2023
DOI: 10.1016/j.ijbiomac.2023.125478
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Thermoplastic starch/polyvinyl alcohol blends modification by citric acid–glycerol polyesters

Jennifer M. Castro,
Mercedes G. Montalbán,
Noelia Martínez-Pérez
et al.
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Cited by 15 publications
(7 citation statements)
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“…Additionally, citric acid can help reduce glycerol migration, maintain a high swelling, and promote better mechanical behavior. 40 , 55 , 56 These findings agree with the results of this research; thermal stability and mechanical properties were higher in the sample hydrogels than in the control hydrogels (without citric acid). Thus, the greater the amount of glycerol, the greater the mechanical forces increase; on the contrary, the thermal stability decreases due to the decrease in intermolecular forces.…”
Section: Resultssupporting
confidence: 91%
“…Additionally, citric acid can help reduce glycerol migration, maintain a high swelling, and promote better mechanical behavior. 40 , 55 , 56 These findings agree with the results of this research; thermal stability and mechanical properties were higher in the sample hydrogels than in the control hydrogels (without citric acid). Thus, the greater the amount of glycerol, the greater the mechanical forces increase; on the contrary, the thermal stability decreases due to the decrease in intermolecular forces.…”
Section: Resultssupporting
confidence: 91%
“…Also, this signal can be used to evaluate the interaction level between the matrix and reinforcer [ 54 ]. The onset of this curve shows a shift of the transition observed around −50 °C, which is attributed to the glycerol-rich-phase ( relaxation) [ 55 , 56 , 57 ]. As can be seen, the curve of SG04 and SG10 evidenced a shift in the valley at −15 °C.…”
Section: Resultsmentioning
confidence: 99%
“…Also, this signal can be used to evaluate the interaction level between the matrix and reinforcer [54]. The onset of this curve shows a shift of the transition observed around −50 • C, which is attributed to the glycerol-rich-phase (β relaxation) [55][56][57]. As can be seen, the curve of SG04 and SG10 evidenced a shift in the valley at −15 • C. From these results, a displacement in the peaks of the plasticizer-rich phase can be inferred from the GH interaction, which reflects (Tβ) [58].…”
Section: Dma Analysismentioning
confidence: 99%
“…A peak at δ 172 ppm related to COOR groups, as shown by the sig nals of Kβ1, indicated that more COOH is accessible in these conditions, as shown in Fig ure 7 [18,37]. [37]. The numbers in blue identify the carbon of glycerol that wa reacted.…”
Section: Polyester Structures By Nmr Analysismentioning
confidence: 88%
“…The excess glycerol forced the esterification of Kβ, and the signals of Eβ were higher than those of Eα, as illustrated in Figure 8. A peak at δ 172 ppm related to COOR groups, as shown by the signals of Kβ1, indicated that more COOH is accessible in these conditions, as shown in Figure 7 [18,37].…”
Section: Polyester Structures By Nmr Analysismentioning
confidence: 89%