Thermal analysis of cellulose acetate modified with caprolactone

Gy Számel, Szilvia Klébert, I. Sajó, B. Pukánszky

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Cellulose acetate (CA) was modified with caprolactone (CL) under various reaction conditions in an internal mixer. The thermal behavior and relaxation transitions of the samples were determined by dynamic mechanical analysis and differential scanning calorimetry. Various relaxation transitions were detected in externally and internally modified cellulose acetate by DMTA. These were assigned to the glass transition of the main chain, to the movement of single glucose units and to hydroxymethyl groups. The β transition must belong to structural units larger than a single glucose ring and their formation must depend on sample preparation conditions. No transition could be assigned to grafted polycaprolactone (PCL) chains by DMTA. Contrary to other groups, we could not detect even the transitions of modified CA by DSC. Only the crystallization of oligomeric PCL homopolymer was observed mostly when it diffused to the surface of the sample.

Original languageEnglish
Pages (from-to)715-722
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume91
Issue number3
DOIs
Publication statusPublished - Mar 2008

Fingerprint

cellulose
Thermoanalysis
acetates
Cellulose
Polycaprolactone
thermal analysis
Glucose
Dynamic mechanical analysis
Crystallization
Homopolymerization
glucose
Glass transition
Differential scanning calorimetry
caprolactone
acetylcellulose
heat measurement
crystallization
preparation
scanning
polycaprolactone

Keywords

  • Calorimetry
  • Caprolactone
  • Cellulose acetate
  • Dynamic mechanical analysis
  • Grafting
  • Relaxation transitions

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Thermal analysis of cellulose acetate modified with caprolactone. / Számel, Gy; Klébert, Szilvia; Sajó, I.; Pukánszky, B.

In: Journal of Thermal Analysis and Calorimetry, Vol. 91, No. 3, 03.2008, p. 715-722.

Research output: Contribution to journalArticle

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AB - Cellulose acetate (CA) was modified with caprolactone (CL) under various reaction conditions in an internal mixer. The thermal behavior and relaxation transitions of the samples were determined by dynamic mechanical analysis and differential scanning calorimetry. Various relaxation transitions were detected in externally and internally modified cellulose acetate by DMTA. These were assigned to the glass transition of the main chain, to the movement of single glucose units and to hydroxymethyl groups. The β transition must belong to structural units larger than a single glucose ring and their formation must depend on sample preparation conditions. No transition could be assigned to grafted polycaprolactone (PCL) chains by DMTA. Contrary to other groups, we could not detect even the transitions of modified CA by DSC. Only the crystallization of oligomeric PCL homopolymer was observed mostly when it diffused to the surface of the sample.

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