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Establishing whether the structural feature controlling the mechanical properties of starch films is molecular or crystalline
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Li, Ming, Xie, Fengwei, Hasjim, Jovin, Witt, Torsten, Halley, Peter J. and Gilbert, Robert G. (2015) Establishing whether the structural feature controlling the mechanical properties of starch films is molecular or crystalline. Carbohydrate Polymers, 117 . pp. 262-270. doi:10.1016/j.carbpol.2014.09.036 ISSN 0144-8617.
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Official URL: http://dx.doi.org/10.1016/j.carbpol.2014.09.036
Abstract
The effects of molecular and crystalline structures on the tensile mechanical properties of thermoplastic starch (TPS) films from waxy, normal, and high-amylose maize were investigated. Starch structural variations were obtained through extrusion and hydrothermal treatment (HTT). The molecular and crystalline structures were characterized using size-exclusion chromatography and X-ray diffractometry, respectively. TPS from high-amylose maize showed higher elongation at break and tensile strength than those from normal maize and waxy maize starches when processed with 40% plasticizer. Within the same amylose content, the mechanical properties were not affected by amylopectin molecular size or the crystallinity of TPS prior to HTT. This lack of correlation between the molecular size, crystallinity and mechanical properties may be due to the dominant effect of the plasticizer on the mechanical properties. Further crystallization of normal maize TPS by HTT increased the tensile strength and Young's modulus, while decreasing the elongation at break. The results suggest that the crystallinity from the remaining ungelatinized starch granules has less significant effect on the mechanical properties than that resulting from starch recrystallization, possibly due to a stronger network from leached-out amylose surrounding the remaining starch granules.
| Item Type: | Journal Article | ||||||
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| Subjects: | T Technology > TP Chemical technology | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
| Library of Congress Subject Headings (LCSH): | Thermoplastics, Starch | ||||||
| Journal or Publication Title: | Carbohydrate Polymers | ||||||
| Publisher: | Pergamon Press | ||||||
| ISSN: | 0144-8617 | ||||||
| Official Date: | March 2015 | ||||||
| Dates: |
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| Volume: | 117 | ||||||
| Page Range: | pp. 262-270 | ||||||
| DOI: | 10.1016/j.carbpol.2014.09.036 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 11 March 2019 | ||||||
| Date of first compliant Open Access: | 11 March 2019 | ||||||
| RIOXX Funder/Project Grant: |
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