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01.04.2015 | Original Paper | Ausgabe 2/2015

Cellulose 2/2015

Surface characteristics of cellulose nanoparticles grafted by surface-initiated ring-opening polymerization of ε-caprolactone

Zeitschrift:
Cellulose > Ausgabe 2/2015
Autoren:
Linn Carlsson, Tobias Ingverud, Hanna Blomberg, Anna Carlmark, Per Tomas Larsson, Eva Malmström
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s10570-014-0510-1) contains supplementary material, which is available to authorized users.

Abstract

In this study, surface-initiated ring-opening polymerization has been employed for the grafting of ε-caprolactone from cellulose nanoparticles, made by partial hydrolysis of cellulose cotton linters. A sacrificial initiator was employed during the grafting reactions, to form free polymer in parallel to the grafting reaction. The degree of polymerization of the polymer grafts, and of the free polymer, was varied by varying the reaction time. The aim of this study was to estimate the cellulose nanoparticle degree of surface substitution at different reaction times. This was accomplished by combining measurement results from spectroscopy and chromatography. The prepared cellulose nanoparticles were shown to have 3.1 (±0.3) % of the total anhydroglucose unit content present at the cellulose nanoparticle surfaces. This effectively limits the amount of cellulose that can be targeted by the SI-ROP reactions. For a certain SI-ROP reaction time, it was assumed that the resulting degree of polymerization (DP) of the grafts and the DP of the free polymer were equal. Based on this assumption it was shown that the cellulose nanoparticle surface degree of substitution remained approximately constant (3–7 %) and seemingly independent of SI-ROP reaction time. We believe this work to be an important step towards a deeper understanding of the processes and properties controlling SI-ROP reactions occurring at cellulose surfaces.

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Zusatzmaterial
Supplementary material 1 (PDF 400 kb)
10570_2014_510_MOESM1_ESM.pdf
Literatur
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