Reduction of enthalpy relaxation in gelatine films by addition of polyols

Paulo Díaz-Calderón; Bill MacNaughtan; Sandra Hill; John Mitchell; Javier Enrione

doi:10.1016/j.ijbiomac.2017.12.030

Reduction of enthalpy relaxation in gelatine films by addition of polyols

Paulo Díaz-Calderón, Bill MacNaughtan, Sandra Hill, John Mitchell, Javier Enrione^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The aim of this study was to evaluate the effect of plasticisers with different molecular weights (glycerol and sorbitol) on the structural relaxation kinetics of bovine gelatine films stored under the glass transition temperature (Tg). Plasticisers were tested at weight fractions of 0.0, 0.06 and 0.10. Films conditioned in environments under ∼44% relative humidity gave moisture contents (w/w) in the range 0.14–0.18. The enthalpy relaxation (ΔH) was determined using differential scanning calorimetry (DSC). Samples used had Tg values in the range 24–49 °C. After removing the thermal history (30 °C above Tg, 15 min), samples were isothermally stored at 10 °C below Tg for between 2 and 80 h. The addition of plasticisers induced a significant reduction in the rate of structural relaxation. The linearisation of ΔH by plotting against the logarithm of ageing time showed a reduction in the slope of samples plasticised with both polyols. The reduction in relaxation kinetics may be related to the ability of polyols to act as enhancers of molecular packing, as recently reported using positron spectroscopy (PALS). However, a direct correlation between the relaxation kinetics and the plasticiser's molecular weight could not be established, suggesting that this phenomenon may be governed by complex molecular gelatin-plasticiser-water interactions.

Translated title of the contribution	Reducción de la relajación de la entalpía en películas de gelatina mediante la adición de polioles.
Original language	English
Pages (from-to)	634-638
Number of pages	5
Journal	International Journal of Biological Macromolecules
Volume	109
DOIs	https://doi.org/10.1016/j.ijbiomac.2017.12.030
State	Published - 1 Apr 2018

Bibliographical note

Funding Information:
The authors are grateful to Professor Yrjo Ross for his valuable scientific discussions regarding this work . The authors also acknowledge the financial support from the grants FONDECYT N°1171553 and PAI N°79130039 .

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Gelatin
enthalpy relaxation
plasticisers

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10.1016/j.ijbiomac.2017.12.030

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title = "Reduction of enthalpy relaxation in gelatine films by addition of polyols",

abstract = "The aim of this study was to evaluate the effect of plasticisers with different molecular weights (glycerol and sorbitol) on the structural relaxation kinetics of bovine gelatine films stored under the glass transition temperature (Tg). Plasticisers were tested at weight fractions of 0.0, 0.06 and 0.10. Films conditioned in environments under ∼44% relative humidity gave moisture contents (w/w) in the range 0.14–0.18. The enthalpy relaxation (ΔH) was determined using differential scanning calorimetry (DSC). Samples used had Tg values in the range 24–49 °C. After removing the thermal history (30 °C above Tg, 15 min), samples were isothermally stored at 10 °C below Tg for between 2 and 80 h. The addition of plasticisers induced a significant reduction in the rate of structural relaxation. The linearisation of ΔH by plotting against the logarithm of ageing time showed a reduction in the slope of samples plasticised with both polyols. The reduction in relaxation kinetics may be related to the ability of polyols to act as enhancers of molecular packing, as recently reported using positron spectroscopy (PALS). However, a direct correlation between the relaxation kinetics and the plasticiser's molecular weight could not be established, suggesting that this phenomenon may be governed by complex molecular gelatin-plasticiser-water interactions.",

keywords = "Gelatin, enthalpy relaxation, plasticisers, Relajaci{\'o}n de la entalp{\'i}a, Gelatina, Plastificantes",

author = "Paulo D{\'i}az-Calder{\'o}n and Bill MacNaughtan and Sandra Hill and John Mitchell and Javier Enrione",

note = "Funding Information: The authors are grateful to Professor Yrjo Ross for his valuable scientific discussions regarding this work . The authors also acknowledge the financial support from the grants FONDECYT N°1171553 and PAI N°79130039 . Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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doi = "10.1016/j.ijbiomac.2017.12.030",

language = "English",

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T1 - Reduction of enthalpy relaxation in gelatine films by addition of polyols

AU - Díaz-Calderón, Paulo

AU - MacNaughtan, Bill

AU - Hill, Sandra

AU - Mitchell, John

AU - Enrione, Javier

N1 - Funding Information: The authors are grateful to Professor Yrjo Ross for his valuable scientific discussions regarding this work . The authors also acknowledge the financial support from the grants FONDECYT N°1171553 and PAI N°79130039 . Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - The aim of this study was to evaluate the effect of plasticisers with different molecular weights (glycerol and sorbitol) on the structural relaxation kinetics of bovine gelatine films stored under the glass transition temperature (Tg). Plasticisers were tested at weight fractions of 0.0, 0.06 and 0.10. Films conditioned in environments under ∼44% relative humidity gave moisture contents (w/w) in the range 0.14–0.18. The enthalpy relaxation (ΔH) was determined using differential scanning calorimetry (DSC). Samples used had Tg values in the range 24–49 °C. After removing the thermal history (30 °C above Tg, 15 min), samples were isothermally stored at 10 °C below Tg for between 2 and 80 h. The addition of plasticisers induced a significant reduction in the rate of structural relaxation. The linearisation of ΔH by plotting against the logarithm of ageing time showed a reduction in the slope of samples plasticised with both polyols. The reduction in relaxation kinetics may be related to the ability of polyols to act as enhancers of molecular packing, as recently reported using positron spectroscopy (PALS). However, a direct correlation between the relaxation kinetics and the plasticiser's molecular weight could not be established, suggesting that this phenomenon may be governed by complex molecular gelatin-plasticiser-water interactions.

AB - The aim of this study was to evaluate the effect of plasticisers with different molecular weights (glycerol and sorbitol) on the structural relaxation kinetics of bovine gelatine films stored under the glass transition temperature (Tg). Plasticisers were tested at weight fractions of 0.0, 0.06 and 0.10. Films conditioned in environments under ∼44% relative humidity gave moisture contents (w/w) in the range 0.14–0.18. The enthalpy relaxation (ΔH) was determined using differential scanning calorimetry (DSC). Samples used had Tg values in the range 24–49 °C. After removing the thermal history (30 °C above Tg, 15 min), samples were isothermally stored at 10 °C below Tg for between 2 and 80 h. The addition of plasticisers induced a significant reduction in the rate of structural relaxation. The linearisation of ΔH by plotting against the logarithm of ageing time showed a reduction in the slope of samples plasticised with both polyols. The reduction in relaxation kinetics may be related to the ability of polyols to act as enhancers of molecular packing, as recently reported using positron spectroscopy (PALS). However, a direct correlation between the relaxation kinetics and the plasticiser's molecular weight could not be established, suggesting that this phenomenon may be governed by complex molecular gelatin-plasticiser-water interactions.

KW - Gelatin

KW - enthalpy relaxation

KW - plasticisers

KW - Relajación de la entalpía

KW - Gelatina

KW - Plastificantes

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DO - 10.1016/j.ijbiomac.2017.12.030

M3 - Article

C2 - 29258897

AN - SCOPUS:85039754227

SN - 0141-8130

VL - 109

SP - 634

EP - 638

JO - International Journal of Biological Macromolecules

JF - International Journal of Biological Macromolecules

ER -

Reduction of enthalpy relaxation in gelatine films by addition of polyols

Abstract

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Keywords

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