Next Article in Journal
Cellular Anti-Melanogenic Effects of a Euryale ferox Seed Extract Ethyl Acetate Fraction via the Lysosomal Degradation Machinery
Previous Article in Journal
Proteomic Insights into Sulfur Metabolism in the Hydrogen-Producing Hyperthermophilic Archaeon Thermococcus onnurineus NA1
Article Menu
Issue 5 (May) cover image

Export Article

Open AccessArticle
Int. J. Mol. Sci. 2015, 16(5), 9196-9216; doi:10.3390/ijms16059196

A Polymer Visualization System with Accurate Heating and Cooling Control and High-Speed Imaging

1
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8, Canada
2
National Engineering Research Center of Novel Equipment for Polymer Processing, the Key Laboratory of Polymer Processing Engineering, Ministry of Education of China, South China University of Technology, Guangzhou 510641, China
*
Author to whom correspondence should be addressed.
Academic Editor: Iolanda Francolini
Received: 16 March 2015 / Revised: 10 April 2015 / Accepted: 14 April 2015 / Published: 23 April 2015
(This article belongs to the Section Biomaterial Sciences)
View Full-Text   |   Download PDF [5568 KB, uploaded 23 April 2015]   |  

Abstract

A visualization system to observe crystal and bubble formation in polymers under high temperature and pressure has been developed. Using this system, polymer can be subjected to a programmable thermal treatment to simulate the process in high pressure differential scanning calorimetry (HPDSC). With a high-temperature/high-pressure view-cell unit, this system enables in situ observation of crystal formation in semi-crystalline polymers to complement thermal analyses with HPDSC. The high-speed recording capability of the camera not only allows detailed recording of crystal formation, it also enables in situ capture of plastic foaming processes with a high temporal resolution. To demonstrate the system’s capability, crystal formation and foaming processes of polypropylene/carbon dioxide systems were examined. It was observed that crystals nucleated and grew into spherulites, and they grew at faster rates as temperature decreased. This observation agrees with the crystallinity measurement obtained with the HPDSC. Cell nucleation first occurred at crystals’ boundaries due to CO2 exclusion from crystal growth fronts. Subsequently, cells were nucleated around the existing ones due to tensile stresses generated in the constrained amorphous regions between networks of crystals. View Full-Text
Keywords: foam; polypropylene; crystallization; high-pressure differential scanning calorimetry; foaming visualization foam; polypropylene; crystallization; high-pressure differential scanning calorimetry; foaming visualization
Figures

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 alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Wong, A.; Guo, Y.; Park, C.B.; Zhou, N.Q. A Polymer Visualization System with Accurate Heating and Cooling Control and High-Speed Imaging. Int. J. Mol. Sci. 2015, 16, 9196-9216.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top