A study on the characteristics of the adiabatically expanded polyolefin structured foams

Jun Ho Hwang, Woo Nyon Kim, Jae Ho Jun, Soon Jong Kwak, Seung Sang Hwang, Soon Man Hong

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study investigates the isothermal crystallization behaviors of polypropylene-polyethylene-(1-butene) terpolymer and the adiabatically expanded polyolefin structured foams. For this purpose, butane gas was used as a physical blowing agent. Avrami equation has been used to interpret theoretically the experimental results obtained by either DSC or polarized optical microscope. It is believed that elongation induced crystallization occurring during the adiabatic expansion process has resulted in an increase in crystallization rate, eventually leading to a faster growth rate of spherulites and an increase in the nucleation density. An analysis of the foam by SEM images showed that the structure of foam is uniform (below diameter 30 μm, closed cell) In addition, the thermal conductivity and the compressive strength of the polyolefin structured foams was measured. The thermal conductivity of foamed resin with excellent insulation characteristics is reduced compared with unfoamed resin. The compressive strength is decreased with increase in the expansion ratio.

Original languageEnglish
Pages (from-to)605-612
Number of pages8
JournalPolymer (Korea)
Volume29
Issue number6
DOIs
Publication statusPublished - 2005 Nov 1

Keywords

  • Adiabatic expansion
  • Closed cell
  • Crystallization
  • Elongation induced crystallization
  • Thermal conductivity

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

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