A comparative study on capability of emulsion models for predicting the viscoelastic behavior of ternary polymer blends with core-shell morphology

Javidi, Zeinab; Mohamadi, Mahboube; Nazockdast, Hossein

doi:10.1007/s00397-019-01184-6

Cited by 2 publications

(1 citation statement)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This gel-like behavior of TPS has been shown to be originated from the single helix crystalline regions and the physical entanglement of highmolecular weight polysaccharide molecules. [28][29][30][31][32][33][34] Della Valle et al reported significant differences in the rheological behavior of TPS samples with different botanical origins, which could be attributed to their molecular-scale features such as chain length and linearity, favoring the entanglement of the amorphous phase rather than strengthening the crystalline structure. [28] Gonzalez et al suggested that the variation of glycerol content did not affect the contribution of single-helix crystallinity to strengthening of elastic network of TPS, but rather merely plasticized the amorphous fraction of starch.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Effect of Citric Acid on Microstructure, Rheology, and Structural Recovery of Thermoplastic Potato Starch

2021

Self Cite

View full text Add to dashboard Cite

The main objective of the present work is to explore the role of citric acid (CA) on microstructural changes and their impact on the melt rheological behavior, mechanical performance, and shape recovery of thermoplastic starch (TPS). The results of frequency sweep test show a pronounced nonterminal storage modulus (G’) at lower frequencies (high melt elasticity) for TPS, which is found to be greatly reduced in favor of improving the processability through the addition of CA. This could be explained in terms of reduced disentanglements of amylopectin molecules, as a crucial parameter responsible for the 3D‐type interconnected microstructure of TPS, through catalyzing effect of CA on hydrolysis. The results of the temperature sweep test (cooling mode) show a pronounced liquid‐to‐solid transition at ∼136℃ for CA‐modified TPS. This transition could be attributed to the temperature‐driven significant strengthening of the formation of single helical amylose crystalline structure and/or the hydrogen bonds between hydrolyzed amylopectin chains at temperatures below 136℃. The results are found to be consistent with the results obtained from the tensile and DMTA experiments. As expected, the shape recovery of the CA‐modified TPS sample is lower than that of unmodified TPS because of the lower elastic stored energy (stiffness) in the presence of CA, which can be largely compensated by incorporating appropriate nanoparticles.

show abstract