Toughening mechanisms in interfacially modified HDPE/thermoplastic starch blends

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DOIResolve DOI: http://doi.org/10.1016/j.carbpol.2014.07.073
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TypeArticle
Journal titleCarbohydrate Polymers
ISSN0144-8617
Volume114
Pages222229; # of pages: 8
SubjectStarch; Glycerol; Toughness; Blends; Compatibilization
AbstractThe mechanical behavior of polymer blends containing 80 wt% of HDPE and 20 wt% of TPS and compatibilized with HDPE-g-MA grafted copolymer was investigated. Unmodified HDPE/TPS blends exhibit high fracture resistance, however, the interfacial modification of those blends by addition of HDPE-g-MA leads to a dramatic drop in fracture resistance. The compatibilization of HDPE/TPS blends increases the surface area of TPS particles by decreasing their size. It was postulated that the addition of HDPE-g-MA induces a reaction between maleic anhydride and hydroxyl groups of the glycerol leading to a decrease of the glycerol content in the TPS phase. This phenomenon increases the stiffness of the modified TPS particles and stiffer TPS particles leading to an important reduction in toughness and plastic deformation, as measured by the EWF method. It is shown that the main toughening mechanism in HDPE/TPS blends is shear-yielding. This article demonstrates that stiff, low diameter TPS particles reduce shear band formation and consequently decrease the resistance to crack propagation.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21272616
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Record identifierb56a434d-9b98-4964-95b8-d2b0a07bb99a
Record created2014-12-03
Record modified2016-05-09
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