Crosslinking starch/oat hull mixtures for use in composites with PLA

Peixoto, Thamires da Silva; Yamashita, Fábio; Bilck, Ana Paula; Carvalho, Gizilene Maria de; Grossmann, Maria Victória Eiras

doi:10.1590/0104-1428.02519

Cited by 9 publications

(8 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal stability of both BTM‐CONT and BTM‐TAN were similar, reinforcing the FT‐IR data which suggested that addition of 1% tannin did not induce significant physicochemical changes in the BTM blends. An initial weight loss of ~2%–5% in both samples were observed below 200°C, which can be associated with the moisture and volatile compounds evaporation as reported early 39,42–44 …”

Section: Resultssupporting

confidence: 64%

“…An initial weight loss of $2%-5% in both samples were observed below 200 C, which can be associated with the moisture and volatile compounds evaporation as reported early. 39,[42][43][44] Before exposition to biodegradation, the thermal degradation of BTM occurred in two steps, with a smooth degradation peak at 240 C corresponding to a weight loss of around 15% and a strong degradation peak at 357 C with about 80% of weight loss. Conversely, materials submitted to the biodegradation process for 30 or 60 days showed only one thermal degradation step near 360 C, with weight losses around 85% (Figure 4a).…”

Section: Tga and Xrdmentioning

confidence: 99%

See 1 more Smart Citation

Tannin improves the processability and delays the biodegradability of poly (lactic acid)‐starch‐based thermoset materials produced by injection molding made with renewable compounds

Moreira

Carvalho

Bilck

et al. 2023

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The incorporation of tannin in bio-composite biodegradable thermoset materials (BTM) based on poly (lactic acid), starch, sugarcane fiber, and nutrient compounds, to achieve an alternative material for conventional plastics processed by injection molding aiming environmental applications was investigated. The biodegradation of injection molded BTM dog-bone shape specimens prepared with and without incorporation of 1% tannin extract was evaluated up to 60 days with overall characterization by scanning electron microscopy, Fourier transform-infrared spectroscopy, thermogravimetric analyzer, and X-ray diffraction. The BTM produced with 1% tannin showed reduced molding defects with an increased productivity of up to 82%, improved mechanical properties and reduced biodegradation of samples buried in an organic substrate. Based on physicochemical characterization, the observed delay in biodegradation of BTM induced by tannin is suggested to result from its tight interaction with the starch and lignocellulosic fibers, acting as antimicrobial agent and reducing the hydrophilicity of blends. Natural polyphenols such as tannins are suitable additives to improve the processability of injection molded bio-composites and to extend the lifetime of biodegradable materials subjected to contact with high microbial load substrates, such as pots and buckets used to grow plants.

show abstract

Section: Resultssupporting

confidence: 64%

Section: Tga and Xrdmentioning

confidence: 99%

Tannin improves the processability and delays the biodegradability of poly (lactic acid)‐starch‐based thermoset materials produced by injection molding made with renewable compounds

Moreira

Carvalho

Bilck

et al. 2023

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Traditionally, crosslinking is promoted in batches, by conventional processes, demanding long reaction times and several steps. At the same time, there are several successful examples of starch crosslinking using STMP via reactive extrusion, 22,23,24 with the advantage of being a continuous, extremely fast, and more efficient process. Manoi and Rizvi 17 and Seker and Hanna 25 observed decreases in the water solubility promoted by crosslinking of starch with STMP by reactive extrusion.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels of starch/carboxymethyl cellulose crosslinked with sodium trimetaphosphate via reactive extrusion

Cagnin

Simões

Yamashita

et al. 2020

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Hydrogels are materials with advantages in specific applications, such as, retention of food active compounds. This work aims to develop starch (S)/carboxymethyl cellulose (CMC) hydrogels with porous structure, using reactive extrusion to promote crosslinking with sodium trimetaphosphate (STMP). The expansion, porosity, degree of substitution, gel fraction, swelling properties, and FTIR are studied, comparing S, S/CMC, S/STMP, and S/CMC/STMP formulations. Samples containing STMP present the same degree of substitution (0.050 ± 0.001). Higher porosity and percentage of open pores are observed in the mixed hydrogel (S/CMC/STMP). Crosslinking increase the swelling capacity at pH 7, and this property, just like the gel fraction, are sensitive to pH variations. The hydrogel S/CMC present the highest swelling rate compared with the other samples, suggesting strong interaction between components. The reactive extrusion process is efficient to produce starch and starch/CMC hydrogels crosslinked with STMP and the overall results demonstrate the advantages of the mixed hydrogel.

show abstract

“…The raw starch‐psyllium mixture’s SEM images showed that the psyllium has a larger surface area (Figure 5l). The starch‐cellulose mixture showed that the fibres were poorly inserted into the matrix due to the poor interaction (Figure 5k; Peixoto et al ., 2019). Both cooked samples with added fibres showed voids and fissures but with a larger number of pulled‐out fibres in the case of cellulose‐added samples compared to the cooked starch‐psyllium mixtures indicating a better adhesion between psyllium fibre and the matrix (Gironès et al ., 2012).…”

Section: Resultsmentioning

confidence: 99%

Effects of psyllium and cellulose fibres on thermal, structural, and in vitro digestion behaviour of wheat starch

Atac

Şensoy

2021

Int J of Food Sci Tech

View full text Add to dashboard Cite

The study investigated the effects of adding different types of fibre (psyllium and cellulose) on in vitro digestion behaviour of wheat starch with its thermal and structural properties. Psyllium and cellulose fibres interfered with the wheat starch differently. Psyllium fibre hindered starch gelatinisation, restricted the loss of starch crystallinity, and decreased the accessibility of enzymes to starch. In contrast, cellulose fibre had no significant effect on gelatinisation and loss of crystallinity but limited the digestive enzyme mobility. The impact of psyllium was more pronounced than cellulose on reducing starch digestibility. Rapidly digestible starch fractions of the cooked starch reduced from between 57.90 AE 0.60-69.72 AE 0.46 (% in starch) to between 28.06 AE 0.36-46.34 AE 1.10 (% in starch) and 53.23 AE 0.36-66.71 AE 0.24 (% in starch) for psyllium and cellulose fibre, respectively. This information could be helpful to design foods containing starch with reduced digestibility for a healthy diet.

show abstract

Crosslinking starch/oat hull mixtures for use in composites with PLA

Cited by 9 publications

References 35 publications

Tannin improves the processability and delays the biodegradability of poly (lactic acid)‐starch‐based thermoset materials produced by injection molding made with renewable compounds

Tannin improves the processability and delays the biodegradability of poly (lactic acid)‐starch‐based thermoset materials produced by injection molding made with renewable compounds

Hydrogels of starch/carboxymethyl cellulose crosslinked with sodium trimetaphosphate via reactive extrusion

Effects of psyllium and cellulose fibres on thermal, structural, and in vitro digestion behaviour of wheat starch

Contact Info

Product

Resources

About