Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Crystallisation of star polyesters with poly (ε-caprolactone) arms: approaching the problem of early stages in polymer crystallisation
KTH, Superseded Departments, Fibre and Polymer Technology.
2004 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The knowledge regarding early stages in polymer crystallisation remains inconclusive due to experimental limitations. The reason is that the initially formed polymer crystals rearrange rapidly at the crystallisation temperature. Faster experimental techniques or simulation would be suitable alternatives to approach the problem. Another possibility would be to use constrained polymer structures, in which crystal rearrangement would be slower. Star polymers with crystallisable arms may be structures sufficiently constrained to be captured in their early crystallisation stages.

This study reports the crystallisation behaviour of linear poly(c-caprolactone) (PCL) and star polymers based on dendritic cores with grafted PCL arms. Wide angle X-ray scattering proved that the crystal structures of the different polymers were the same. The samples were also studied by differential scanning calorimetry, finding that the star PCL’s had lower crystallinity, lower rate of crystal rearrangement and higher equilibrium melting point than the linear analogues. Polarized optical microscopy showed that the star polymers crystallized slower and had greater tendency to form spherulites and higher fold surface free energy than linear PCL. The single crystal morphology was more irregular in the star polymers as observed by transmission electron microscopy.

These findings confirm the constraining effect of the dendritic cores in the crystallisation of the PCL arms, which retard molecular rearrangement during crystallisation and turn the studied star polymers into excellent candidates to investigate the early stages in polymer crystallisation.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2004. , 53 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2004:39
Keyword [en]
Technology
Keyword [sv]
TEKNIKVETENSKAP
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-327OAI: oai:DiVA.org:kth-327DiVA: diva2:9053
Presentation
2004-12-02, H1, Teknikringen 33, Stockholm, 10:00
Available from: 2004-07-26 Created: 2004-07-26 Last updated: 2012-03-22Bibliographically approved

Open Access in DiVA

fulltext(29667 kB)690 downloads
File information
File name FULLTEXT01.pdfFile size 29667 kBChecksum MD5
af3f02a972af181c5d1743079ddcc0d24a0ce9f2bec3ecd74a0728f146cdcbd65498de0f
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Núñez, Eugenia
By organisation
Fibre and Polymer Technology
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 690 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 527 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf