications
Previous Article in Special Issue
An Investigation and Comparison of the Blending of LDPE and PP with Different Intrinsic Viscosities of PET
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Polymers 2018, 10(2), 162; https://doi.org/10.3390/polym10020162

Time-Resolving Study of Stress-Induced Transformations of Isotactic Polypropylene through Wide Angle X-ray Scattering Measurements

1
Dipartimento di Scienze Chimiche, Università di Napoli “Federico II”, Complesso Monte Sant’ Angelo, via Cintia, 80126 Napoli, Italy
2
CDRSP—Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Centro Empresarial da Marinha Grande, 2430-028 Marinha Grande, Portugal
*
Author to whom correspondence should be addressed.
Received: 3 January 2018 / Revised: 5 February 2018 / Accepted: 6 February 2018 / Published: 8 February 2018
(This article belongs to the Special Issue Processing-Structure-Properties Relationships in Polymers)
View Full-Text   |   Download PDF [9480 KB, uploaded 8 February 2018]   |  

Abstract

The development of a highly oriented fiber morphology by effect of tensile deformation of stereodefective isotactic polypropylene (iPP) samples, starting from the unoriented γ form, is studied by following the transformation in real time during stretching through wide angle X-ray scattering (WAXS) measurements. In the stretching process, after yielding, the initial γ form transforms into the mesomorphic form of iPP through mechanical melting and re-crystallization. The analysis of the scattering invariant measured in the WAXS region highlights that the size of the mesomorphic domains included in the well oriented fiber morphology obtained at high deformations increases through a process which involves the coalescence of the small fragments formed by effect of tensile stress during lamellar destruction with the domain of higher dimensions. View Full-Text
Keywords: isotactic polypropylene; stress-induced phase transitions; structural analysis; X-ray diffraction isotactic polypropylene; stress-induced phase transitions; structural analysis; X-ray diffraction
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Auriemma, F.; De Rosa, C.; Di Girolamo, R.; Malafronte, A.; Scoti, M.; Mitchell, G.R.; Esposito, S. Time-Resolving Study of Stress-Induced Transformations of Isotactic Polypropylene through Wide Angle X-ray Scattering Measurements. Polymers 2018, 10, 162.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top