Sisal nanofibril reinforced polypropylene/polystyrene blends: Morphology, mechanical, dynamic mechanical and water transmission studies

K, Asha Krishnan; Jose, Cintil; R, Rohith K.; George, K. E.

doi:10.1016/j.indcrop.2015.03.076

Cited by 46 publications

(28 citation statements)

References 51 publications

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“…This minor enthalpy change is attributed to desorption of moisture as water trapped in the polysaccharide structure is released. The DSC profile of cellulose B shows an endothermic peak at 250˝C due to non-cellulosic constituents such as hemicellulose [13]. As the temperature increases further, the DSC profile for all cellulose samples shows an endothermic peak at around 350-360˝C.…”

Section: Fourier Transform Infrared Spectroscopy Studiesmentioning

confidence: 98%

“…Sago cellulose and CMSC samples were analyzed using Bruker Avance 300 (7.05 Tesla magnet) and Bruker Avance III 900 US2 Ultra-High Field NMR magnet system (Bruker, Billerica, MA, USA) (14.1 Tesla magnet) with a 5 mm CPTCI 1 H-13 C/ 15 N/D. The 1 H NMR analysis was carried out at 600 MHz whereas 13 C spectra were recorded at 150 MHz.…”

Section: Characterization Of Cellulose and Cmscmentioning

confidence: 99%

“…(ii) (iii) For cellulosic carbon (Figure 6Bi), the 13 C-NMR spectrum Figure 6Bii illustrates six singlets corresponding to 13 C chemical shifts of cellulose carbons, C1 (105 ppm), C4 (83-97 ppm), C2/C3/C5 (72-80 ppm), and C6 (62-69 ppm) of the anhydroglucose units of cellulose [54]. To determine the cellulose crystallinity, C4 resonance region is most likely to be used [55].…”

Section: Degree Of Substitution (Ds)mentioning

confidence: 99%

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Optimizing Extraction of Cellulose and Synthesizing Pharmaceutical Grade Carboxymethyl Sago Cellulose from Malaysian Sago Pulp

et al. 2016

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Abstract:Sago biomass is an agro-industrial waste produced in large quantities, mainly in the Asia-Pacific region and in particular South-East Asia. This work focuses on using sago biomass to obtain cellulose as the raw material, through chemical processing using acid hydrolysis, alkaline extraction, chlorination and bleaching, finally converting the material to pharmaceutical grade carboxymethyl sago cellulose (CMSC) by carboxymethylation. The cellulose was evaluated using Thermogravimetric Analysis (TGA), Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Field Emission Scanning Electronic Microscopy (FESEM). The extracted cellulose was analyzed for cellulose composition, and subsequently modified to CMSC with a degree of substitution (DS) 0.6 by typical carboxymethylation reactions. X-ray diffraction analysis indicated that the crystallinity of the sago cellulose was reduced after carboxymethylation. FTIR and NMR studies indicate that the hydroxyl groups of the cellulose fibers were etherified through carboxymethylation to produce CMSC. Further characterization of the cellulose and CMSC were performed using FESEM and DSC. The purity of CMSC was analyzed according to the American Society for Testing and Materials (ASTM) International standards. In this case, acid and alkaline treatments coupled with high-pressure defibrillation were found to be effective in depolymerization and defibrillation of the cellulose fibers. The synthesized CMSC also shows no toxicity in the cell line studies and could be exploited as a pharmaceutical excipient.

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Section: Fourier Transform Infrared Spectroscopy Studiesmentioning

confidence: 98%

Section: Characterization Of Cellulose and Cmscmentioning

confidence: 99%

Section: Degree Of Substitution (Ds)mentioning

confidence: 99%

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Optimizing Extraction of Cellulose and Synthesizing Pharmaceutical Grade Carboxymethyl Sago Cellulose from Malaysian Sago Pulp

et al. 2016

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“…However, the use of natural fibers at nanoscale, improves the hydrogel mechanical properties due to they act as matrix reinforcement (Aouada, de Moura, Orts & Mattoso, 2011;Guilherme et al, 2015;Krishnan K, Jose, K. R & George, 2015;Missoum, Belgacem & Bras, 2013) without affecting the swelling ability (Rodrigues et al, 2013). In fact, the nanofibers have allowed to improve the swelling ability due to the capacity of forming hydrogen bridges, elasticity and available natural fiber surface (Nitta et al, 2015;Zhou et al, 2013;Spagnol, Rodrigues, Pereira et al, 2012)the XRD pattern indicated that the nanofibrils crystallinity was as high as 90%.…”

Section: Nanofibers In Hydrogelsmentioning

confidence: 99%

Natural fibers for hydrogels production and their applications in agriculture

Serna-Cock¹,

Guancha-Chalapud²

2017

Acta Agron.

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This paper presents a review on hydrogels applied to agriculture emphasizing on the use of natural fibers. The objectives were to examine, trends in research addressed to identify natural fibers used in hydrogels development and methods for modifying natural fibers, understand factors which determine the water retention capacity of a hydrogel. Consequently, this paper shows some methodologies used to evaluate the hydrogels efficiency and to collect in tables, relevant information in relation to methods of natural fibers modification and hydrogel synthesis. It was found that previous research focused on hydrogels development processed with biodegradable polymers such as starch, chitosan and modified natural fibers, cross-linked with potassium acrylate and acrylamide, respectively. In addition, current researches aimed to obtaining hydrogels with improved properties, which have allowed a resistance to climatic variations and soil physicochemical changes, such as pH, presence of salts, temperature and composition. In fact, natural fibers such as sugarcane, agave fiber and kapok fiber, modified with maleic anhydride, are an alternative to obtain hydrogels due to an increasing of mechanical properties and chemically active sites. However, the use of natural nanofibers in hydrogels, has been a successful proposal to improve hydrogels mechanical and swelling properties, since they give to material an elasticity and rigidity properties. A hydrogel efficiency applied to soil, is measured throughout properties as swellability, mechanical strength, and soil water retention. It was concluded that hydrogels, are an alternative to the current needs for the agricultural sector.Key words: Hydrogels, methods of modifying fiber, nanofibers, superabsorbent, water retention capacity. ResumenEn el presente artículo se presenta una revisión de literatura sobre hidrogeles aplicados a la agricultura, haciéndose mayor énfasis en el uso de fibras vegetales. Los objetivos fueron examinar las tendencias en la investigación, identificar las fibras naturales utilizadas en el desarrollo de hidrogeles, mostrar los métodos de modificación de fibras naturales para la elaboración de hidrogeles, entender los factores que determinan la capacidad de retención de agua de un hidrogel, mostrar algunas metodologías empleadas para evaluar la eficiencia de un hidrogel y recopilar en tablas, información relevante en relación a métodos de modificación de fibras naturales y de síntesis de hidrogeles. Se encontró que las investigaciones se orientan al desarrollo de hidrogeles elaborados a bases de polímeros biodegradables como almidón, quitosano y fibras vegetales modificadas, entrecruzadas con acrilato de potasio y acrilamida. Además, las investigaciones apuntan a la obtención de hidrogeles con propiedades mejoradas, que permitan resistir las variaciones climáticas y los cambios fisicoquímicos del suelo como el pH, la presencia de sales, temperatura y composición. Fibras naturales como caña de azúcar, fibra de agave y fibra de kapoc, modificadas con ...

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“…al. [8] investigated the effect of cellulose nanofibers on the mechanical and morphological properties of polypropylene/polystyrene blend.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characteristics of Polystyrene/Attapulgite Composites Via In-siu Suspension Polymerization

Wang

2016

MATEC Web Conf.

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Abstract.A series of polystyrene/attapulgite composites were synthesized through suspension polymerization. The composites were characterized by Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray diffraction. FTIR results show that there was no significant change in the peak positions and the peak intensity for polystyrene/attapulgite composites compared to the pure polystyrene. There is a rise in thermal stability of composites compared to pure polystyrene. Attapulgite acts as an effective thermal barrier and thereby hinders the degradtion of polystyrene.

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Sisal nanofibril reinforced polypropylene/polystyrene blends: Morphology, mechanical, dynamic mechanical and water transmission studies

Cited by 46 publications

References 51 publications

Optimizing Extraction of Cellulose and Synthesizing Pharmaceutical Grade Carboxymethyl Sago Cellulose from Malaysian Sago Pulp

Optimizing Extraction of Cellulose and Synthesizing Pharmaceutical Grade Carboxymethyl Sago Cellulose from Malaysian Sago Pulp

Natural fibers for hydrogels production and their applications in agriculture

Preparation and Characteristics of Polystyrene/Attapulgite Composites Via In-siu Suspension Polymerization

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