Properties and Biodegradation Nature of Thermoplastic Starch

Saiah, Redouan; Gattin, Richard; Sreekumar, P.A.

doi:10.5772/35348

Cited by 9 publications

(5 citation statements)

References 53 publications

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“…A higher content of plasticizers may result in two glass transitions, indicating the presence of two separate phases with different plasticizer concentrations (Mezger, 2014, p. 196). In the specific case of TPS plasticized with glycerol in combination with water, the two observed maxima were assigned to the "glycerol-rich phase" (below 0 • C) and the "starch-rich phase" (also "amylopectin-rich phase" or "glycerol-poor phase"; above 0 • C); their exact location and intensity depends on the preparation protocol (Viguie et al, 2007;Bertolini, 2010;Saiah et al, 2012;Balakrishnan et al, 2017;Sessini et al, 2018). It is worth noting that DMTA analysis turned out to be a more sensitive tool for T g detection than the DSC method, which was used in our previous work on analogous systems, where DSC was able to detect the "glycerol-rich phase" glass transition but not the "starch-rich phase" glass transition.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Starch-based materials are attractive due to their biodegradability and wide range of applications, such as packaging, coating, agriculture, medicine, pharmacy, or even optoelectronics (Sarka et al, 2011(Sarka et al, , 2012Saiah et al, 2012;Xie et al, 2013;Ghavimi et al, 2015;Oleyaei et al, 2016a;Campos-Requena et al, 2017;Dufresne and Castano, 2017;Javanbakht and Namazi, 2017;Kuswandi, 2017;Liu G. et al, 2017;Liu S. et al, 2017;Sarka and Dvoracek, 2017, Ilyas et al, 2018, Ilyas et al, 2019. However, the melting temperature of native starch is higher than its degradation temperature.…”

Section: Introductionmentioning

confidence: 99%

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Thermoplastic Starch Composites With Titanium Dioxide and Vancomycin Antibiotic: Preparation, Morphology, Thermomechanical Properties, and Antimicrobial Susceptibility Testing

et al. 2020

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Biodegradable composites of thermoplastic starch (TPS), titanium dioxide particles (TiO 2 ; average size 0.2 µm), and/or antibiotic (ATB; vancomycin) were prepared. Light and electron microscopy demonstrated that our recently developed, two-step preparation procedure yielded highly homogeneous TPS matrix with well-dispersed TiO 2 particles even for high filler concentrations (up to 20%). Oscillatory shear rheometry showed an increase in viscosity of TPS after addition of TiO 2 and ATB (from ca 2 × 10 5 Pa·s to ca 1 × 10 6 Pa·s at 1 rad/s and 120 • C). However, the high viscosity of TPS/TiO 2 /ATB composites did not prevent reproducible preparation of the composites by melt-mixing. Dynamic mechanical analysis proved a significant increase in shear moduli (storage, loss and complex modulus) of TPS after addition of TiO 2 and ATB (storage modulus increased from ca 25 MPa to more than 600 MPa at 1.33 rad/s at room temperature). Both rheological and mechanical properties indicated strong interactions among TPS matrix, filler, and antibiotics. The final TPS composites were soft enough to be cut with a sharp blade at room temperature, the TPS matrix was fully biodegradable, the TiO 2 filler was biocompatible, and the ATB could be released locally during the matrix degradation. Selected samples were tested for bacterial susceptibility using standard tube dilution test and disk diffusion test. The results proved that the ATB retained its bacteriostatic properties after the thermal processing of the composites. Therefore, the prepared TPS/TiO 2 /ATB composites represent a promising material for biomedical applications related to the local release of antibiotics.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermoplastic Starch Composites With Titanium Dioxide and Vancomycin Antibiotic: Preparation, Morphology, Thermomechanical Properties, and Antimicrobial Susceptibility Testing

et al. 2020

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“…In this sense, starch qualifies as a good option because of its world-wide availability, low cost, functionality and biodegradability. In order to evaluate biodegradable character of materials based on these polymers, several techniques were studied being composting, one of the most used (Saiah, Gattin, & Sreekumar, 2012). Naturally, starch is not considered as a thermoplastic polymer but its processing, in the presence of plasticizers, under high temperature and shear stresses, allows the disruption of its granular structure, becoming into thermoplastic starch (TPS) (Ma, Chang, Yu, & Stumborg, 2009;Pinto, Carbajal, Wypych, Ramos, & Satyanarayana, 2009).…”

Section: Introductionmentioning

confidence: 98%

Thermoplastic starch/talc bionanocomposites. Influence of particle morphology on final properties

et al. 2015

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“…Starch is one of the cheapest and the most abundant natural polymers. On this account, starch-based materials are employed in many applications, for example, in household, agriculture, textile, pharmacy, or medicine (Bertolini, 2010;Sarka et al, 2011Sarka et al, , 2012Saiah et al, 2012;Xie et al, 2013;Ghavimi et al, 2015;Campos-Requena et al, 2017;Javanbakht and Namazi, 2017;Kuswandi, 2017;Liu et al, 2017a,b). However, the biggest drawback of native granular starch is processing.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Starch Composites Filled With Isometric and Elongated TiO2-Based Nanoparticles

et al. 2019

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Biodegradable thermoplastic starch (TPS) composites with isometric titanium dioxide nanoparticles (TiO 2 ; diameter ∼100 nm) and elongated titanate nanotubes (TiNT; diameter ∼20 nm and aspect ratio >50) were prepared from wheat and tapioca starch. The preparation was based on our recently developed two-step procedure consisting of the solution casting (SC) followed by the melt mixing (MM), which had been shown to yield highly homogeneous TPS in our previous study. In this work we demonstrated that the type of the TPS matrix and the type of the filler had significant impact on the morphology and the properties of the final composites. Multiple microscopic techniques (LM, SEM, and TEM) evidenced that the TPS/TiO 2 composites exhibited a very homogeneous dispersion of the filler, while the TPS/TiNT composites contained micrometer-size agglomerates of TiNT. Moreover, all composites with the wheat starch matrix [TPS(w)] showed a higher filler agglomeration than the corresponding composites with the tapioca starch matrix [TPS(t)]. Rheological experiments showed that the TiO 2 and TiNT fillers had quite small impact on the viscosity of the TPS(w) matrix, probably due to slightly higher agglomeration, poorer dispersion, and weaker matrix-particle interactions. On the other hand, the TPS(t) matrix was influenced by both fillers significantly: the TiO 2 nanoparticles with almost ideal dispersion formed a physical network in the TPS(t) matrix, which significantly increased the viscosity of the composite, whereas the TiNT nanotubes seemed to destruct the TPS(t) matrix partially, resulting in decreased viscosity of the composite. DMTA results confirmed the rheological measurements: Storage moduli (G') showed that TPS(t) and its composites with TiO 2 were stiffer than the corresponding TPS(w) samples, while the TPS(t)/TiNT composites were less stiff than TPS(w)/TiNT. Also loss moduli (G") confirmed the difference between tapioca starch and wheat starch composites, which differed by their glass transition temperatures [T g of TPS(w) < T g of TPS(t)]. The rheological and DMTA results were supplemented and supported by IR, XRD, and TGA measurements.

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Properties and Biodegradation Nature of Thermoplastic Starch

Cited by 9 publications

References 53 publications

Thermoplastic Starch Composites With Titanium Dioxide and Vancomycin Antibiotic: Preparation, Morphology, Thermomechanical Properties, and Antimicrobial Susceptibility Testing

Thermoplastic Starch Composites With Titanium Dioxide and Vancomycin Antibiotic: Preparation, Morphology, Thermomechanical Properties, and Antimicrobial Susceptibility Testing

Thermoplastic starch/talc bionanocomposites. Influence of particle morphology on final properties

Thermoplastic Starch Composites Filled With Isometric and Elongated TiO2-Based Nanoparticles

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